By Nick Haile, Oregon Department of Forestry
Stand improvement and other forestry work is expensive. Participation in cost-share programs can reduce costs and provide technical assistance to landowners. Technical forestry knowledge and technical assistance for forest landowners in Jackson and Josephine County is available through Oregon Department of Forestry free of charge.
- Forest Management Plan Development
- Wildfire Preparedness & Defensible Space
- Forest Fragmentation
- Wildlife Habitat Improvement
- Timber Harvesting
- Invasive Plants & Insect Controls
- Forest Road Development
- Surface Water/Erosion Issues
- Planting & Reforestation
- Small Woodlands Contacts, etc.
Stewardship Forest Management Plan
Funds may be available through the Stewardship Plan Program for up to 75% of the cost of a consultant-written Stewardship Plan. This plan is tailored specifically to a landowner’s property to provide a long term big picture plan to achieve their goals and objectives. The typical out-of-pocket cost to the owner is $250-$500 depending on acreage. Management plans are extremely useful and are required for some other cost share programs. Landowners interested in cost share assistance for stewardship plans should contact ODF. For more information, contact Stewardship Forester Nick Haile 541 664 3328 (Southwest Oregon District-ODF).
ODF Bark Beetle Mitigation
For landowners interested in reducing susceptibility to bark beetle attacks there is 50% cost share for Bark Beetle Mitigation available. Funds for bark beetle mitigation are limited and should focus on prevention of bark beetles or mitigation of an ongoing outbreak. The activities include thinning of overstocked conifer stands and slash treatment. Areas adjacent to current bark beetle outbreaks or those in imminent threat will receive highest priority. Project specifications and technical assistance is available through the local ODF office. Contact Stewardship Forester Nick Haile 541 664 3328 (Southwest Oregon District-ODF).
FSA Emergency Forest Restoration Program
The Emergency Forest Restoration Program (EFRP) is available and can cover the costs of reseeding, site prep, reforestation, and slash treatment on burned or drought effected acres. For more information, contact the Farm Service Agency at 541 776 4276. SWO-ODF Cost Share & Incentive Programs
FSA Conservation Reserve Enhancement Program
For those interested in riparian management, restoration, streamside plantings and filter strips, the Conservation Reserve Enhancement Program (CREP) can help eligible properties. The program covers 75% of the cost of the planting as well as a rental payment for the acres enrolled in the program. For more information, contact the Farm Service Agency at 541 776 4276.
NRCS Environmental Quality Incentives Program
The Natural Resources Conservation Service (NRCS) administers a variety of conservation programs for forestland owners. The Environmental Quality Incentives Program (EQIP) offers cost share funding for a variety of practices to maintain healthy forest and upland watershed that could include site preparation, tree/shrub planting, thinning, pruning, slash treatment, fuel breaks, post-fire rehabilitation, and reforestation. A management plan is required to participate in this program, but can be cost-shared through EQIP as well. For more information, call the NRCS at 541 423 6175
Fuel Reduction & FIREWISE
Landowners seeking financial assistance for fuels reduction and creating defensible space around their homesites may be eligible for a rebate through the Oregon Department of Forestry or their local rural fire district. Generally, funds are available for the 1-acre homesite; in some cases, funds may be provided for non-commercial thinning and slash reduction beyond the 1-acre homesite. Those interested should contact the Department of Forestry prior to beginning work to arrange for a site visit. Availability of funds depends on the status of grants and may vary from area to area. Contact your local ODF office, Jackson County call 541 664 3328; Josephine County call 541 474 3152)
ODF has assistance through Title III funding for neighborhoods who are Firewise or are working to become Firewise. The Firewise Communities USA recognition program is designed to get landowners involved in modifying the home ignition zone to prevent loss of property during wildfires. The funding provides a coordinator to assist landowners with assessments and provide recommendations. There is also funding for a fuels reduction crew to perform vegetation management within the home ignition zone (up to 200 ft. from home site) for the purpose of fire hazard reduction. For information contact Contact your local ODF office, Jackson County call 541 664 3328; Josephine County call 541 474 3152)
Driving into the Collins Forest early last winter I glanced up into the canopy and saw a disheartening sight. A dozen large ponderosa pine trees had “bark shavings” and red foliage from top to bottom or tops that appeared to be dying. These were the familiar signs and symptoms of a bark beetle infestation. What to do? This unfortunate situation is one that many forest landowners are confronted with from time to time. The basic options are:
- Do nothing
- Cut down the trees and dispose of the material by burning or chipping
- Cut down the trees and remove them from the site
Each of these can be an appropriate response, depending on the situation. Is there a market for the wood? Will it pay its way out of the woods? How much volume is there – enough to interest a logger? Is there good access? Is the terrain steep? Is disposal of the material by burning or chipping feasible? Are there nearby dwellings or structures at risk from a falling beetle-killed tree? Are bark beetle larvae or adult beetles still present in the standing trees? What are the consequences of not removing the infested trees – or removing them? The answers to these questions will help determine which option is chosen.
