Abstract
Chlorfluazuron (Atabron) is an insect growth regulator (IGR) belongs to benzoylphenyl urea for controlling the major insect pests. The present work aims to investigate the toxicological and biological effects of Chlorfluazuron on the 4th larval instar of rust red flour beetle, Tribolium castaneum at different concentrations (0.1, 0.5, 1, 5 and 10 ppm) under laboratory conditions. The results revealed high significant mortality in larvae, pupae and adults. The obtained results showed significant decrease in adult emergence, fecundity and fertility. Chlorfluazuron caused also a significant prolongation in larval and pupal developmental period. When 4th larval instar treated with LC50 value of Chlorfluazuron (1.2ppm) female production and male's perception to pheromone affected. The results indicated that both treated and untreated sexes of the rust red flour beetle could secrete a pheromone that was able to stimulate the opposite sex as well as its own sex. Although production and responsiveness of pheromone in untreated groups were significantly higher than treated one. Females secreted a pheromone that stimulated males is sex pheromone. While the pheromone secreted by males is an aggregation pheromone. Production and responsiveness to pheromone in untreated virgin sexes was significantly higher than treated one at photophase and scotophase. The maximum production and perception of pheromone in untreated sex were at 15.00 p.m. While a peak in treated one was at 13.00p.m.
Highlights
The rust red flour beetle, Tribolium castaneum (Herbst), is one of the serious pests of flour and other cereal products in Egypt
Chlorfluazuron is a noval chitin synthesis inhibitor that belongs to the benzoylphenyl ureas (BPUs) and acts as an anti-molting agent, inhibit biosynthesis of chitin of an important constituent in insect cuticle, loses cuticle elasticity and causing abnormal endocuticular deposition and abortive molting (Dhadialla et al, 2005)
Bioassay test: A preliminary experiment was carried out to determine the effect of different concentrations (0.1, 0.5, 1, 5 and 10 ppm) of chlorfluazuron as a chitin synthesis inhibitor against T. castaneum
Summary
The rust red flour beetle, Tribolium castaneum (Herbst), is one of the serious pests of flour and other cereal products in Egypt. IGR was introduced to describe a new class of bio-rational compounds through greater selectivity of action. IGRs have very low toxicity to mammals and other non-target organisms and, usually, are rapidly degraded in the environment (Kostyukovsky et al, 2000). These characteristics make IGRs potential alternatives to conventional insect pest. Chlorfluazuron (atabron) is a noval chitin synthesis inhibitor that belongs to the benzoylphenyl ureas (BPUs) and acts as an anti-molting agent, inhibit biosynthesis of chitin of an important constituent in insect cuticle, loses cuticle elasticity and causing abnormal endocuticular deposition and abortive molting (Dhadialla et al, 2005)
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