Abstract
A 3-layer laminated plastic dispenser of disparlure, the sex pheromone of the gypsy moth, Porthetria dispar (L.), was effective in laboratory and field trials for an entire season and emitted lure at a fairly uniform rate whether its ends were open or sealed. Because lure content of the dispensers dropped very little after a season of exposure, the rate of emission of the laminates should be increased to increase attraction and make more efficient use of the lure. Cotton wicks performed as well as the laminated dispensers in the field, but in the laboratory their emission rates dropped sharply initially and then continued at a rate ca. 10-fold less than that of the laminates. Triangular traps caught more males than Johnson traps when both were baited with the same dispenser.
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