Inhibition of sex pheromone communications of Trichogramma brassicae (Hymenoptera) by the insecticide chlorpyrifos

摘要: Biological control agents such as entomophagus insects (e.g., Trichogramma sp.) are important components of integrated pest management (IPM) programs. Because pesticides also an component IPM programs, it is essential to understand how biological affected by and these effects may affect the effectiveness agents. Contrary most insect species that use volatile pheromones for mate location, T. brassicae one few using a substrate-borne sex pheromone mating. In this work we determined organophosphorus insecticide, chlorpyrifos, on reception males emission virgin females. The used in tests were survivors from acute toxicity test which individuals exposed dose chlorpyrifos equivalent 20% lethal dose. Males survived insecticide exposure spent much less time area marked with female than (mean choice indexes, 0.46 [0.34 SD] vs 0.70 [0.25 SD], p < 0.001). kinetics response marking treated females indicated decreased surviving insecticide. Therefore, inhibited These results interpreted context regulation nervous system according mode action chlorpyrifos. Extensions actual pheromone, traps, population biology sp. discussed.