Abstract

Number of male gypsy moths, Lymantria dispar (L.), captured each day in U.S. Department of Agriculture pheromone-baited milk-carton traps declined as the traps filled. Field tests of traps with screen false bottoms showed that the decline was due in part to the reduced volume inside the trap. Presumably, moths that entered partially filled traps located entrance holes more easily and escaped before succumbing to the insecticide. Additional tests showed that presence of decomposing moths further suppressed catch, but that dried or fresh moths or an inert substrate (styrofoam chips mixed with activated charcoal) below a screen false bottom had no such effect.

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