RESPONSE OF GYPSY-MOTH (LEPIDOPTERA, LYMANTRIIDAE) LARVAE TO STICKY BARRIER BANDS ON SIMULATED TREES

The behavioral response of gypsy moth, Lymantria dispar (L.), unfed first instars to intact and defective sticky barrier bands was determined. The barrier bands were installed on simulated trees in a laboratory arena. Defects incorporated into the barrier bands were: gaps in the sticky material (2 mm, 4 mm, and 8 mm width), tunnels under the band (3 mm and 6 mm height) and bridges across the sticky material (cross sections of 1 mm(2) and 2 mm diameter). The defects allowing the highest percentage of larvae to cross were the 2 mm diameter bridge (55.3%) and the 6 mm high tunnel (46.6%). Other defects also allowed crossing. These findings indicate the importance of frequent inspection and repair of sticky barrier bands that are used for gypsy moth control.