Gypsy moth (Lymantria dispar L.) attraction to disparlure enantiomers and the olefin precursor in the People's Republic of China.

Pheromone traps baited with disparlure,cis-7,8-epoxy-2-methyl-octadecane, captured males ofLymantria dispar, the gypsy moth, at two widely separated locations in the People's Republic of China. The (+) enantiomer of disparlure attracted significantly more males than the racemate; addition of olefin reduced captures. The duration of the flight period was longer (eight weeks) and peaked earlier near Beijing than farther north near Dunhua (five weeks).