الفهرس | Only 14 pages are availabe for public view |
Abstract The thesis aimed to throw some light on the toxicological, biochemical and histopathological effect of Malathion (organophosphorus insecticide) and Spinosad (biopesticide derived from metabolites of the actinomycete bacterium (Saccharopoly spora spinosa) on the peach fruit fly in laboratory. The obtained results are summarized as follows: I-Insecticidal effect of Malathion and Spinosad on the peach fruit fly, B. zonata (Saunders). Data indicated that Malathion and Spinosad proved high insecticidal activities on B. zonata. Spinosad had more potency than Malathion. Malathion and Spinosad showed moderate insecticidal effect on pupal stage with considerable number of obvious malformations. The two evaluated compounds had high insecticidal activities on adult than pupae. This indicated that pupal stage was more tolerant to insecticides than adult stage. Based on LC50 values results indicated that females were more resistant to the two insecticides than males. Also, Malathion and Spinosad were more effective by using residual thin film than feeding method. The resistance ratio (RR) to Spinosad in field population higher than in case of Malathion compared with the lab strain. However, in comparing LC50 of the fifth generation of resistant strains with that of parent insects produced a higher RR in Malathion than Spinosad. This indicates that it is likely that peach fruit flies with resistance to Malathion also have higher potential to develop resistance to Spinosad. |