Japanese beetles are on the way
Avoid pruning your plants in July or August. Unless, of course, you plan on serving pie to Japanese beetles.
July 1, 2011 - Author: Dave Smitley, Michigan State University Extension, Department of Entomology
You can expect to find Japanese beetles on your favorite flowers any day now. Unfortunately, we don’t have any non-chemical methods of protecting plants other than removing of the beetles by hand. Susceptible plants can be protected with a combination of an imidacloprid basal drench (Tree and Shrub Insect Control, or other imidacloprid products), and weekly sprays of carbaryl (Sevin) or cyfluthrin (Multi-Insect Killer, or others).
Japanese beetles can smell their favorite food plants, so keep your favorite plants as pest-free as possible and don’t prune them in July or August, because to them, the smell of crushed leaves is like a freshly baked apple pie.
Dr. Smitley's work is funded in part by MSU's AgBioResearch.