More than one application may be needed. Bt can be applied from the ground, but it must reach the tops of trees to be effective. A certified commercial, pesticide applicator may be needed to apply this insecticide to large trees. Disparlure is a sex attractant that is attractive only to male gypsy moths. It is not effective as a control method but is used to survey for or detect male moths.
Traps are available at some garden stores and from pheromone trap suppliers.
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