我们按《扬州市水稻病虫害综合防治》协作组的计划方案,1983年在中熟中籼稻“910”品系上,对二代二化螟田间为害损失作了一些观察。二代二化螟蛾在我县了月中下旬盛发,7月下旬至8月初为幼虫为害盛期。当时水稻“910”正处在拔节末期、孕穗初期,所以幼虫为害以形成枯心白穗为主。在白然落卵的情况下,经过田间调查看出,后期长势较旺的稻田,落卵多,形成的枯心白穗团较大。据46团统计,每团枯心、枯孕穗、白穗和虫伤株为8—48根,平均25.2±10.8根。其中每团被害31根以上的大团占36.4%,16—30根的中团占45.4%,15根以下的小团占18.2%。后期长势一般的稻田,落卵较少,形成的枯心白穗团也小。对40团 According to the plan of the cooperation group of “Integrated Prevention and Control of Rice Plant Diseases and Insect Pests in Yangzhou City”, we made some observations on the field damage of the second generation of rice stem borers in mid-season indica rice “910” lines in 1983. Second generation two moth moths flourished in the late mid-month in my county, from late July to early August for the larvae infested peak. Rice “910” was in the late stage of jointing and early booting, so the larvae were harmed to form the heart of white ear. In the case of sporadic lay eggs, after field surveys show that the late growth of rice paddies, more eggs, the formation of more white braided spit larger. According to the 46 group statistics, each group withered, booting, white spike and insect pest strains for 8-48, an average of 25.2 ± 10.8 roots. Among them, 36.4% of the large groups of more than 31 killed each group, 45.4% of the 16-30 middle groups and 18.2% of the small groups of 15 or fewer. The late growth of the general paddy field, less eggs, the formation of dry white spike is small. On the 40 regiment