In SW Oregon, the western pine beetle (WPB) and the ips beetle are the bark beetles of greatest concern for ponderosa pine. Mountain pine beetles and red turpentine beetles may also be present. Sometimes a single tree may host more than one species of bark beetle.
The western pine beetle infests ponderosa pine greater than 6” DBH, usually trees that are stressed from drought, root disease or other factors and/or are growing on overly dense sites. The foliage of infested trees turn light green, then yellow, then rusty brown and finally falls off. A tell-tale sign of WPB infestation is the “bark-shaved” look – caused by woodpeckers hunting for beetle larvae. The ips beetle attacks the tops of larger trees and smaller, pole-sized trees.
Do nothing? For some, this idea may appear heretical – an invitation for the problem to spread and grow worse. However, in many cases when the issue is discovered, the trees are already dead and the bark beetles are long gone. It can be difficult to tell if a tree still harbors bark beetle larvae. During the summer months, when there can be multiple generations of the WPB, the beetles often leave the tree before the foliage fades in color. If the tree turns color in winter, the beetles usually are still present.
Many recently killed trees will contain other beetle larvae – typically, those of wood borers. These insects are not tree killers but rather are the “clean-up crew” that initiate the process of wood decomposition.
Removal of trees no longer containing bark beetles does not provide a forest health benefit. Left standing, the trees will provide valuable wildlife habitat. Removal is warranted if there is a fuels concern or if they would damage something if they fell.
Cutting down beetle-killed trees is a common practice. If bark beetles are still present in the trees before they are felled, cutting down the tree won’t by itself prevent beetle emergence. Knocking off the bark, cutting up the tree and piling and burning it, or chipping it, are all ways of destroying bark beetle “habitat” and preventing beetle spread.
In our case, about half the trees had bark shavings, indicating WPB attack, and the other half had dead or dying tops, indicative of ips beetle attack. The trees were all in the 18” to 32” diameter range – nice large trees that we just hated to lose. However, they were growing along a driveway and a few were located near a large storage shed, so there was a definite hazard to consider. The trees started to fade in color in the late fall, and close examination of affected trees suggested that beetle larvae were still present inside at least some of the trees. Removal of the trees could then – in theory – prevent spread to adjacent ponderosa pine trees that we were concerned about.
But it was late January, only a month or two before beetle emergence, so we would have to act quickly. A rough tally suggested that the dozen trees totaled about 7,500 board feet – three loads on a self-loading log truck.
Which local mills wanted ponderosa pine trees? Not many, apparently. In fact, it appeared that basically no one was interested in ponderosa pine at that time. Finally, we secured a local logger who was skilled, conscientious and, fortunately, had a purchase order for ponderosa pine that was about to expire. The price was not great, however.
An additional complicating factor in this “sanitation-salvage” operation was the risk posed by generating fresh ponderosa pine slash. The ips bark beetle is known to infest fresh pine slash, generally material in the 3” – 10” diameter range that is generated from January through July. The beetle then emerges from the slash and may attack standing green trees. The risk is greatest in drought years.
We would remove the boles of the trees down to a 6” small end diameter and take the logs and any resident beetles to the mill. But what about all of the leftover material, the tree tops and large limbs that are 3” in diameter and larger? This turns out to be quite a volume of potential ips habitat. We dealt with this by including removal off-site of the leftover 3” – 10” material in the logging contract. Since this had no value, it was an additional cost.
