Ecofriendly Control of the Pink Bollworm, Pectinophora gossypiella (Saunders) (Lepidoptera: Gelechiidae) by Using Chitosan and Spinosad

Document Type : Original Article

Authors

1 Zoology and Entomology Department, Faculty of Science, Al-Azhar University, Nasr City, Cairo, Egypt.

2 Egyptian Atomic Energy Authority

3 Biological and Agricultural Research Division, Department of Pests and Plant Protection, National Research Center, Giza, Egypt.

Abstract

This study was conducted to assess the susceptibility of the 4th instar larvae of Pectinophora gossypiella to different concentrations (0.01, 0.05, 0.1, 0.5, 1, 5, and 10%) of chitosan and spinosad by the application of two treatment tactics on the control of 4th larval instar of P. gossypiella. Also, an investigation of the impact of sub-lethal dose LC50 on the reproductive potential of insects was determined. The mortality percent was 46.7% when the larvae were fed on artificial medium mixed with chitosan powder, while was 73.3 % when the larvae were fed on artificial medium mixed with chitosan dissolved in 2ml of glacial acid at the highest concentration of 10% after 6 days post-treatment. On the other hand, the first feeding tactic of spinosad induced 100% larval mortality, while the second spraying tactic induced 66.7% larval mortality at the concentration level of 10% after 6 days post-treatment. There was a reduction in the fecundity, hatchability %, and the resulting adult percent where the adult emergence was 61.9 and 59.9 % at the dose level LC50 of chitosan and spinosad, respectively compared to 97.6 % for control. Also, the growth rate of both larvae and the pupae is decreased in spinosad and chitosan compared to the control. We conclude this sub-lethal dose LC50 of chitosan and spinosad is recommended for establishment in the control of P.gossypiella.

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