By Margaret Bayne, OSU Extension Service Staff-retired, OSU Master Gardener

Are we going to see another “Heat Dome” this year? 
Hope not!…but be prepared!  Check out the resources below.

Brown leaves on a plant due to injury caused by a heatwave.
2021 Heatwave Damage – Kym Pokorny, Oregon State University

***Great Publication/book to add to your library: Abiotic Disorders of Landscape Plants; A Diagnostic Guide, Publication #3420, (University of California ANR) ISBN 1-879906-58-9.  Learn the difference between sunburn injury, sunscald injury, thermal/high temperature injury and high light injury.

Brown crinkled leaves of a blackberry plant and discolored, withered blackberries, all damage due to heatwave.
2021 Heatwave damage on blackberries
Bernadine Strik, Oregon State University

What Can We Learn from the ‘Pacific Northwest Heat Dome’ of 2021? (Nicole Bell, WSU) https://bit.ly/3MklELi

June 2021 heat impacts on trees explained. (Glen Ahrens, OSU) https://bit.ly/3sFx9oJ

What is a ‘heat dome’. (NOAA) https://bit.ly/3sFIhlx

How to care for heat-damaged plants. (Heather Stoven, OSU via Kym Pokorny, OSU) https://bit.ly/3PrUzrJ

Tips for gardening in extreme heat. (Erica Chernoh, OSU via Kym Pokorny, OSU) https://bit.ly/3Lh4TPP

Heat wave in the garden: how to identify and prevent heat stress in plants. (Nicole Sanchez, OSU) https://bit.ly/38yerZx

Environmental injury: Sunscald and Sunburn on Trees https://bit.ly/3wiAtbz

Rhododendron -Sunburn. PNW Disease Handbook https://bit.ly/3yEdwkX

Rhododendron -Leaf Scorch. PNW Disease Handbook https://bit.ly/38C6yCa

Brown leaf scorch on leaves of Rhododendron plant.
Leaf scorch on Rhododendron
Jay Pscheidt, Oregon State University

The Myth of Hot-Weather Watering “Watering plants on a hot sunny day will scorch their leaves”, (Dr. Linda Chalker-Scott, WSU) https://bit.ly/3wjNp0V

And/or search online:

1. Add “site:edu” to the search word or phrase, but omit the quotes.

2. If you search for sunburn, try “sunburn +plants site:edu” (omit the quote marks).  (Doing so will help limit the number of references to sunburned people!)

By Margaret Bayne, OSU Extension Service Staff-retired, OSU Master Gardener

Mycorrhizae! Myco-what?? (Jim Downer, Gardenprofessors.com) https://bit.ly/36h3XfU

Measuring the weather in your garden. (Linda Chalker-Scott, Gardenprofessors.com)https://bit.ly/3KSxWtF


Japanese Beetle information:

Illustration of Japanese Beetle with a red circle and a slash over the illustration.
Image: Oregon Department of Agriculture

Japanese Beetle Eradication project (Oregon Department of Agriculture)- Maps, look-a- likes, response plan, pesticide info, etc. https://bit.ly/3KPmqzk

Japanese Beetle PDX website: https://bit.ly/3rtu22N

Effective Management Remains Elusive for Beetle That Eats Almost Anything. (David Coyle, Entomologytoday.org) https://bit.ly/3OePjHd


Popup yard sprinklers spraying water on grass with ornamental flowers in the back ground.
Photo: Lynn Ketchum, Oregon State University

Publications and videos of ‘Gardening Lawn, and Landscape’ resources from OSU. https://bit.ly/3M7s3Jf

Peer Reviewed, free download publications from WSU:

Manage Water by Adjusting Lawn Sprinkler Run Time: Instructions for the Columbia Basin of Washington State. (Andrew McGuire, WSU) https://bit.ly/3OfW1fX

Growing Rhubarb in Home Gardens. (Linda Chalker-Scott, WSU https://bit.ly/3EleOSt

Environmental Injury: Sunscald and Sunburn on Trees. (Marianne Ophardt & Rita Hummel, WSU) https://bit.ly/3xtxxtV

