Document Type : Original Article
Authors
1
Entomology Department, Faculty of science, Al-Azhar University (Girl branch)
2
Plant protection research Institute, ARC, Dokky Giza
3
Plant protection research Institute, ARC, Dokky Giza.
Abstract
In the present study, newly hatched larvae of Pectinophora gossypiella, (Lab. Strain) were treated with LC20 values of six insecticides (lambda-cyhalothrine, Mineral oil masrona, indoxacarb, emamectin benzoate, Microbial pesticides Bacillus thuringiensis and chlorfluazuron) (0.0846, 16548.017, 45.252, 0.154, 16043.16 and 3.0178 ppm respectively), to study their effects on duration of larval, pupal, total immature stages and longevity, fecundity and fertility of resulted adults.
The obtained results clear that the larval period prolonged to 21.67, 18.27, 20.42, 15.84, 23.50 and 19.65 days compared to 14.63 days in control; while, pupal period estimated by 10.67, 9.97, 9.27, 13.04, 9.1, 11.86 and 8.84 days in treatments and control, respectively. On the other hand, the adult stage resulted from treated larvae was highly affected by all used compounds. The respective fecundity was reduced to 122.82, 139.51, 134.31, 85.74, 183.7 and 173.57eggs /female for lambda-cyhalothrine masrona, indoxacarb, emamectin benzoate, B. thuringiensis and chlorfluazuron treatments compared to 262.48eggs/♀ in control. The percentages of hatchability were 38.06, 53.43, 65.00, 56.29, 48.65 & 78.97, respectively compared with 96.45 % in control
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