In the end, the operation was completed by early March. We were very lucky to find someone who could do the work and had a market for the pine logs, and who was willing to do all the extra cleanup. We didn’t make any money – in fact, there was a relatively small net cost. But, we were able to salvage the logs, reduce the potential falling hazard, and reduce the risk of beetle spread to nearby trees. The fact that the trees were close together and access was easy made a big difference. Had the affected trees been on a remote, steep hillside, our approach would likely have been different.
A final note: Your best bet to reduce the threat of bark beetles is to maintain healthy, vigorous trees. That is usually accomplished by thinning to reduce stand densities. Sanitation/salvage of beetle-infested trees can play a role in specific situations, but is not a viable long term strategy for improving forest health.
Some great resources from the Oregon Department of Forestry:
Video-Bark Beetles in Pine
Fact sheet-Western pine beetle
Fact sheet-Ips beetle
Dr. Christine Buhl, Forest Entomologist with the Oregon Department of Forestry, will give a presentation on “Forest Bees” at the Jackson Josephine Small Woodlands Association on February 20th, 7pm. Christine is involved in the Oregon Bee Project and related efforts to better understand and improve pollinator habitat on forest lands.
The declining health of bee populations has been in the news lately, and no wonder since about 70% of the world’s 100 most important food crops are bee-pollinated. Oregon hosts more than 500 bee species, of which perhaps 300 species live in or use forest habitats. While most Oregon trees are wind-pollinated, many forest understory shrubs and flowers depend on bees and other pollinators to complete their life cycles. Forests also provide habitat for bees that pollinate agricultural crops. Until recently the role of forests as bee habitat has mostly been overlooked, but that is starting to change.
In general, forests provide two things for bees: nesting habitat, and floral resources (nectaries). Most bees nest in bare ground, but they are also found in stumps, old twigs, and even tree cavities, giving new meaning to the term “cavity nester”! This lovely infographic from the Oregon Bee Project provides some interesting examples of forest nesting habitat.
Many of our local shrubs and forb (wildflower) species provide abundant resources – nectar and/or pollen – for bees and a myriad of other pollinators such as butterflies, bats, hummingbirds, flies, and beetles. This publication provides a good introduction to native pollinator plants in the Klamath-Siskiyou region.
Currently there’s tremendous interest in the forestry world in the relationships between forest habitats and bees. But at this stage, surprisingly little is known about this topic. For example, a recent literature review in the Journal of Forestry by OSU’s Jim Rivers and others found only 14 papers across four countries that were relevant to pollinator use of managed forests.
One intriguing finding emerging from recent research is that disturbances such as fire and timber harvest may actually increase the abundance and diversity of wild bees. For example, a study after the Douglas Complex fires in southern Douglas County found 20 times the number bees and 11 times the number of bees species for the most severely burned sites compared to the least severely burned sites. Another study in NW Oregon found increased bee abundance and diversity following intensive biomass removal on a site after timber harvest. Recently disturbed sites often have exposed, bare ground suitable for nesting, woody nesting materials and open conditions favorable for growth of understory forage plants, both shrubs and forbs, so it makes sense that these sites would be good for bees. However, much remains to be learned about the relationships between forest management and bee populations.
Southern Oregon contains a diverse mix of closed and open conifer-dominated forests, mixed evergreen forests, oak woodlands, chaparral, and other vegetation types, often occurring in a patchy matrix with lots of “edge habitat” (where two or more habitat types meet). This should make for good bee habitat, but to my knowledge, there’s been little study of local forest-pollinator relationships.
On the new Collins Demonstration Forest, we’re hoping to sow a diverse pollinator seed mix in several areas as well as monitor local bee populations, to see what’s out there. If you’re interested in participating or finding out more, let me know. Meanwhile, join us for the Forest Bees presentation on Feb. 20.
A good place to start is the Oregon Bee Project’s Foresters page. Check here for pollinator forage plant lists and habitat guidelines.
I’d also recommend the OSU PolliNation Podcast interview with Dr. Jim Rivers, an OSU scientist who is engaged in research on bees in forests.
