Mid- summer is the time of year that adult Japanese Beetle populations can really explode. We are in the midst of controlling them now, especially in the Rose Garden. Instead of spraying harsh chemicals, we find that mechanical control works well when Japanese Beetle populations are relatively low. Simply put, we hand collect the beetles and put them in a bucket of soapy water. You can also place them in a jar then put them in the freezer. When collecting beetles, make sure you enclose them with your hand because their first defense is to fall to the ground and then quickly fly away (no doubt to attack another rose bush). Never use beetle traps as they have strong attractants (called pheremones) that are guaranteed to attract every Japanese Beetle in the neighborhood! Another organic method of control is to apply nematodes to your lawn in early August, after the females lay eggs. Nematodes (Heterorhabditis species) have been shown to be effective at controlling the grub, or larval stage of the beetle. Remember, squishing always works, it’s just messier!

This entry was posted on Monday, July 21st, 2008 at 7:00 am and is filed under Cynthia Druckenbrod, Japanese Beetle, Rose. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.