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. |
