Interesting find during the first Plant Problem Walk of the season for Linn & Benton County Master Gardeners. I had pre-scouted problems at the Oak Creek Center for Urban Horticulture and identified rust on this Oregon Grape (Mahonia aquifolium).
When we came back a week later for the tour the underside of the new leaves were covered with adult whiteflies! (Resource from the PNW Insect Management Handbook)
Here are a closeup of an adult and eggs taken with my new toy, I mean USB microscope.
Caught this one in action unfolding it’s new wings:
The first 2017 Garden Pest Update for the mid-Willamette Valley has some interesting finds. This episode was filmed at the Oak Creek Center for Urban Horticulture on the OSU Campus. Scroll down for resources on the problems mentioned in the video.
Sunburn on Rhododendron
Dealing with thistle: a perennial & hard to manage weed
Aphid Management Guidelines
Rust on Oregon Grape (Mahonia aquifolium)
Not mentioned in the video but fun finds during the recent MG Plant Problem Walk:
Whitefly adult and eggs on new foliage of Oregon Grape (left). (
Close up photos coming soon! New: Check out the blog post for closeup & video)