Japanese Beetles

Asked September 28, 2016, 5:07 PM EDT

My roses and vines were decimated by Japanese Beetles for the 3rd summer. I've avoided the pheromone bags, but is there anything that we can do to diminish the attack? I saw a flyer about Milky Spore on your lawn to destroy the grubs. Any truth to this for CO? Thanks


Arapahoe County Colorado

1 Response

Milky spore, a bacterial disease of white grubs (larvae of Japanese and related beetles) has not been well established in Colorado. So it might be worthwhile to use - but it will only kill maybe 10% of the grubs - if there are any in your lawn/yard.

Since adult Japanese beetles can fly a couple miles to food sources, it is a sure bet that the ones you had this year were not "born and raised" from grubs in your lawn/yard.

Here's some Japanese beetle info from CSU Extension: http://extension.colostate.edu/topic-areas/insects/japanese-beetle-5-601/