Multicolored Asian Lady Beetles destryoing my hops

Asked August 6, 2015, 6:37 PM EDT

HELP! This is the second summer that my hop vines are loaded with Multicolored Asian Lady Beetles. I have tried using some organic spray as well as a strong jet of water but they still persist. I pretty much have given up on this year's hop harvest. I want to exterminate them from my hop vines so hopefully next year I can have a good crop. Please advise on the best way to exterminate these little evil bugs. I am in Happy Valley, OR living on the west side of Mt. Scott.

Clackamas County Oregon insect issues hops horticulture

1 Response

As it turns out, Japanese beetles don’t live here in Oregon or anywhere else in the Western United States. Most lady beetles are about 1/4-inch long, and often a bright color, sometimes with dots, sometimes not. The publication “Oregon Lady Beetles” has images of a number of ladies native to Oregon. The Asian lady beetle is pictured on page 2 at the upper left. That image shows only 2 of the very many possible color variations. http://www.oregon.gov/ODA/PLANT/docs/pdf/ippm_ladybeetle_flyer2010.pdf Asian lady beetles spend the winter in the general region where they lived during the growing season. During the winter they are considered nuisance pests, congregating on the south or west sides of light-colored buildings. On cold days, they follow the heat gradient into the wall void, and sometimes into our living rooms, bedrooms and the like. The bad news is that, when annoyed, they may bite and/or release red droplets that stain fabrics and painted surfaces. The good news is that they don’t breed during the winter. This news release from Oregon State University explains the beetles’ habits and how you might manage them. http://extension.oregonstate.edu/news/story.php?S_No=1001&storyType=garden Japanese beetle adults are bright metallic green with copper-colored wing covers and are about 3/8 of an inch long and 1/4 inch wide. Two small tufts of white hair occur just behind the wing covers with five patches of white hair along each side. The Adult beetles fly from about May through September. You might want to review this this informative pest alert about Japanese beetles from the Oregon Department of Agriculture: http://www.oregon.gov/ODA/PLANT/IPPM/jb_alert.shtml