Effect of temperature on the sex pheromone communication of Chilo suppressalis Walker (Lepidoptera: Pyralidae)

doi:10.13287/j.1001-9332.201711.036

Abstract

Abstract: Environmental factors affect the insect sex pheromone communication, and subsequently the attractiveness of sex pheromone lures used in pest control. In order to provide the guidance for the sex pheromone use in control of Chilo suppressalis, effects of temperature on the sex pheromone production in female moths and electro-physiological response of male moths to sex pheromones, were explored in our present study. The insects were treated with different temperatures (15, 20, 25, 30 and 35 ℃) at pupa and adult stages, then the contents and relative proportion of each of three pheromone components were determined by a gas chromatography (GC), and the electro-physiological response to sex pheromones were detected by an electroantennograph (EAG). Results showed that the contents of all three sex pheromone components (Z9-16:Ald, Z11-16:Ald and Z13-18:Ald) were highest in 25 ℃ treated females, significantly higher than those in other temperature treated females, and the relative proportion of Z13-18:Ald was significantly reduced in 25 ℃ treated females. On the male part, EAG responses to each of the three sex pheromone components and the tertiary blend showed no significant difference at temperatures between 15-25 ℃, but EAG va-lues decreased significantly as the temperature increased to 30 ℃ and further to 35 ℃ for component Z9-16:Ald, Z11-16:Ald and the blend, and to 35 ℃ for Z13-18:Ald. Taken together, the optimum temperature for the sex pheromone communication was 20-25 ℃ in C. suppressalis, and too higher or lower temperature will affect the normal communication. The study provided an important reference for the use of sex pheromone in pest control, and for prediction of the development of pest population at extremely low or high temperature.

YU Qi, YAN Qi, DONG Shuang-lin. Effect of temperature on the sex pheromone communication of Chilo suppressalis Walker (Lepidoptera: Pyralidae)[J]. Chinese Journal of Applied Ecology, 2017, 28(11): 3784-3788.

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