Winter Burn on Evergreens. (Marianne Ophardt & Rita Hummel, WSU) https://bit.ly/3vjv8PD

Protecting Water Resources: Planting and Caring for Home Wetlands and Other Riparian Areas. (Linda Chalker-Scott, WSU) https://bit.ly/3xvukd7

The Efficacy and Environmental Consequences of Kelp-Based Garden Products. (Linda Chalker-Scott, WSU) https://bit.ly/3vh3lzo

By Margaret Bayne, OSU Extension Service Staff-retired, OSU Master Gardener

Western bumble bee on yellow flower
Western Bumblebee Photo: Stephen Ausmus, Agriculture Research Service, USDA

The ABCs of plants for Bees! (Abi Saeed, Gardenprofessors.com) https://bit.ly/3tiYmyx

Surfing the “green wave.”  Is it spring yet where you are? How can you tell? (Pam Knox, Gardenprofessors.org) https://bit.ly/3wbT9dy

An Introduction to growing under lights. (By Miri Talabac, UMD) https://bit.ly/3qaAnzo


VIDEOS from NPIC (National Pesticide Information Center, OSU)

Bacillus thuringiensis:   https://bit.ly/3Ji4EDT

Spinosad:  https://bit.ly/3CW6mIY

What does it mean when food is organic?:  https://bit.ly/3ivh2oB


Dorsal view of Giant Asian Hornet
Giant Asian Hornet, Oregon Department of Agriculture

How to make irresistible traps for Asian giant hornets using sex.  “Traps placed near nests in China attracted thousands of males.” (Erin Garcia de Jesús, Sciencenews.org) https://bit.ly/3MYPndF


Insects on a Plane: How Eusocial Ants, Bees, and Wasps Deal With Viruses. (Melissa Mayer, entomologytoday.org) https://bit.ly/3Jhfhqt


Mosquito on skin.
Mosquito, National Pesticide Information Center, OSU

Mosquitoes may be attracted to certain colours. (Cassandra Edmunds, theconversation.com) https://bit.ly/3wdbaIo

Hidden Diversity: When One Wasp Species is Actually 16. (Entomology today) https://bit.ly/3th6teR

By Margaret Bayne, OSU Extension Service Staff-retired, OSU Master Gardener

A Note from Margaret:  Please considering joining us for our twice-monthly Zoom meetings; the first and third Mondays, from 1-3 pm!

Tri-county Master Gardener STUDY GROUP

  • The MG Study Group is a self-organizing collection of seasoned and new MGs (and everything in between) who love to learn!
  • We serve all three counties via our Zoom meetings: Clackamas, Multnomah & Washington.
  • We meet twice a month to develop our skills in identifying and understanding insects, spiders, and plant diseases and disorders, etc.
  • Meetings are based on group participation.
  • All interested OSU MGs and interns are welcome. (We are not open to the general public)
  • Attendance is not required; join us when we can!
  • On first Mondays we generally conduct an informal show-and-tell session, where MGs share samples of insects, spiders, plants for identification and/or diagnosis by the group. This is a great deal of fun and no advance work is required except for collecting a sample. (If you don’t have a sample-no problem! Join us anyway).
  • The third Monday is a more formal session based on a Study Guide you receive about a week ahead.  Study Guides are developed voluntarily by attendees about subjects that are of interest to them and to share with the group.  Upcoming Study Guide session topics for 2022Bullies in the Garden-Invasive and Overly Enthusiastic Plants, Summer Heat Woes, Downy Mildew, Pruning, Blackberries, Best Garden Practices, and a Group Diagnostic practice.
Moss in lawn. Brain McDonald, OSU

VIDEO:  Managing Moss in Lawns. (Alex Kowalewski, OSU via youtube) https://bit.ly/3HVDhij

PUBLICATION: Managing Moss in Lawns in Western Oregon. (Brooke Edmunds, Alec Kowalewski, OSU) (View or download a pdf.) https://bit.ly/3LOd2Np

Practical Lawn Care for Western Oregon. (Doug Vonderberg, Alec Kowalewski, OSU) https://bit.ly/34Kd202

