棉铃虫严重为害苹果树柴全喜，张娟，张彦武（河北省城市职教中心０５２１６０）棉铃虫是棉花、小麦、花生、番茄等农作物的主要害虫。近年来随着农业生态结构的变化，棉铃虫为害果树呈逐年加重趋势。据调查，１９９１年我市苹果园只是轻度发生。１９９３年一般果园果实被... Cotton bollworm severely harms apple trees Chai Xi, Zhang Juan, Zhang Yanwu (Hebei City Vocational Education Center 052160) Cotton bollworm is a major pest of cotton, wheat, peanut, tomato and other crops. In recent years, with the change of agricultural ecological structure, the damage of the cotton bollworm tree is increasing year by year. According to the survey, in 1991, apple orchard in our city only occurred mildly. 1993 Orchard fruit is ...