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