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棉铃虫Heliothis armigera(Hubner)是我国棉区重要害虫。二代是华北棉区当前重点防治世代。近年来,棉铃虫种群有上升趋势,以百株15粒卵或5头以上小幼虫为二代经济阈值(防治指标)导致大量施药,引起了一系列严重的经济生态学问题。为了部分地解决这一问题,在前人工作的基础上,1980—1982年我们在河北省饶阳县、1982年在安徽省濉溪县,通过对不同肥水条件下种植的陆地棉Gossypiumhirsutum L.衡棉1号、鲁棉1号、乌干达3号、
Heliothis armigera (Hubner) is an important pest in cotton area in China. The second generation is the current focus of prevention and control in North China cotton generation. In recent years, the population of Helicoverpa armigera has an upward trend. With the economic threshold of more than 15 eggs or 5 small larvae as the second generation (prevention and control index), a large number of pesticides have been applied, causing a series of serious economic and ecological problems. In order to partially solve this problem, on the basis of previous work, from 1980 to 1982 in Raoyang County of Hebei Province and in Taixi County of Anhui Province in 1982, we conducted a survey on the soil fertility of Gossypium hirsutum L. Cotton 1, Lumi Cotton 1, Uganda 3,