【摘要】 目的】研究2代区第1代二化螟Chilo suppressalis为害对水稻产量的影响。【方法】通过人工接种二化螟黑头卵模拟2代区第1代二化螟为害对水稻产量损失的影响。【结果】2代区第1代二化螟幼虫危害造成水稻枯鞘、枯心和枯死株，致使单位面积有效穗数减少，产量降低。随着接卵量增加水稻被害株率增加，产量损失率增加，接卵量与产量损失率的关系符合方程y=0.039x﹣2.793。根据害虫经济阈值的定义，推算出1代二化螟卵量防治指标为111块/667 m~2，通过分析越冬代性比和雌蛾产卵量数据，提出二化螟成虫防治指标为灯诱累积20.2头或性诱累积8.3头。【结论】明确了1代二化螟卵量和成虫的防治指标，对二化螟的早期防治有重要指导意义。更多还原

【Abstract】 Aim]To determine the loss inflicted on rice crops by the first generation of Chilo suppressalis in two regions.[Methods]The relationship between the occurrence of the first generation of C.suppressalis and crop loss was studied by artificially inoculating rice plants with C.suppressalis egg-masses.[Results]First generation larvae in a second-generation area caused withered sheaths,withered hearts and plant death.As a result,the number of effective panicles per unit area of rice was reduced and yield decreased.The loss rate increased with the number of eggs;the correlation between crop loss and the number of egg-masses per 667 m~2 can be described by the equation:y=0.039x﹣2.793.According to the definition of an economic threshold,the control index for the first generation of C.suppressalis is 111 egg-masses per 667 m~2.By analyzing the sex ratio and oviposition of the overwintering generation,we propose that the control index for adults be set at 20.2 for light trapping,or 8.3 adults for sex-pheromone trapping.[Conclusion]These results provide important information for the early control of C.suppressalis in rice crops.更多还原