Great information about dogs and lawns: Dog Spots! No, not dalmatians but dead spots in the lawn. With the low rainfall and lack of irrigation pet owners may be seeing dog injury to their lawns. Urine damage can be mistaken for symptoms of several patch-type diseases. Samples of the dead grass placed in a plastic bag will release ammonia, which can be detected by smell. Other chemical injury such as fertilizer spills or salt spills can cause similar symptoms but do not release an ammonia odor. Female dogs are usually more damaging as they urinate on the ground, in the same spot and tend to empty their bladders more completely than males. And FYI, yes, this is research-based info!” (PNW Plant Disease Management on Facebook) More information: https://bit.ly/3GZbTPq

Spruce cones could scrub carbon emissions as effectively as costly chemicals.  A new material to capture carbon dioxide comes from a surprising green source: spruce cones.” (Prachi Patel, Anthropocenemagazine.org) https://bit.ly/33t3ciA

The world’s most unwanted plants help trees make more fruit. (Angela Nicoletti, Florida International University https://bit.ly/3gM38gL

Big leaf maple trees. Patrick Breen, OSU

Video & article: First-of-its-kind estimate of the total number of tree species. (Purdue University) https://bit.ly/3uTfU5u

The Gardens of Chernobyl 30 years after the disaster. (Jim Downer, gardenprofessors.com) https://bit.ly/3oRBPGj

Unearthly Plant Photos by Tom Leighton Highlight Nighttime Chemical Processes. (Anna Marks, thisiscolossal.com) https://bit.ly/365cMsH

Western Monarch Butterfly. Lynn Ketchum. OSU

Western monarch populations grew over 100-fold in 2021. Why?  The beloved butterflies had fallen to critical levels in recent years. Experts weigh in on what might be causing their remarkable return.” (Alissa Greenberg.pbs.org) https://to.pbs.org/3GMJdc1

More on this topic: How Little We Know About Monarchs… (Kathy Keatley Garvey, University of California) https://bit.ly/354AIMA

Discovery of ancient plant fossils in Washington points to paleobotanic mystery. (University of Kansas) https://bit.ly/3gMccSH

Just for fun!  Idaho Potato Commission Releases French Fry Scented Perfume. (newson6.com) https://bit.ly/36m2vsx

By Margaret Bayne, OSU Extension Service Staff-retired, OSU Master Gardener

Critters digging up your lawn and garden?  Here are some resources on voles, moles and gophers:

Pruning saw (upper left), a long‑handled pruning shears (center), and hand shears (bottom).
Pruning tools – OSU

Moles, voles and gophers dig the garden. (Dana Sanchez, OSU) https://bit.ly/33iM2Uu

Meadow Voles and Pocket Gophers: Management in Lawns, Gardens, and Croplands. (Gunn et al,
OSU) https://bit.ly/3zZYi8r

People and Plants-“…a look at the German botanist Adam Lonicer.” (Sylvia Thompson-Hacker, Gardenprofessors.com) https://bit.ly/3fiQs0k

VIDEO: Pruning Fruit Trees. (OSU Clackamas County MG, Clackamas County TV via Youtube) https://bit.ly/33wpEXt

In a New Study, Spring Forest Bees Get Their Due. (Leslie Mertz, Ph.D, Entomologytoday.org) https://bit.ly/3Grheil

Back-Seat Driver: The Parasite That Makes Bees Drop Off Its Babies. (Page Embry, Entomologytoday) https://bit.ly/3nky37w

Do Pollinators Prefer Dense Flower Patches? Sometimes Yes, Sometimes No. (Andrew Porterfield, Entomologytoday.org) https://bit.ly/3GDxDkx

Moss in lawn – OSU

VIDEO: Managing Moss in Lawns. (Alec Kowalewski, OSU) https://bit.ly/3I4mrO5

Where Giant Honey Bees Rest Their Wings During Annual Migration. (Ed Ricciuti, Entomologytoday.org) https://bit.ly/3GqcZ75

This Insect Has The Only Mechanical Gears Ever Found in Nature.  “The small hopping insect Issus coleoptratus uses toothed gears on its joints to precisely synchronize the kicks of its hind legs as it jumps forward.” (Joseph Stromberg, smithsonianmag.com) https://bit.ly/3qvaSJX

