Laboratory studies were also conducted to examine the interaction between the entomopathogenic nematode, Heterorhabditis marelatus and an insecticide used against Japanese beetle larvae. As a result of the insecticide work, a soil application of imidicloprid was approved as an acceptable treatment for regulatory control. Dipping root balls in chlorpyrifos also provided excellent results. Laboratory tests demonstrated no interaction between an insecticide used for grub control and an entomopathogenic nematode. Testing with Tiphia are ongoing.
Japanese beetle is a serious problem for the nursery industry.
The need for reliable, consistent treatments to reduce the risk of spreading this pest is tremendous. Additionally, data generated in this program will help establish a long-term, sustainable reduction in the Japanese beetle population. Information generated on cultural practices and biological control in conjunction with the use of low-impact, environmentally safe insecticides will help reduce the risk of spread.