水稻主要害虫对再生稻产量的影响OA

Ratoon rice,recognized as a green and sustainable"one-planting,two-harvests"cultivation system,is severely threatened in its healthy development by Nilaparvata lugens Stål,Chilo suppressalis Walker,and Cnaphalocrocis medinalis Guenée.Clarifying the yield loss rate caused by these pests is an important basis for formulating pest control thresholds.Field cage inoculation experiments were conducted in Yong'an town,Changsha county from 2022 to 2024 to investigate the effects of different inoculation densities of the three pests on ratoon rice yield.The results showed that the population of N.lugens began to increase rapidly 35 days after inoculation.An inoculation density above 800 individuals per 100 hills easily triggered hopperburn,with yield loss up to 92％.The damage rate of C.suppressalis was significantly positively correlated with inoculation density(P＜0.01).An inoculation density of ≥ 15 individuals per 100 hills significantly reduced rice yield,and 30 individuals per 100 hills caused a yield reduction of more than 21％.Although C.medinalis caused a leaf rolling rate higher than 50％,it had no significant effect on rice yield.Therefore,population densities of N.lugens and C.suppressalis should be reduced timely in practical production to support stable and high yield of ratoon rice.