摘要
运用通径分析法探讨了影响第2代玉米螟种群动态的影响因素 ,结果证明 ,影响第2代玉米螟幼虫发生量的关键因素首先是7月26日至31日的降水日数 ,降水日数长短与第2代玉米螟幼虫发生为害程度呈负相关 ;其次为卵期赤眼蜂的寄生率 ,该因素是控制第2代玉米螟种群数量的关键因素之一。
Factors of affecting the population fluctuation of the second-generation Asian maize borer were studied with path analysis method. Before egg laying, the rainday duration on the last six days in July was the most key factor. The longer rainday on the last six days in July was, the less of the number of the second-generation larvae was. From the beginning to the end of egg laying, the key factor was the parasite of trichogramma. The average rate of parasite per year was above 80 percent. In some years, the rate could exceed by 90 percent. Generally, the precipitation in August was suitable for the second-generation Asian maize borer.
出处
《沈阳农业大学学报》
CAS
CSCD
2000年第5期448-450,共3页
Journal of Shenyang Agricultural University
基金
国家"九五"科技攻关专题! (960050103)
辽宁省科委"赤眼蜂工厂化技术研究"课题
