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Protective Cover Sprays MSU studies have shown that applications TM®® of Onyx, Tempo and Sevin SL provided good control of EAB, especially when the insecticides were applied in late May and again in early July. Acephate sprays were less ® effective. BotaniGard (Beauvaria bassiana) was also ineffective under high pest pres- ® sure. Astro (permethrin) was not evaluated against EAB in these tests, but has been effective for controlling other species of wood borers and bark beetles. ® In another MSU study, spraying Tempo just on the foliage and upper branches or spraying the entire tree were more effective than simply spraying just the trunk and large branches. This suggests that some cover sprays may be especially effective for con- trolling EAB adults as they feed on leaves in the canopy. A single, well-timed spray Noninvasive Basal Trunk Sprays with was also found to provide good control of Dinotefuran EAB, although two sprays may provide extra assurance given the long period of adult EAB Studies to date indicate that systemic basal activity. trunk sprays with dinotefuran are about as It should be noted that spraying large trees effective as imidacloprid treatments. MSU is likely to result in a considerable amount of and OSU studies have evaluated residues insecticide drift, even when conditions are in leaves from trees treated with the basal ideal. Drift and potential effects of insecti- trunk spray. Results show that the dinotefuran cides on non-target organisms should be effectively moved into the trees and was considered when selecting options for EAB translocated to the canopy at rates similar to control. those of other trunk-injected insecticides, and faster than other soil-applied neonicotinoid products. Acknowledgements As with imidacloprid treatments, control of Production and distribution of this bulletin EAB with dinotefuran has been variable in were supported in part by cooperative agree- research trials. In an MSU study conducted ments from the U.S. Department of Agricul- in 2007 and 2008, dinotefuran trunk sprays tures Animal and Plant Health Inspection reduced EAB larval density by approxi- Service (USDA-APHIS) and the U.S. Forest mately 30 percent to 60 percent compared Service, Northeastern Area, Forest Health to the heavily infested untreated trees. The Protection. This bulletin may not necessarily treatment was effective for only one year express the views of the USDA. and would have to be applied annually. In general, control is better and more consistent in smaller trees than in large trees, but more research is needed with larger trees. Studies to address the long-term effectiveness of annual dinotefuran applications for control of EAB are underway. 10 INSECTICIDE OPTIONS FOR PROTECTING ASH TREES FROM EMEORER