EVALUATION OF THE EFFECT OF ELEVATED CO2 ON BIOEFFICACY OF BUPROFEZIN INSECTICIDE AGAINST BROWN PLANT HOPPER,  Nilaparvata lugens (STÅL)

Srinivasa  N; Subhash  Chander; Padala Vinod  Kumar

doi:10.18006/2021.9(1).5.11

Authors

Srinivasa N Department of Entomology and Agricultural Zoology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh-221005
Subhash Chander Division of Entomology, Indian Agricultural Research Institute, New Delhi-110012
Padala Vinod Kumar ICAR-Research Complex for Eastern Region, Research Centre for Makhana, Darbhanga Bihar-846007

DOI:

https://doi.org/10.18006/2021.9(1).5.11

Keywords:

Brown plant hopper, Buprofezin, Elevated CO2, Rice, Spray volume, climate change

Abstract

The effect of elevated CO₂(570±25ppm) on the brown plant hopper (BPH) population, rice yield parameters, and efficacy of buprofezin (0.05%) in terms of spray volume was studied in an open top chamber (OTCs) during rainy season 2017 and 2018. The pest population was observed to be higher during 2017 compared to the rainy season of 2018. Under elevated CO_2,rice plants had more vegetative tillers (18%) and reproductive tillers (22.1%), but there was a decrease in 1000-seed weight (11.2%), seed number per panicle (3.91%), and grain yield (18.8%) in comparison to ambient CO₂grown rice plants. The spray volumes of 700, 600, 500, and 400 l/ha each caused higher BPH mortality under ambient CO₂compared to elevated CO₂. A spray volume of 500 l/ha did not prove as effective under elevated CO₂as under ambient CO₂. Lower efficacy of spray volume of 500 l/ha under elevated CO₂could be ascribed to higher canopy size under elevated CO₂ due to higher tillering. Increased crop canopy size under elevated CO₂ may thus require higher spray volume to ensure proper coverage. Results of the study suggested a need to revise spray volume recommendations to facilitate effective management of BPH under climate change.

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