The Relative Potency of some Pesticides against Cotton Leafworm, Spodoptera littoralis (Boisd.) and their Side Effect on the Natural Enemy, Chrysoperla carnea (Stephens)
Abdullah, R. (2021). The Relative Potency of some Pesticides against Cotton Leafworm, Spodoptera littoralis (Boisd.) and their Side Effect on the Natural Enemy, Chrysoperla carnea (Stephens). EKB Journal Management System, 12(3), 245-250. doi: 10.21608/jppp.2021.157399
Reda R Abdullah. "The Relative Potency of some Pesticides against Cotton Leafworm, Spodoptera littoralis (Boisd.) and their Side Effect on the Natural Enemy, Chrysoperla carnea (Stephens)". EKB Journal Management System, 12, 3, 2021, 245-250. doi: 10.21608/jppp.2021.157399
Abdullah, R. (2021). 'The Relative Potency of some Pesticides against Cotton Leafworm, Spodoptera littoralis (Boisd.) and their Side Effect on the Natural Enemy, Chrysoperla carnea (Stephens)', EKB Journal Management System, 12(3), pp. 245-250. doi: 10.21608/jppp.2021.157399
Abdullah, R. The Relative Potency of some Pesticides against Cotton Leafworm, Spodoptera littoralis (Boisd.) and their Side Effect on the Natural Enemy, Chrysoperla carnea (Stephens). EKB Journal Management System, 2021; 12(3): 245-250. doi: 10.21608/jppp.2021.157399

The Relative Potency of some Pesticides against Cotton Leafworm, Spodoptera littoralis (Boisd.) and their Side Effect on the Natural Enemy, Chrysoperla carnea (Stephens)

Journal of Plant Protection and Pathology
Article 12, Volume 12, Issue 3, March 2021, Page 245-250  XML PDF (867.48 K)
Document Type: Original Article
DOI: 10.21608/jppp.2021.157399
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Author
Reda R Abdullah email
plant protection research institute, Agriculture research center, Dokki, Giza
Abstract
The cotton leafworm, Spodoptera littoralis (Boisd.) is one of the dangerous economic insects on different crops in Egypt because it causes more damages in crops especially cotton and leafy vegetables. On the other hand, the natural enemy, Chrysoperla carnea (Stephens) is an important predator in all fields because it is able to control many insect pests and mites. In this study, six commercial pesticides (Chlorpyrifos, Alpha-cypermethrin, Methomyl, Abamectin, Biossiana, and Dipel) and two new compounds under the study (Crude extract of Beauveria bassiana metabolites and synthesis compound from Cyanoacetamide derivatives) were tested to determine their toxicity against the 2nd instar larvae of S. littoralis and their side effects against the 2nd instar larvae of C. carnea. All tested compounds had different degrees of toxicity against both tested insects. Based on the values of LC50 , toxicity index and relative potency, Alpha-cypermethrin was the highest toxic pesticide against S. littoralis and C. carnea followed by Methomyl and Chlorpyrifos but Biossiana was the least toxic one. In addition, the toxicity of tested chemical pesticides against C. carnea was more than their toxicity against S. littoralis. While, the toxicity of tested biopesticides against C. carnea was less than their toxicity against S. littoralis. In general, the sensitivity of the predator C. carnea to the tested biopesticides was less in comparison with chemical pesticides. Therefore, this study recommends using biopesticides besides the slight using of chemical pesticides to preserve the natural enemies and environment and achieve the best pest control. 
Keywords
Toxicity index; Insecticidal activity; Biopesticides; Chemical pesticides
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