VIDEO: Watch roots from different plants compete for prime real estate underground.  Mathematical modeling and greenhouse studies show complex interactions keep roots productive. (Elizabeth Pennisi, Science.org) https://bit.ly/3GmNK5C

By Margaret Bayne, OSU Extension Service Staff-retired, OSU Master Gardener

Floribunda Rose ‘Mardi Gras, Oregon State University

Plant lists that shouldn’t exist. (Linda Chalker-Scott, WSU; gardenprofessors.com)
https://bit.ly/3oM7NEo

The contrarian rosarian–debunking rose mythology. (Jim Downer, U of CA; gardenprofessors.com)
https://bit.ly/3dH9KLI

Why insects are more sensitive than they seem. (Zaria Gorvett, BBC)
https://bbc.in/3oKm3xe

NEW PUBLICATION: A PNWBBA Guide to Habitat Management for Bumble Bees in the Pacific Northwest. (Downloadable PDF) (Rich Hatfield, Kurt Merg, and Joel Sauder, Xerces Society)
https://bit.ly/3GE2OeL

NEW PUBLICATION: The Pacific Northwest Bumble Bee Atlas: Summary and Species Accounts-A collaboration between the Xerces Society, Idaho Department of Fish and Game, and Washington Department of Fish and Wildlife. (Downloadable PDF) (Rich Hatfield, Leona Svancara, Leif Richardson, Joel Sauder, and Ann Potter; Xerces Society)
https://bit.ly/3GE7FNo

Honey bee in flight in front of honeycomb.
Honey bee. Photo: Lynn Ketchum © Oregon State University

Genetic Analysis Reveals the Origins of the World’s Most Common Honeybee Species.  “The western honeybee hailed from western Asia seven million years ago, ending the contentious debate over where these buzzy critters originated.” (Rasha Aridi, Smithsonianmag.com)
https://bit.ly/3IRPYMa

Myth Busting for Extension Educators: Reviewing the Literature on Pruning Woody Plants.
(Linda Chalker-Scott, WSU & Jim Downer, U of CA; Journal of the NACAA)
https://bit.ly/3q6R3XZ

Prevalence of Different Horticultural Taxa of Ivy (Hedera spp., Araliaceae) in Invading Populations. “‘English’ ivy (Hedera spp.) is a complex of invasive plant pests that are separated into several distinct taxa. To better understand the invasion by ivy of Pacific Northwest native forests, we investigated the taxonomic identity of 58 selected invasive populations in the Pacific Northwest.” (Midori M. Clarke, Sarah Reichard, Clement W. Hamilton; via researchgate.net)
https://bit.ly/3rVtpjB

Dorsal view (above) Giant Hornet, with wings spread
Giant Hornet – Oregon Department of Agriculture

Symptoms and Signs for Plant Problem Diagnosis – An Illustrated Glossary.  A great resource for diagnosticians! (Janna Beckerman and Tom Creswell, Department of Botany and Plant Pathology, Purdue University)
https://bit.ly/3ygsrPU

“Your Christmas tree may be adorned with lights and glitter. But 25,000 insects, mites, and spiders are sound asleep inside the tree.” (University of Bergen via Sciencedaily.com)
https://bit.ly/3dHMQnx

Why Giant Hornets Rub Their Abdomens on Beehives Before Attack. (Paige Embry, Entomologytoday.com)
https://bit.ly/3rTWqw5

VIDEOS:

Basics of Tree Identification-Twigs (Mo_Plant_Daddy_ via Youtube.com)
https://bit.ly/3oNyQzc

Basics of Tree Identifcaiton-Leaves (Mo_Plant_Daddy via Youtube.com)
https://bit.ly/3GyW9Th

Binomial Nomenclature: sp. vs. spp. (Mo_Plant_ Daddy via Youtube.com)
https://bit.ly/3IJHnuC

