I have three Viburnum Trilobum (High Bush Cranberry). Last year the leaves were badly skeletonized. I would like to prevent a recurrence this year. Does anyone know what I can use to attack the beetle?
I prefer the most organic approach. Would a soil drench of BT help at this time to reduce larvae? Would cutting back the shrubs help?
Please help
Viburnum Leaf Beetle
Use the abundance of resources available to you from institutions whose research you've already paid for, to wit:
http://www.hort.cornell.edu/vlb/
They even offer a way for you to participate in the broader learning opportunity about this catastrophic pest.
Here are the recommendations on VLB control:
http://www.hort.cornell.edu/vlb/newtools.html
http://www.hort.cornell.edu/vlb/manage.html
You may also benefit by directly contacting Cornell University entomology program or cooperative extension service staff.
Good luck with defeating this devil.
Thank you VB.
I did look at Cornell and other sites, but I also wanted some personal experiences. I am thinking of replacing these bushes with more resistant varieties. Applying a soil drench is much simpler than applying and reapplying horticultural oil.
I'm pretty sure BT will not afford any protection.
I have no personal experience, since I don't garden where VLB is prevalent. I think the approach of planting resistant species is the right one - eliminates applying pesticides almost entirely.
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