Randeep kr Kushwaha*, Sanjay Sharma1 and Vijay Kr Koshta2
Department of Entomology, CoA, IGKV, Raipur, Chhattisgarh, India- 492 012
Email: rndp2010@gmail.com
Received-04.10.2019, Revised-22.10.2019
Abstract: Monitoring of insecticide resistance on brown planthopper, Nilaparvata lugens Stal. population of prone area in Chhattisgarh plain was carried out during kharif 2009 and 2010. The field collected insects were reared for 5 generations in Entomology greenhouse before conducting toxicity tests. Susceptibility of 7-9 day old nymphs was assessed by spraying the commercial formulations of different group of insecticides at various concentrations on TN-1 plants upto runoff stage and observed the mortility after 24, 48 and 72 hrs. of spraying.The level of insecticide resistance in field population of percent mortalitypresented in form of resistance ratio (RR)(mortality of field population(RRR& RRD)/mortality of greenhouse population) was worked out.During 2009, the highest RRof Raipur and Dhamtari BPH population was noticed (1:0.22) and (1:0.04)in buprofezin, respectively and lowest in chlorpyriphos + cypermethrin and fipronil (1:1.0) in Raipur whileDhamtari in fipronil.During 2010, the maximum RR of Raipur and Dhamtari population was recorded (1:0.15) and (1:0.04)in cypermethrin and buprofezin, respectively However, minimum population of Raipur BPH was(1:1.0)in fipronil and carbaryl and (1:0.98)in Dhamtari, respectivelywithin 72 hrs. of spraying.On the basis of two years pooled mean, the maximum RR of Raipur BPH was noticed (1:0.27) in cypermethrin whileDhamtariin buprofezin followed by imidacloprid (1:043), respectively. Whereas, the minimum population of Raipur exhibited in carbaryl (1:097)andDhamtari (1:098)in fipronil within 72 hrs. of spraying.TheRR indicates that the minimumwas observed in buprofezin followed bycypermethrinand imidacloprid. On the basis of information generated on field population of BPH revealed that it had developed considerable level of resistance against buprofezin,cypermethrin and imidacloprid. However, buprofezin is having different mode of action for controlling of BPH.
Keywords: Rice, newer insecticides, insecticide resistance, relative efficacy of insecticide, Nilaparvata lugens
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