International Journal of Plant Protection

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Seasonal Incidence and Efficacy of Certain Low Risk Insecticides against amarasca Devastans distant on Brinjal


Affiliations
1 Department of Entomology, College of Agriculture, Acharya N.G. Ranga Agricultural University, Rajendranagar, Hyderabad A.P., India
2 Department of Entomology and Agricultural Zoology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi U.P., India
3 Department of Horticulture, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi U.P., India
     

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A field experiment was conducted to study the seasonal incidence and efficacy of certain low risk newer insecticides against Amarasca devastans on brinjal. The peak incidence ofA. devastans was recorded during last week of October 2011 and in which the incidence had non-significant relationship with abiotic factors like maximum temperature, minimum temperature, relative humidity and rainfall but significant relationship with biotic factors like coccinellid beetles as well as spiders. Regarding the efficacy of insecticides, the results indicated that new group of insecticides like neonicotinoids showed higher efficacy in controlling A. devanstans population. Among all the treatments, imidacloprid 17.8 % SL and thiamethoxam 25 WG were highly effective in reducing the population of A. devastans on brinjal. Other combination treatments like azadirachtin + imidacloprid, azadirachtin + thiamethoxam, azadirachtin + spisosad, and azadirachtin + triazophos showed moderate efficacy in reducing the A. devastans population.

Keywords

A. Devastans, Seasonal Incidence, Insecticides, Brinjal
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  • Seasonal Incidence and Efficacy of Certain Low Risk Insecticides against amarasca Devastans distant on Brinjal

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Authors

S. Omprakash
Department of Entomology, College of Agriculture, Acharya N.G. Ranga Agricultural University, Rajendranagar, Hyderabad A.P., India
S. V. S. Raju
Department of Entomology and Agricultural Zoology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi U.P., India
M. Sunil Kumar
Department of Horticulture, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi U.P., India

Abstract


A field experiment was conducted to study the seasonal incidence and efficacy of certain low risk newer insecticides against Amarasca devastans on brinjal. The peak incidence ofA. devastans was recorded during last week of October 2011 and in which the incidence had non-significant relationship with abiotic factors like maximum temperature, minimum temperature, relative humidity and rainfall but significant relationship with biotic factors like coccinellid beetles as well as spiders. Regarding the efficacy of insecticides, the results indicated that new group of insecticides like neonicotinoids showed higher efficacy in controlling A. devanstans population. Among all the treatments, imidacloprid 17.8 % SL and thiamethoxam 25 WG were highly effective in reducing the population of A. devastans on brinjal. Other combination treatments like azadirachtin + imidacloprid, azadirachtin + thiamethoxam, azadirachtin + spisosad, and azadirachtin + triazophos showed moderate efficacy in reducing the A. devastans population.

Keywords


A. Devastans, Seasonal Incidence, Insecticides, Brinjal