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褐飞虱(Nilaparvatazlugens Stal是水稻上的重要害虫,在上海地区不能越冬,每年从热带、亚热带地区通过季风迁入上海。为了掌握褐飞虱的发生动态,指导褐飞虱抗性品种的选育及其防治,我们从1979年开展了对褐飞虱生物型的监测工作。方法是用国际水稻研究所提供的具有不同抗性基因的品种(表1),种在种子箱中,每品种15粒种子,待苗出齐后于一叶一心期去除弱苗,留壮苗10株,二叶一心期按每苗接入5头2～3龄若虫,重复3次,按国际水稻研究所提出的标准评级系统评价各品种对褐飞虱的反应。测定结果见表2。结果表明,1991年以前,褐
Nilaparvata zlugens Stal is an important pest on rice that can not wintering in Shanghai and moves into Shanghai from the tropics and subtropics through monsoon every year.In order to master the dynamics of BPH and guide the breeding of BPH resistant varieties and their control, The monitoring of BPH biotypes was carried out in 1979 by using varieties with different resistance genes (Table 1) from the International Rice Research Institute and planting them in seed boxes with 15 seeds per seed. In a leaf one heart period to remove weak seedlings, stay strong seedlings 10, two leaves one heart per plant access to 5 2 to 3 instar nymphs, repeated 3 times, according to the International Rice Research Institute of the standard rating system to evaluate the variety of Brown planthopper response.The results are shown in Table 2. The results show that before 1991, brown