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对苏北沿海地区 1980～ 1999年各年份棉田二代、三代玉米螟发生基数、卵量和危害程度进行调查与统计 ,总结了近 10a玉米螟暴发出现的新特点。猖獗因子分析表明 :寄主面积的变化、玉米品种的更替、栽培新技术的应用、天敌寄生率的下降和农药的兼治是玉米螟暴发的主要原因
Based on surveys and statistics on the occurrences, numbers and damages of the second and third generations of cotton borers in the coastal areas of northern Jiangsu from 1980 to 1999, the new characteristics of the occurrence of the maize borer in the last 10 years were summarized. Rampant factor analysis showed that the main reason for the outbreak of maize borer was the change of host area, the replacement of maize varieties, the application of new cultivation techniques, the decrease of parasitoids and the control of pesticides