June 24, 2025: Japanese Beetles Have Started to Emerge!

Japanese Beetle (Popillia japonica) adults were caught in pheromone traps yesterday in Vineland, ON, by Cassie Russell, OMAFA’s Nursery and Landscape Specialist. Read on for what the start of the adult emergence period means in terms of pest management for outdoor nursery and floriculture crops.

Scouting and Adult Control:

Look for these shiny green and copper beetles feeding on grape leaves, roses and many other trees and shrubs.  Where possible, homeowners can knock adults into a bucket of soapy water (to smother them). Only a few insecticides are registered for the adults: BeetleTerminator and Imidan.

Control of Grubs and the JB Certification Program:

Preventative applications of Intercept and Acelepryn are registered for white grubs (e.g. European chafer, June beetle, and/or Japanese beetle) in nursery and greenhouse production and the application period begins now that we’ve seen adults flying.

As the beetles emerged a bit late this year, the period for applying preventative applications will continue until August 20th. Then only curative applications can be used. If you’re looking for more direction on what can be applied (and when) for JB control for phytosanitary measures, below is a link to the JB control infographic and article from a few months ago:

Japanese Beetle Control 2024: Get your Japanese Beetle Treatments on BEFORE May 15!


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