The Cumulative Effects of Native Isolate of Entomopathogenic Fungus Beauveria Bassaiana on the Developmental Stages of Mosquito (Culex pipiens Linnaeus)

This study was conducted in city of Zakho to assess the biological compoundable of effects for entomopathogenic fungus Beauveria bassaiana on the mosquito (Culex pipiens Linnaeus) employing a different concentration (1 x 103, 2 x 103, 3 x 103, 4 x 103, 5 x 103 & 6 x 103 spore) for all juvenile stages of mosquito. The compoundable effect of the fungal isolate affected the hatchability of eggs significantly; rate of death and elongation of the duration for the larvae and pupae of C. pipiens, where eggs , larval & pupal mortality were concentration dependent. The high concentration (6 x 103 spores) of fungal isolate had significant effects on hatchability of the eggs, larval mortality and pupal mortalities (70.37%), (100%) & (97.5%) respectively. The emergence of adults and the most biological activities of the emerging females including fertility were evidently affected. The adult emergence showed highest rate at the concentration 4 x 103 spores which was 17.54% and the lowest rate of emergence was recorded at the concentration 5 x 103 spores which was 2.5%). The female’s preoviposition period which they were developed from the eggs treated with the fungal isolate, was significantly affected at a concentration of 4000 spores reaching the 7th days. Female fecundity was significantly decreased with increasing concentration of the fungus, and it was found that, at the concentrations of 4000 spores B. bassaiana the females deposited 42 eggs, and the hatching percent of the eggs at the same concentration (4000 spores) was 76.38%.