Efficacy of Three Bioinsecticide and A methomyl Insecticide Against Cotton Leafworm Larvae, Spodoptera littoralis under Controlled Semi-field Conditions at El-Behara Governorate

Abd El-Kareem, Sara M. I.

doi:10.21608/eajbsf.2016.17111

	Efficacy of Three Bioinsecticide and A methomyl Insecticide Against Cotton Leafworm Larvae, Spodoptera littoralis under Controlled Semi-field Conditions at El-Behara Governorate
Egyptian Academic Journal of Biological Sciences, F. Toxicology & Pest Control
Article 2, Volume 8, Issue 2 - Serial Number 1, December 2016, Page 13-18 PDF (320.76 K)
Document Type: Original Article
DOI: 10.21608/eajbsf.2016.17111
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Author
Sara M. I. Abd El-Kareem
Cotton Leafworm Research Department, Plant Protection Research Institute, Dokki, Giza, Egypt
Abstract
In order to evaluate the effect of time elapse and field conditions on the efficacy of three bioinsecticides and a methomyl insecticide against cotton leafworm, Spodoptera littoralis, 2^nd and 4^th instar larvae, a semi-field experiment was designated. The study was carried out throughout 2015 and 2016 growing seasons at El-Dakhaly village, the western side of Rashid branch, Kom Hamada Center, Beheira Governorate. Obtained results showed gradual increased mortality rates when 2^nd and 4^th instar larvae of S. littoralis fed on treated cotton leaves with LC₅₀ of tested bioinsecticides until reaching the 5^th day post application. Starting from the 6^th day post application a gradual increased larval mortality rates were observed in both 2^nd and 4^th instar larvae in both growing seasons. Obtained data also showed gradual decrease in mortality rates was observed along nine days post application with LC₂₅ of Kuik^® in both 2015 and 2016 growing seasons.
Keywords
Cotton leafworm; Spodopteralittoralis; semi-field conditions; Methomyl; Kuik® bioinsecticides; Btk; Sli NPV


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