TITLE

Toxicological Evaluation of Selected Biopesticides and One Essential Oil in comparison with Indoxacarb pesticide on Cotton leafworm, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae) under laboratory Conditions

AUTHOR(S)
El-Geddawy, Abdel Rahman M. H.; Ahmed, Mohamed A. I.; Mohamed, Samy H.
PUB. DATE
February 2014
SOURCE
American-Eurasian Journal of Sustainable Agriculture;Feb2014, Vol. 8 Issue 2, p58
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The Cotton leafworm, Spodoptera littoralis (Boisd.) is considered one of the highly destructive insect pests in Egypt. In this study, we evaluate selected biopesticides [Emamectin benzoate (5% SG), Azadirachtin (0.03% EC), Beauveria bassiana (1*108 conidial /ml³), and Azadirachtin (0.03% EC)] and one essential oil [Black pepper extract] in comparison with one chemical pesticide [Indoxacarb (15% SC)] on the second and fourth instar larvae of Spodoptera littoralis. However, Emamectin benzoate (5% SG) is the most potent compound among the tested compounds followed by Azadirachtin (0.03% EC), Black pepper extract, Beauveria bassiana (1*108 conidial /ml³), Indoxacarb (15% SC), and Spinetoram (12% SC) compounds. Further, the toxicity increased dramatically after 48 h and continues increased after 72 h comparing to 24 h data especially for Emamectin benzoate (5% SG) and Indoxacarb (15% SC) on second and fourth instar larvae. Moreover, according to the toxicity index, Emamectin benzoate (5% SG) is the most toxic compound (100%) followed by Azadirachtin (0.03% EC), Black pepper extract, and Beauveria bassiana (1*108 conidial /ml³) which observed after 24 h exposure for both second and fourth instar larvae, in contrast, these results have been slightly changed after 48 and 72 h exposure. Importantly, the tolerance ratio (TR) ranged from 1.32 and 11.00 based on the 24, 48, 72 h exposure results. Accordingly, utilization of these biocontrol agents for controlling the Cotton leafworm provides a promising alternative to conventional insecticides in Egypt.
ACCESSION #
97094743

 

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