Japanese Beetle (Popillia japonica) adults are starting to take flight in southern Ontario. They have been spotted in Hamilton and Niagara this week. Read on for an updated post on WHAT and WHEN to spray for JB to meet certification requirements if you ship product outside Ontario.
Navigating the guidelines for exporting plant material out of a Japanese Beetle (JB) zone such as Ontario can be tricky business, especially with upcoming changes to the Greenhouse-Grown Plant Certification Program (GCP; formerly CGCP).
Also not helping is the general lack of information out there regarding proper timing of JB control products. For example, did you know that NO products are considered effective between May 15 and June 15? This could create problems if you’re shipping outside Ontario in the next month and haven’t treated yet.
To make things easier, I’ve created a treatment “decision tree” and a JB product “cheat sheet” for growers of greenhouse ornamentals.