Management of gypsy moths using sticky trunk barriers and larval removal

Abstract

The effects of sticky trunk barriers and the removal of gypsy moth, Lymantria dispar, larvae from burlap skirts positioned above the trunk barriers on larval density and defoliation in the canopy of oak Quercus trees was tested. Sticky barrier bands reduced larval gypsy moth density and defoliation by approximately 25 and 30%, respectively. There was no indication that larval removal affected larval density or damage in the canopies of treated trees. The use of barrier bands and burlaps resulted in a greater accumulation of gypsy moth pupae and egg masses on the lower two m of the boles of treated trees, making these life stages more accessible for later removal or treatment. None of the treatments affected the total number of gypsy moth egg masses on treated trees. These results suggest that sticky trunk barriers can provide some foliage protection, but that, because the amount of protection is relatively small, they should not be relied upon for protection from gypsy moth damage. -Authors