By Margaret Bayne, OSU Extension Service Staff-retired, OSU Master Gardener

Hemlock trees
Western hemlock trees – OSU

Pruning Established Trees. (Jim Downer, Gardenprofessors.com)
https://bit.ly/30nJQcS

The Northeast’s Hemlock Trees face extinction.  A tiny fly could save them. (Zoya Teirstein, Grist.org)
https://bit.ly/31RGeAs

Back-Seat Driver: The Parasite That Makes Bees Drop Off Its Babies. (Paige Embry, Entomologytoday.org)
https://bit.ly/3qsBsn1

VIDEO: Born Pregnant: Aphids Invade with an Onslaught of Clones. (PBS.org)
https://to.pbs.org/3qrl7zh

Honey bee flying in front of honeycomb
Honey bee – OSU

Are the honeybees raised in urban environments beneficial or detrimental?  As a native species.
(Jeanine Farley, Cabridgeday.com) https://bit.ly/30mOiZr

MORE ABOUT BEES…The Truth About Honey Bees.  “Raising nonnatives does not “save the bees”—and may harm them.” (Laura Tangley, nwf.org) https://bit.ly/3n4rPZW

Garden Logic – understanding correlation and causation in our gardens and landscapes (Linda Chalker-Scott, WSU) https://bit.ly/2YAAsC1

Prion-like protein acts as water sensor in seeds. (Jyoti Madhusoodanan, PNAS .org)
https://bit.ly/3wBUwQM

Pitcher Plant Moths and their Pitcher Plant Homes. (Indefenseofplants.com)
https://bit.ly/3n0KntY

Jumping spider
Jumping Spider

Spiders on Tiny Treadmills Give Scientists the Side-Eye.  “Jumping spiders see more in their periphery than previously known.” (Maddie Bender, scientificanamerican.com)
https://bit.ly/3qnFi0V

MORE ON SPIDERS…Spiders are much smarter than you think.  Cognition researchers are discovering surprising capabilities among a group of itsy-bitsy arachnids.” (Betsy Mason, knowablemagazine.org)
https://bit.ly/31VfPBX

Beetle Proves It’s Possible To Survive Millions Of Years Without Having Sex. (Rachael Funnell, Iflscience.com)
https://bit.ly/3oAp4z9


By Margaret Bayne, OSU Extension Service Staff-retired, OSU Master Gardener

Rooting around- the differences between taproots and mature roots. (Linda Chalker-Scott, WSU via Gardenprofessors.com) https://bit.ly/3vq4HFS

Is your Landscape Sustainable? (Jim Downer, Gardenprofessors.com) https://bit.ly/2U5bYOG

Water, water, everywhere.  Learn an easy trick to determine soil moisture. (Sylvia Thompson-Hacker, Gardenprofessors.com) https://bit.ly/3wpt08z

Container pots with vegetables and herbs, growing on a patio.
Container garden. Photo from Flickr by Wendy Cutler

Contain Yourself: Vegetable gardening in containers and small spaces. (John Porter, Gardenprofessors.com) https://bit.ly/2TzRuNS

How do we know which invasive plant pests will be the next big threats? (Rosyln Noar, et al, Entomologytoday.org) https://bit.ly/3DRT1l3

Signs and symptoms of plant disease: Is it fungal, viral or bacterial? (Jim Isleib, Michigan State University Extensionhttps://bit.ly/35s6qQt

Diagnosing Sick Plants. (Sarah D. William, et al, Ohio State U) https://bit.ly/35l4461

20 Questions on Plant Diagnosis. (Joy Bogg, et al, Ohio State U) https://bit.ly/3gmpCFG

Wasps are valuable for ecosystems, economy and human health (just like bees.) (UCL) https://bit.ly/3wlHkia

Bumble bee on purple clover blossom.
Bumble bee on clover blossom. Photo: Lynn Ketchum, Oregon State University

Bumble bees damage plant leaves and accelerate flower production when pollen is scarce. (Foteini G. Pashalidou et al, via Sciencemag.org) https://bit.ly/3gC0A4a

Ancient Wollemi Pines Resurgent.   “Ten years after its discovery, a vanishingly rare tree from the Cretaceous Period is a scientific darling and may soon become a commercial success too.” (Stephen McLoughlin & Viva Vajda, Americanscientist.org) https://bit.ly/35ibSFP