Note: The Collins Demonstration Forest was first announced in January 2019 but many have not heard much about it yet. Here’s the story and an update on current activities.
I’m thrilled to announce the creation of the new 167 acre Collins Demonstration Forest, thanks to an incredibly generous donation from Bill and Marion Collins to the OSU College of Forestry. Many local woodland owners know Bill and Marion and have visited their lovely property near Gold Hill. If you haven’t been there, this is a remarkably diverse woodland that contains many of the features of SW Oregon forests in a microcosm: Cool, productive Douglas-fir stands on north slopes and hot and dry pine and oak stands on south slopes. Seasonal creeks, lush riparian areas, oak savannah, ceanothus brushfields, large sugar pines – it’s a 167 acre tract that has a bit of everything. This includes lots of wildlife such as deer, foxes, quail, mountain lions and plenty of black bears. Oh yeah, and a bit of poison oak.
As Bill tells it, it all started with a visit to the Josephine County fair almost 40 years ago. Bill and Marion had purchased 160 acres on the Right Fork of Sardine Creek in 1969 and dabbled in ranching for a few years, without too much attention to the surrounding forestland. At the fair Bill met Extension Forester Allan Campbell and a local landowner and roadbuilder, Orville Camp. The idea of managing a woodland for fun and profit came into being. Bill hired Orville to build an extensive network of roads throughout the property, paid for by the timber harvested in the right of way. This provided access and allowed trees to be removed with a tractor and farmi winch without ever leaving the road.
With the help of pioneering woodland owner and manager John Sherck, Bill carefully tended his stands with an eye for improving forest health. Defective trees or those with poor growth were removed, and the healthiest and best growers were left. Some large trees with insect or disease problems, or that were growing poorly, were selectively removed. Logs were carefully merchandized, with a few loads going to the mill in most years and smaller material converted to posts and poles and firewood. Over time, this approach maintained what Bill calls an “all-aged, all species” forest with a steady stream of products, revenue, and forest benefits. He also took advantage of cost share programs and completed various non-commercial thinning and fuel hazard reduction projects which helped reduce the risk of high severity wildfire.
Today, the forest is healthy, diverse, and productive. Bill and Marion’s sustained and careful stewardship has been recognized with a Jackson County Tree Farmer of the Year award and a John Black Lifetime Achievement award.
To be sure, there are challenges. Several years of drought have increased populations of bark beetles and wood borers, and the steep ground poses difficulties for forest operations. High intensity wildfire is an ever-present threat. But it’s the same for most forest properties in this region.
About 18 months ago, Bill and Marion approached me with the idea of donating the property to OSU for the benefit of the local Forestry and Natural Resource Extension program. Needless to say, I was extremely excited! I have seen how much demonstration forests have benefitted other local Extension programs. These are sites for real world, hands-on education via classes, tours, demonstrations, and applied research. And in many ways this would be a continuation of what was already happening at the Collins forest, as Bill and Marion have hosted countless tours and classes there over the years.
Going from an idea to execution proved to be lengthy and sometimes challenging process. As Bill said, “I never knew it was so hard to give stuff away!”
The property is now part of the OSU Research Forest system. The intent is to hold on to and manage it as a working forest, much as OSU has done with the Obertueffer tract in eastern Oregon for more than 20 years and counting. I’ll be actively involved in management, in collaboration with OSU Research Forest staff.
To date we have installed 50 permanent plots to monitor forest conditions and have updated the forest management plan. A bark beetle infestation demanded immediate attention last winter (see this article). Road maintenance and thinning projects are on-going. We’ve had high school students out collecting data as part of our Student Watershed Assessment Teams (SWAT) program. I’m excited about establishing some pollinator plantings and monitoring use of the forest by native bees, and planting some blister rust-resistant sugar pine. I expect there will be many opportunities down the road for active involvement in projects by volunteers, ranging from students to woodland owners.
My hope is that this Demonstration Forest will be a resource for the whole SW Oregon woodland owner community. Stay tuned for updates and opportunities to get involved.
What have we seen? Trends 1895-present
Simply put, it’s gotten warmer in the Rogue valley over the past 100+ years. Since 1895 the average temperature has increased by 2.6 F in Ashland and 4.3 F in Grants Pass (see figure below). Medford average temperatures have likewise increased, with the biggest gains occurring since the 1980s.
