Signup to receive email updates
- Home, Yard, & Garden Newsletter article from 7-20-15
- Home, Yard, & Garden Newsletter article from 6-22-15
- White Grubs
- Japanese Beetles and Silk Clipping: New Research on an Old Foe
- Japanese Beetles – lower numbers this summer!
- Japanese beetles survived the winter, now what
- Japanese Beetle Update by Dr. Phil Nixon
- Japanese Beetle Factsheet - Utah State University
- Japanese Beetle Myth Information
- Japanese Beetle Q&A by Minnesota Extension
- University of Illinois Extension Home, Yard, and Garden Pest Newsletter
- Japanese Beetle and Look-alike Pictures
- Request a speaker
- University of Illinois Extension Field Crop IPM information
- ILRiverHort Blog - Ferree's Horticulture Blog
- July 2015 (1)
- June 2015 (1)
- September 2014 (1)
- July 2014 (3)
- June 2014 (2)
- July 2013 (1)
- June 2013 (8)
- May 2013 (1)
- July 2012 (1)
- June 2012 (19)
38 Total Posts
follow our RSS feed
Friday, June 15, 2012
Japanese beetles go through a yearlong lifecycle. Adult Japanese beetles tend to emerge in our area around the mid to latter part of June. Those adult beetles, noted for their metallic green head, metallic brown wing covers, and white abdomen-lining "tufts" of hair, mate and burrow a couple inches deep in the soil. There they lay an egg or two and continue the process every few days for a period lasting over a month.
Adults can feed on several hundred plant species, but are especially attracted to smartweed inundated fields and poison ivy or multi-flora rose inundated waste areas. In the crop, the beetles will devour leaves and portions of the tassel while also clipping silks. The white grubs that emerge from deposited eggs are especially sensitive to dry soil conditions, which can increase mortality. Grubs survive by devouring root tissue and possibly organic matter.
Root feeding continues until temperatures drop, usually around October, bringing their activity to a halt. Feeding resumes the following spring. These white grubs, identified by V-shaped" hair arrangements on the underside of the "tail-end," complete development and feeding toward the end of May or early June when they pupate.