Plants Grown in Containers Course: Online (FREE and at your own pace course.) (NCSU) https://bit.ly/3gCLI5X

The DNA of lettuce unraveled: in 6000 years from weed to beloved vegetable. (Wageningen Plant Research) https://bit.ly/3voYzhk


By Margaret Bayne, OSU Extension Service Staff-retired, OSU Master Gardener

An Unusual Tree Company- Bartlett Tree Experts.  “In addition to providing tree services, this company also maintains the Bartlett Tree Research Laboratories and Arboretum. The latter includes over 300 acres of tree collections and ongoing research trials.  Here’s a sampling of the tree research…” (Linda Chalker-Scott, Gardenprofessors.com) https://bit.ly/3hg35LG

Field bindweed, Oregon State University

Bidding goodbye to the dreaded Bindweed-The white, trumpet-shaped flowers called bindweed that seem to bloom everywhere can be one of the most frustrating weeds for home gardeners.” (Andy Hulting, OSU) https://bit.ly/2ResDyb

Millipede Swarms Once Stopped Japanese Trains in Their Tracks.  “A team of scientists say they have figured out the cicada-like life cycles of the many-legged arthropods.” (Veronique Greenwood, Nytimes.com) https://nyti.ms/3bk7jOs

Leave Your Lawn Alone! (Linda Chalker-Scott, WSU) https://bit.ly/3y4fOHj

My Soil is Crap-Part II. (Jim Downer, gardenprofessors.com) https://bit.ly/3ff6Tu3

By Margaret Bayne, OSU Extension Service Staff-retired, OSU Master Gardener

Revised publication: How to Control Slugs in Your Garden.  Practical tips on how to deal with slugs in your garden, given in both English and Spanish. (EM 9155-Neil Bell, Amy J. Dreves, OSU) https://bit.ly/3t32tfr

“Can we just quit with the vinegar-epsom salts weed-killer nonsense?  It doesn’t matter how safe it sounds if it doesn’t work.”n(Ohio State University Extension) https://bit.ly/3dbXuUp

Soil bacteria could improve crop yields, via fungi (Michael J. Hass, Cornell University) https://bit.ly/3uFaTtN

Rose leaves with viruses. Leaves are speckled with pale yellow spots.
Rose virus. Photo: Jay Pscheidt, OSU

NEW SECTION IN THE PNW HANDBOOK: Plant Viruses: Dead or Alive? (Jay Pschdeidt, OSU) https://bit.ly/2PKMnsF

Dirty Dozen? Not so fast… Each year, the Environmental Working Group (EWG) issues a list of foods – the so-called ‘Dirty Dozen’ – which it considers to have the highest pesticide residues.  (Cornell University) https://bit.ly/3tc7qCH

This robot uses AI to pollinate greenhouse tomatoes. (Agrotectire.com) https://bit.ly/3mCGBVZ

Handful of soil.
Soil. Photo: OSU

My soil is crap. Or is it? (Jim Downer, Garden Professors.com) https://bit.ly/3g1MYk3

Bizarre ‘worm tornado’ in New Jersey has scientists baffled. (Mindy Weisberger, livescience.com) https://bit.ly/3wOksJ0

The AAS (All-America Selections) judges pick their favorite plants. (All-America selections.org_ https://bit.ly/3g6xb3P

To mulch or not to mulch? It shouldn’t even be a question. (Linda Chalker-Scott, WSU) https://bit.ly/3t7r0A9

Understanding mysteries of plant diseases: Diagnosis and Detection (Part 2 of 3 in this blog series)- Something is wrong? (Jim Dower, Garden Professors.com) https://bit.ly/3t7TucX

Strawberry plant with ripe strawberries.
Strawberries. Photo: Bernadine Strik, OSU

Watch the Video! -The Uncommon Berry Patch.  A presentation that covers some less-commonly grown berries for the home garden as well as some native fruits found in western Oregon. (Neil Bell, Dr. Bernadine Strik, OSU) https://bit.ly/3fZCNwH