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Gypsy Moth

US Gypsy Moth Fall Treatments

Gypsy moth is a non-native insect pest that defoliates forest, ornamental, and orchard trees. Its preferred hosts include, but are not limited to: oak, basswood, willow, maple, birch, and poplar. High populations of larvae affect the aesthetic and recreational value of an infested area. Most healthy trees can withstand a single year of moderate-to-severe defoliation, but two-to-three years of heavy defoliation can result in branch or whole tree mortality. 

TreeAzin Efficacy and Fall Treatments

Treatments for gypsy moth can be made in the fall in September, October or November at a dose rate of 8 mL/inch DBH to get ahead of emerging larvae the following spring. BioForest’s efficacy trial in Massachusetts in 2016 indicated that injections done in all fall months resulted in significant TreeAzin residues in leaf samples collected in the spring of 2017 (Figure 1).

Figure 1: TreeAzin residues present in foliage collected in May 2017 following fall treatments in 2016. The red line shows the minimum concentration of TreeAzin required to kill gypsy moth larvae.

BioForest recommends treating in November to ensure the highest concentrations of TreeAzin are available in leaves the following spring. Red and white oak trees were used in BioForest’s fall treatment trial and were able to uptake product even after the leaves had fallen in November. Transpiration rates can be high in September and tend to slow down in October when leaves are senescing, which may slow product uptake. Not all tree species may uptake product effectively in November without leaves.

When treating trees other than oak in late fall, BioForest recommends consulting a Technical Specialist before application.

For more information on gypsy moth treatment options with TreeAzin, click here.




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