Resistance monitoring and field control efficacy of different insecticides on Nilaparvata lugens in Lujiang county,Anhui province
Brown planthopper,Nilaparvata lugens,has developed resistance to many kinds of insecticides.To screen highly effective insecticides against brown planthopper,resistance of triflumezopyrim,dinotefuran,nitenpyram,pymetrozine,and sulfoxaflor against a field population,which collected from Lujiang county,Anhui province,were monitored by the rice stem dipping method from 2020 to 2022.Meanwhile,field trial was carried out to investigate the efficacy of these insecticides against brown planthopper in Lujiang county.Resistance monitoring test showed that Lujiang populations developed high resistance to pymetrozine(RR:104.6-154.4-fold),moderate to high resistance to dinotefuran(RR:77.7-157.2-fold),moderate resistance to sulfoxaflor and nitenpyram(21.3-64.5-fold and 14.6-22.6-fold,respectively),and still kept susceptible to triflumezopyrim.At the recommended high concentration,triflumezopyrim 20％WG and yizuochongmiding 10％SC showed quick and persistent effects on brown planthoppers,except of a 74.72％control efficacy on the first day after treated with triflumezopyrim 20％WG.The control effect of nitenpyram 50％SG and sulfoxaflor 22％SC was the second,67.63％-71.61％control efficacy on the first day,and increased to 77.16％-84.13％at the 3rd day to the 7th day after treatment,but reduced to 71.52％-75.77％on the 14th day.The control efficacy of pymetrozine 50％WG was about 70％at the 1st to the 7th day but decreased to 62.12％at the 14th day.For flonicamid 20％SC,dinotefuran 20％WG and etofenprox 10％SC,the control efficacy kept below 80％from the 1st to the 14th day.Combined with the results of resistance monitoring and field trial efficacy,we concluded that the triflumezopyrim and other mesoionic insecticides could be used alternately with neonicotinoids,pymetrozine or their mixtures for the control of resistant brown planthopper.
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