Adult Japanese beetles are one quarter to one half inch long with copper colored wing covers and a shiny metallic green head. Between the green head and tiny tufts of white hair along their side you'll recognize them easily as they happily munch on your roses.
While they generally don't eat dogwood, forsythia, holly, lilac, evergreens and Hosta, they'll eat darn near everything else. These beetles feed on flowers and fruits making a skeleton of the leaves by eating the green parts and leaving the veins. Adults are most active from 9 a.m. - 3 p.m. on warm summer days. These voracious pests prefer plants in direct sun, so shady areas are usually less damaged.
The bacterial spore, sold as 'Doom' or 'Grub Attack' is generally used to control these pests. Using a hormone lure in your yard simply attracts more beetles to your yard. Put the lure somewhere else a hundred yards away encouraging the beetles to go elsewhere. Unfortunately, reducing the beetles in your yard will not reduce their attacks in succeeding years. These beetles are great fliers and can travel upwards of ten miles from where they hatched.
Handpicking is also effective on your prized plants - drop the beetles into a bucket of soapy water to kill them. There i
Doug Green, an award winning garden author with 7 books published answers gardening questions in his free gardening newsletter at http://www.learn-rose-gardening.com