Biological and behavioral effects of Pyriproxyfen on pheromone production and perception. of Tribolium castaneum (Coleoptera: Tenebrionidae).

Abstract

Pyriproxyfen (Admiral) is an insect growth regulator (IGR) acts as antijuvenile hormone. The present work aims to investigate the toxicological effect of Pyriproxyfen on both sexes of rust red flour beetle, Tribolium castaneum resulted from treated 4 th larval instar with LC 50 value (2.4ppm) and its effect on female production and male's perception to pheromone. The results indicated that both treated and untreated sexes could secrete a pheromone that was able to stimulate the opposite sex as well as its own sex. But production and responsiveness of pheromone in untreated groups were significantly higher than treated one. Females secreted a pheromone is a sex pheromone, While the pheromone secreted by males is an aggregation pheromone.

Toxic Effects of Four Plant Oils on Trogoderma Granarium Everts and Pheromone Response

“…Responsiveness and pheromone production were significantly higher in untreated groups than in treated ones. This agreed with El- Barky et al (2012), who reported similar findings in adult T. castaneum that had emerged from pyriproxyfen treated 4 th larval instars. But, it disagreed with Mccluskey et al (1969), who found that starved and untreated male Periplaneta americana responded to sex pheromone till death, and Ali (2010), who found that starvation didn't affect either production or responsiveness to pheromones in both sexes of Attagenus fasciatus.…”

“…Thus, LC 25 oil treated male 4 th larval instars had a greater impact on pheromone-producing glands than treated females. In the same line, in treated sexes, the response of the male was significantly increased with increasing concentrations of female pheromone extract, as observed by El-Barky et al (2012) on Tribolium castaneum adults produced from treated 4 th larval instars by pyriproxyfen.…”

Juvenile Hormone Analogue and Management of Rice Moth, Corcyra cephalonica Staint. (Lepidoptera: Pyralidae)

“…Chandra and Tiwari (2013) examined that 12 and 14 ppm concentration of methoprene (JHA) against 3 rd instar larvae of Almond moth, Ephestia cautella caused 100 % suppression of adult progeny. Our results are in conformity with methoprene and hydroprene treated Tribolium castaneum and Tribolium confusum (Loschiavo, 1977) (Arthur, 2003), pyriproxyfen fed 4 th instar larvae of Tribolium castaneum (El-barky et al, 2012) and pyriproxyfen treated Tribolium granarium (Swidan et al, 2016).…”