While spring and/or fall applications are allowed on certain product labels, recent university research has indicated that spring applications have been more effective at controlling EAB and protecting canopy health. Thus, treatment of large trees should begin before the trees become infested. Larger trees may require two consecutive years of treatment before they are effectively protected. University research indicates that soil drenches or injections of imidacloprid provide excellent EAB protection for small ash trees in the first year following treatment. Tree-äge, Tree-äge G4 (emamectin benzoate).Boxer Insecticide-Miticide (emamectin benzoate).ACECAP Systemic Insecticide Tree Implants (acephate).Insecticide products that are available for use by professionals, with information on appropriate application methods and application timings, are summarized in Table 1. For additional information on this topic, see University of Wisconsin Garden Pest Alert XHT1215 “Is My Ash Tree Worth Treating for Emerald Ash Borer”.Įmerald ash borer insecticide treatment options. Ash trees with greater than 50% canopy thinning should be removed and destroyed in accordance with established state and federal guidelines. Insecticide treatments are not suggested for trees with greater than 50% canopy thinning. Research suggests that insecticide treatments are significantly more effective on EAB-infested ash trees with less than 50% canopy thinning. In addition, consider the health of each tree before treating. Due to the expense of yearly insecticide treatments, one should consider the value of a particular ash tree in relation to insecticide treatment costs before making any treatments. However, not all ash trees should be treated as some may be too extensively compromised or in poor condition to receive treatment. Since the presence and infestation level of EAB is quite difficult to determine at early stages of an infestation, insecticide treatments may be merited to mitigate damage by EAB. Emerald ash borer insecticide treatment considerations.Ī variety of insecticide products and application methods are available to professionals for control of the emerald ash borer (EAB).
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