What about precipitation? Again, there is a lot of year to year variation, but in this case there is no real upward or downward trend. We have seen major droughts, such as in the 1930s and 1980s, as well as individual very wet and very dry years and longer periods of wetter and cooler climate. At least some of this variability can be attributed to phenomena like El Nino and the Pacific Decadal Oscillation.
Old timers in the Rogue Valley talk about days of heavy snows in the valley and those aren’t simply romantic memories. In the early 1900s, Medford averaged 9” of snowfall annually; not much, but with occasional storms dumping a foot or more. Since the 1980s there have been few such large storms and the annual average has decreased to under 4”. Crater Lake snowfall shows huge annual variations but the overall trend has been downward since the 1930s.
So, in sum: it’s gotten warmer, there hasn’t been much change in rainfall, and snowfall has decreased. Of course, these changes in average values can be hard to discern, because there is so much variability.
If you want to take a look at the data yourself, the University of Washington has a great online tool that allows you to look at temperature and precipitation trends over the past 100 or so years at weather stations all around the northwest. Curious about temperatures in Prospect, or rainfall in Brookings? Snowfall in Bend or Baker? This tool shows a chart of the year to year data and the overall trend. I had a lot of fun playing with it.
What does the future hold?
Probably more of the same: hotter, less snow, not much change in overall precipitation. Average temperatures are predicted to increase 5-9 F by 2100 in the Rogue Valley, depending on the level of greenhouse gas emissions and other factors. Right now we’re on track to hit the higher end of that prediction. So what does that mean? A climate a lot more like Redding’s, according to Phil Mote, Director of the Oregon Climate Service. 2015 is on track to be the warmest year ever in the Rogue Valley (and worldwide, for that matter). And this year will be more like norm in the future.
Another way to look at it is to consider how temperature changes with elevation. Typically for every 1,000 foot gain or loss in elevation we see a 3.5 F change in temperature. So a 7 degree increase (midway between a low and high prediction) is roughly equivalent to a 2,000 foot loss in elevation. Sites at 3,500 feet would have temperatures like those of the valley floor, all other things equal.
In terms of precipitation, Canada is expected to get wetter, according to Mote, and the SW will be drier. We’re in the middle, so predictions of precipitation are “a wash”, he said. Another speaker stated that the average of current models shows no big change in Rogue valley precipitation, but there may be more winter rainfall and less in the summer.
Snowfall is predicted to decrease, dramatically so at lower elevation sites. The average snow level will likely increase 1,000-2,000’ feet. 2015, with 11% of the historical average snowpack, may be a typical year several decades from now.
With less snow and earlier melt outs we’re looking at earlier peak flows and lower summer flows, resulting in higher stream temperatures and other water quality issues.
Increases in fire are an obvious concern. Fire season length is on an upward trend in the US west and that trend is likely to continue. In recent decades we’ve seen an increase in the acres burned and in fire severity in many areas of the US west (due to fuels buildups as well as climate); the predictions for the Rogue Basin are for a 300-400% increase in the area burned by 2100. It’s not good.
Higher temperatures and less summer rain also translate into increases in tree stress and potential losses to insects and abiotic diseases. We’ve seen a large uptick in tree mortality in SW Oregon recently with the dry and hot temperatures but this pales in comparison to the situation in California with its exceptional, extreme drought.
It’s a daunting picture, but there are plenty of things land managers can do to prepare for and adapt to climate changes. For forest owners, the good news is that many of the practices that lead to increased resistance to fire and insect attack, such as thinning, fuels reduction, and promoting drought resistant species, are also practices that will help with climate adaptation. For more information about forests, climate change, and woodland owner strategies, see the OSU Extension Climate and Forests blog.
For those of you using Google Earth in your day-to-day, the “pro” version is now available for free (previously $400/yr.). The pro version is very similar to the free version but allows for direct area measurements and also includes some other data layers such as property boundaries and county demographic data.
If you’re new to GE and want to try it, here’s a walk-through tutorial I use for my workshops. It hasn’t been updated yet to incorporate difference in the pro version but is still a good place to start.
