Abstract
Stem applications of two contact insecticides (carbaryl and a water-based pyrethroid mixture containing fenvalerate and tetramethrin), two chitin-inhibiting benzoylphenylureas (BPU) (diflubenzuron and triflumuron), and three mechanical barrier devices were tested in 1984 for gypsy moth, Lymantria dispar (L.), population control (egg mass reduction) on moderately infested red oaks, Quercus rubra L., in Pennsylvania. Sprays applied directly to tree stems and to burlap refugia were tested. Barrier devices included maintained, but unsprayed, burlap refugia; a commercial sticky tape; and a loose insect-trapping adhesive. Gypsy moth density on burlap-banded and unbanded control trees increased by 54 and 190%, respectively. Stem and burlap sprays of BPU resulted in a ca. 50% reduction in egg masses. Burlap sprays of either carbaryl or the pyrethroid mixture appeared to inhibit population increase as did the maintained burlap refugia and both sticky barriers.
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