Traps hung on small trees of 3–8 cm diam and baited with racemic epoxides, hydrocarbons and other analogues related to racemiccis-7,8-epoxy-2-methyloctadecane (disparlure) resulted in maleLymantria disparL. (gypsy moth) catches statistically indistinguishable from those of unbaited traps. Only (±)-disparlure yielded trap catches statistically above the level of unbaited traps. However, trap placement on trees of ca. 0.5 m diam produced appreciable trap catches, even in unbaited traps.