Download GE Pro:
After the hard work developing Citizen’s Fire Academy, CFA coordinator Rhianna Simes has stepped down and newcomer Kara Baylog has taken on the challenge of continuing and growing this practical course in fire preparedness. Kara comes to OSU Extension and the Citizen’s Fire Academy from just over the state line in Siskiyou County, California, where she worked with the Shasta Valley Resource Conservation District in developing and running forestry and fire educational programs for landowners and the public.
Citizen’s Fire Academy Volunteer Robert Briggs brings together his neighbors and the local fire department to discuss how his community can work together and prepare for wildfire.
CFA volunteers from the 2014 program are out and about, engaging their neighborhoods and communities to educate people on how to improve fire resiliency on homes and properties and plug into local resources and fire-fighting agencies. CFA Volunteers serve as sparkplugs to motivate their communities into action.
Do you want to be a sparkplug in your community? Do you want to get informed on how to become more fire resilient and jump-start your neighborhood to prepare for fire season? Over the next couple of months, we will be gauging interest in bringing the program back in the future, perhaps in 2016. If you are interested in participating in the next round of engaging and informative classes, field trips, conversations and service, please contact Kara at 541-776-7371 ext 213 or Kara.Baylog@oregonstate.edu.
At the top of the list are Douglas-fir branch and top dieback and outright mortality, followed by an apparent outbreak of the fruit tree leafroller in oaks. But there is plenty of other action to go around, including bark beetles in pines and white fir, among others.
It’s mostly about the weather
In the big picture, many trees are likely still suffering from the effects of 2013, the driest year on record here in the Rogue Valley. Medford received 8.97 inches of precipitation over the year, less than half the average value. To put this figure into perspective, areas that average less than 10” of precipitation in eastern Oregon typically don’t support tree cover at all!
2013 was the driest on record in Medford
December 2013 was notable in having a few days of extremely cold temperatures, which killed some trees and shrubs outright, and injured others. Very cold temperatures can injure sapwood and impede water transport, and damage may not show up until later in the season when water needs increase with warmer temperatures.
In 2014, we had slightly above normal precipitation, but it was the warmest year on record in the Rogue Valley, in terms of average temperature. We also experienced the hottest summer on record. Warmer temperatures increased evapotranspiration from trees, which resulted in increased moisture stress, compounding the moisture deficit from 2013.
2014’s snowpack was about 50% of average in the Cascades, and this year of course was even worse. Thus, despite increased rainfall from last fall through this winter, we are still in the grips of a moderate to severe drought.
In a nutshell, it’s been very dry and hot over the past 2 years and many trees have been and continue to suffer from moisture stress. A chronic lack of water results in reduced growth and reduced production of defensive compounds that can ward off pests. That’s why drought-stressed trees are more vulnerable to “secondary” insects and diseases that wouldn’t affect more vigorous trees. Severe drought may also reduce tree water below critical levels, resulting in the death of branches or even whole trees. This ODF pest note does a great job of explaining the interactions of water stress and insects and diseases.
Given our stressed, vulnerable trees, which specific insect and disease pests are doing trees in? For Douglas-fir, the flatheaded fir borer is probably responsible killing many trees on marginal sites while various other insect pests may be responsible for branch dieback and top kill, especially on smaller, younger trees. The Phomopsis canker is also likely implicated in top kill and mortality of smaller trees.
Too many trees in the wrong places
Most people in the woodlands and forestry worlds are familiar with the notion that fire exclusion over 50-100+ years has likely resulted in greater density of trees on many sites, leading to increased competition and stress for a limited supply of soil moisture. That makes trees a lot less resilient to drought when it inevitably occurs.
Along with increased density is the probable encroachment of Douglas-fir on marginal, lower elevation sites where it was probably much less common historically. Pines and oaks often do better on these sites and Douglas-fir can really struggle.
Dead and dying Douglas-fir on the slopes of Johns Peak, just went of Central Point. Not a great DF site.
What to do?
