Co-Authors:
Dunkelblum, E., Institute of Plant Protection, Agricultural Research Organization, The Volcani Center, Bet Dagan, 50 250, Israel
Kehat, M., Institute of Plant Protection, Agricultural Research Organization, The Volcani Center, Bet Dagan, 50 250, Israel
Harel, M., Institute of Plant Protection, Agricultural Research Organization, The Volcani Center, Bet Dagan, 50 250, Israel
Gordon, D., Institute of Plant Protection, Agricultural Research Organization, The Volcani Center, Bet Dagan, 50 250, Israel
Abstract:
The sexual behaviour of females of the Egyptian cotton leafworm, Spodoptera littoralis (Boisduval), was studied in the laboratory. Calling of females was maximal on the 2-3rd night between 3 and 9 h into scotophase. Largest amounts of pheromone were found in the glands of 1-3 day-old ♀ ♀ 2-3 h into scotophase: a maximum of 6-8 ng of (Z,E)-9,11-tetradecadienyl acetate per female. Very low amounts of pheromone were detected 1 h before and at the end of scotophase. Mating of 2-3 day-old females, occurred mainly between 0 and 3 h into scotophase. Mating suppressed the pheromone titre drastically when measured 3 h after copulation but the titre increased significantly after 24 h, prior to egg laying. However, when egg laying commenced, the amount of pheromone detected was negligible. A high concentration of synthetic pheromone in closed containers did not affect calling of females. On the other hand mating was drastically suppressed in a pheromone-permeated atmosphere. © 1987 Dr W. Junk Publishers.
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