Journal of Biological Control

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Influence of Varying Temperatures on Toxicity of Biorationals Against Diamondback Moth,Plutella Xylostella L.


Affiliations
1 Department of Agricultural Entomology, Dr. Panjabrao Deshmukh Krushi Vidyapeeth, Akola - 444104, Maharashtra, India
 

Effect of various temperatures on the efficacy of five biorationals, viz. Beauveria bassiana (1.15% WP), Metarhizium anisopliae (1.15% WP), Bacillus thuringiensis (0.5% WP), Azadirachtin (300 ppm) and Spinosad (45 SC) in terms of median lethal concentration (LC<sub>50</sub>) value was evaluated against diamondback moth, Plutella xylostella larvae. The toxicity data for biorationals against P. xylostella on the basis of larval mortality revealed that M. anisopliae (1.15% WP), B. thuringiensis (0.5% WP), Azadirachtin (300 ppm) and Spinosad (45 SC) registered higher effectiveness (lower LC<sub>50</sub> value) at 25(sup>o</sup> C whereas, increase in temperature led to declined efficacy of biorationals; whereas, use of entomopathogenic fungi, B. bassiana (1.15% WP) was most effective at 30<sup>o</sup> C and revealed lower effectiveness (higher LC<sub>50</sub> value) at 25<sup>o</sup> and 35<sup>o</sup> C temperatures. Data on the influence of temperature on toxicity of biorationals to P. xylostella on the basis of adult emergence revealed lowest LC<sub>50</sub> value for B. thuringiensis (0.5% WP) at 25<sup>o</sup> C and the efficacy decreased with increase in the temperature, whereas, M. anisopliae (1.15% WP), B. bassiana (1.15% WP), Azadirachtin (300 ppm) and Spinosad (45 SC) were most effective at 30<sup>o</sup> C and the higher LC<sub>50</sub> value were evident at temperature above 30<sup>o</sup> C, indicating the reduced efficacy of biorationals with increase in temperature beyond 30<sup>o</sup> C or preference for lower temperature regimes under laboratory conditions.

Keywords

Biorationals, Diamondback moth, LC50, temperature regimes.
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  • Influence of Varying Temperatures on Toxicity of Biorationals Against Diamondback Moth,Plutella Xylostella L.

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Authors

A. M. PARIHAR
Department of Agricultural Entomology, Dr. Panjabrao Deshmukh Krushi Vidyapeeth, Akola - 444104, Maharashtra, India
D. B. UNDIRWADE
Department of Agricultural Entomology, Dr. Panjabrao Deshmukh Krushi Vidyapeeth, Akola - 444104, Maharashtra, India
R. M. WADASKAR
Department of Agricultural Entomology, Dr. Panjabrao Deshmukh Krushi Vidyapeeth, Akola - 444104, Maharashtra, India
S. S. MADANKAR
Department of Agricultural Entomology, Dr. Panjabrao Deshmukh Krushi Vidyapeeth, Akola - 444104, Maharashtra, India

Abstract


Effect of various temperatures on the efficacy of five biorationals, viz. Beauveria bassiana (1.15% WP), Metarhizium anisopliae (1.15% WP), Bacillus thuringiensis (0.5% WP), Azadirachtin (300 ppm) and Spinosad (45 SC) in terms of median lethal concentration (LC<sub>50</sub>) value was evaluated against diamondback moth, Plutella xylostella larvae. The toxicity data for biorationals against P. xylostella on the basis of larval mortality revealed that M. anisopliae (1.15% WP), B. thuringiensis (0.5% WP), Azadirachtin (300 ppm) and Spinosad (45 SC) registered higher effectiveness (lower LC<sub>50</sub> value) at 25(sup>o</sup> C whereas, increase in temperature led to declined efficacy of biorationals; whereas, use of entomopathogenic fungi, B. bassiana (1.15% WP) was most effective at 30<sup>o</sup> C and revealed lower effectiveness (higher LC<sub>50</sub> value) at 25<sup>o</sup> and 35<sup>o</sup> C temperatures. Data on the influence of temperature on toxicity of biorationals to P. xylostella on the basis of adult emergence revealed lowest LC<sub>50</sub> value for B. thuringiensis (0.5% WP) at 25<sup>o</sup> C and the efficacy decreased with increase in the temperature, whereas, M. anisopliae (1.15% WP), B. bassiana (1.15% WP), Azadirachtin (300 ppm) and Spinosad (45 SC) were most effective at 30<sup>o</sup> C and the higher LC<sub>50</sub> value were evident at temperature above 30<sup>o</sup> C, indicating the reduced efficacy of biorationals with increase in temperature beyond 30<sup>o</sup> C or preference for lower temperature regimes under laboratory conditions.

Keywords


Biorationals, Diamondback moth, LC50, temperature regimes.

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DOI: https://doi.org/10.18311/jbc%2F2021%2F27761