The above-mentioned ODF pest note summarizes it well, and I quote from that document below (I’ve made a few additions):
Most tree damage occurs on disturbed sites and is due to a combination of factors including soil conditions, tree species, and weather patterns. It is unlikely that stress will be alleviated by simply altering a single factor. Rather, improvement will come from an accumulation of many moderate changes to relieve stress and increase vigor.
- Prevent soil compaction caused by vehicle or animal traffic near trees. Livestock can compact surface soils and damage fine roots, most of which lie within a foot of the soil surface . Clay soils are especially vulnerable.
- Avoid direct damage to trees and roots by grazing animals or by machinery.
- Reduce competing vegetation via thinning and brushing. Favor trees that are more drought resistant. The research is clear that thinning in pine stands can improve tree resistance to bark beetle attack. It’s less clear if the same if true for Douglas-fir and the flatheaded fir borer, but the basic principle of improving tree vigor to increase pest resistance still holds.
- Apply mulch to maintain soil moisture (1-3 inches is usually sufficient).
- Irrigate landscape trees during dry weather. Apply water slowly over many hours so it penetrates to tree roots or use drip irrigation lines.
- Do not alter drainage patterns (ditches, ponds, etc.) near established trees.
- Plant trees that are well suited for the site; use local seed sources and species that are adapted to your soil types. On sites where Douglas-fir mortality is occurring it may be advisable to plant ponderosa pine or hardwoods.
- If insect larvae or branch/stem cankers are evident, prune and destroy affected branches to reduce the spread of these agents.
What about the oaks?
Landowners have been calling in with reports about moth-eaten oak leaves and “dying trees.” The culprit has not yet been positively identified, but may be the fruit tree leafroller (Archips argyrospila). The larvae of this small moth feed in spring on new leaves, resulting in leaves that are distorted and ragged in appearance. Young leaves are rolled and tied with silk. There is one generation per year. If you are walking under oak trees you may run into small wiggling larvae dangling from threads. There have been reports from Jackson and Josephine County this year, so the problem appears widespread.
In outbreak years trees may appear partly or completed defoliated, resulting in fears that “My oaks are dying!”
However, as alarming as it may look, tree mortality seldom if ever occurs from this pest. If the pest turns out not to be the fruit tree leafroller, it is likely something similar, with similar effects.
Action needed: None. Birds and other natural enemies of the insect will deplete its population and the infestation will run its course. Trees will likely leaf out again. Those who absolutely must do something could spray BT but in addition to being expensive and logistically challenging, is very unlikely to dampen population levels with such a widespread outbreak.
Reference: PP 16-19 in “A Field Guide to Insects and Diseases of California Oaks.”
What will happen to these lands? Will they continue to be managed as working forests? Will the owners’ hard work and dedicated stewardship over many years be maintained? Or will the land be cutover, subdivided, and developed, or simply taken over by a new owner who neglects or takes poor care of the property? In a nutshell, this is the concern many owners have as they look to the future. And it’s a very real issue, given the challenges of passing land on intact to heirs, or devising a strategy that will help maintain past stewardship practices with a new set of owners.
OSU’s award-winning Ties to the Land program is designed to help families work through the challenges of passing the land on from one generation in the family to the next.
However, the reality is that some forest owners don’t have children or other heirs who are interested in, available, or capable of taking over their property. As stated by one local woodland owner, “Neither of our adult daughters are candidates to live and care for our timber property. At 70 and 71, our years are numbered as active caretakers, so we’d like to explore how feasible it is to find a younger couple/family who is interested …”
Recently, Marty Main and I convened a small group of woodland owners to discuss options for owners who want to maintain their property legacy, but don’t anticipate passing the land on to heirs. If this situation applies to you, you may be asking yourself some of these questions: Do I want to stay on it as long as I can or until my death, or am I ready to sell/transition now? Do I want to sell the land, or lease it, or donate it? What about a conservation easement? Where can I find owners who share my values and management approach? How can I provide an inheritance for my children or other heirs or beneficiaries, even if they aren’t willing or able to take over the property?
Since individual owner goals, needs and situations are so variable, there are no universal solutions, but we are starting to address some of these questions and brainstorm possible answers. If you are interested in learning more or participating, please contact:
OSU Extension Forestry and Natural Resources
(541) 776-7371 x221
Small Woodland Service, Inc.