Seattle Life in the Yard

Sustain biodiversity: garden with native plants.

Invasive New Bug

Leave a comment

Sharon J. Collman (WSU Snohomish County Extension) has posted information about a little red invasive beetle and I thought some of you might be interested in keeping a look out for it. It was found & identified last spring and now is about the time it could start to show up if you are going to see it. The wordpress link below has a good picture.
I asked permission to pass on her information and she said yes, so here is what she had posted to an email group I subscribe to: >>>>>

Last spring, a lovely red but devastating, new leaf beetle invaded Bellevue.
This invasive species was reported to the WSU Plant Diagnostic Laboratory and sent to the Washington State Department of Agriculture by an alert citizen. This beetle is known from Europe and Turkey and may be Mediterranean in origin. It has been restricted to seven northeast coastal states since the early 1990s, but until last spring was not recorded anywhere west of those states. It has overwintered successfully at both locations in Bellevue. The two reporting households are two miles apart and neighbors in the north location also have seen the beetles on their plants.

The beetles are reported to be strong fliers so they could spread quickly. On the upside of this insect, they emit amusing little squeaks, or perhaps a chorus of protest, when handled. Photos and more information can be found at . From there click the link to a more comprehensive fact sheet with more photos by Eric LaGasa, WSDA, and WSU faculty Todd Murray and Jenny Glass.

This beetle represents no threat to most landscape plants as it specifically feeds on lilies (not daylilies) fritillaries and some native species of lily relatives, and less frequently, members of the nightshade family (e.g. potatoes). They will likely have the most impact on the cut flower industry, lily growers, lily exporters, lily hobbyists and possibly some of our related native plants such as Solomon’s seal. Also, the damage from beetles may trigger an increase in pesticide use.

One of our two alert citizens said that the beetles began crawling around his lilies on May 18th, and were already mating and laying eggs; the other citizen says she’s also seen them mating and laying eggs. Both are collecting samples so we can determine what their life cycle will be in our area. In the east, they are reported to have 2 generations per year.

The collected beetles also will be sent to Canadian scientists who are studying the genetics of this beetle to determine if they came from separate populations (and thus different origins), or if they came from the eastern states. They are trying to trace the route of movement of this invasive species.

WSDA is trying to determine just how far this beetle has spread in the Bellevue area. Homeowners or growers should inspect their plants for the beautiful bright red little beetles, or their red eggs. Soon their larvae, which cover themselves with their frass (bug poo) and look like little bags of slime, should also be visible. Feeding damage to lilies includes scraping off the leafy surface or chewing from the edges of leaves. The scraped leaves then wilt or “melt” away.

It may be that this population of the red lily beetle is small enough that with some vigilance the population can be eradicated. It will take the efforts of everyone to delineate this population and stop the spread of this beetle. There is no funding for government intervention.

To help us determine the extent that this beetle has spread, anyone finding the red lily leaf beetle is requested to report it to Eric LaGasa (, phone: 360-902-2063), or Chris Looney, (, phone: 360.902.2042)Washington Department of Agriculture (email:, phone: 360-902-2063), or Sharon J. Collman, WSU Snohomish County Extension (email:, phone:
425-357-6025). Be reassured that this is a safe action with no negative consequences and no blame will be assigned. <<<<<

Wow. Keep your eyes open for these little buggers and we can be good citizen scientists if we find and report.
All the best.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s