No. of Recommendations: 1
As promised, I looked up the 2 articles covering Japanese Beetles which were published in Tree Care Industry Magazine in April, 2005 and May, 2006 authored by Dr. Lakshmi Sridharan, a scientist with a Ph.D in molecular biology, botany and microbiology.
Her website is

I won't begin to try to repeat everything contained in the articles since they are 4 and 5 pages long respectively. You may be able to obtain reprints of the articles by contacting her via her website. In the article specific to Japanese Beetles she mentions many methods of control including chemical, biological and predatory insects and birds. She also covers things to watch for in planting to disrupt the beetle lifecycle. Apparently one of the biggest contributors to the proliferation of Jap Beetles is the large amounts of lawn surrounding the host trees: The adult, beetle, stage requires leaves of trees and shrubs to survive; the egg, larval/grub stages require grass/grass roots to survive and thrive. They are a "severe threat to members of the family Rosaceae ie. roses, apples, cherries, etc. ... Adult beetles infest nearly 300 plat species - shad and fruit trees, ornamental shrubs, small fruits, garden crops, weeds and field crops."

On the subject of Milky Spore for control, she specifically mentions NOT using a chemical lawn treatments while using milky spore: "Do not use any other insecticides when using bacterial spores as the bacteria needs to complete its life cycle on the beetle". She also comments: "... spore product may require up to 4 years after application to become effective but can be active against grubs for 20 years."

On Nematodes, her comments are quite lengthy, and cover a fairly detailed description of why and how they work. She concludes with "Apply the nematodes wehen the white grubs are in the second instars. Irrigate the soil befor and after nematode applications to increase the efficacy of the nematodes."

In the area of cultural control, she suggests not growing fruit trees (most specifically, apple trees) in the vicinity of a lawn and "since warm temperatures and moisture in the soil provide favorable conditions for hatching of the eggs into larva and the further development of the grubs, do not irrigate during the time when the eggs and the first instar larvae are developing."

Okay for now. Hope that helps.

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