Journal
PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
Volume 80, Issue 1, Pages 12-20Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.pestbp.2004.05.001
Keywords
Ostrinia furnacalis; deltamethrin; sex pheromone; reproductive behavior; wind tunnel; sublethal
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The first, third, and fifth instar larvae of Asian corn borer, Ostrinia furnacalis (Guenee) (Lepidoptera: Pyralidae), were treated with a lethal dose 30% of deltamethrin to determine its sublethal effects on chemical communication of the adult survivors. The capability of all males surviving deltamethrin to contact the pheromone source in a wind tunnel was significantly reduced, but those treated as the first and third instars also exhibited lower percentages of 'orientation,' 'up-wind flight,' and 'approaching' behaviors than the control males. Female moths from the deltamethrin treatment exhibited similar calling periodicity and percentages to the control moths during 10-h scotophase. However, approximately 20% of the females that survived the pyrethroid in the first and third instars contained significantly higher amounts of sex pheromone and wider coefficients of variation of the ratio of E12-tetradecenyl acetate to its Z isomer in those female survivors. There was no significant difference in the pheromone titers and coefficients of variation in control females and the females treated in the fifth instars. The present study indicates that the Asian corn borer may possess a compensation system by which the males that survived treatment at larval stage present a lower response to the pheromone, while the female survivors produce and release more pheromone. (C) 2004 Elsevier Inc. All rights reserved.
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