棉铃虫寄主潜在适合度表达的影响因素研究

Studies on the Expression Rate of Potential Fitness for Host Crops to Cotton Bollworm and Its Effect Factors

通过大面积分类系统调查、田间自然为害试验与罩笼接蛾试验 ,对棉铃虫主要寄主潜在适合度表达的影响因素进行了研究。结果表明 :主要寄主作物对棉铃虫的潜在适合度的表达程度都以生殖生长阶段优于营养生长阶段 ,不同生育期之间都以开花期适合度最高。影响同一寄主作物适合度的主要因素除生育期以外 ,还有品种抗性、寄主生长势、棉铃虫发生代次与种群数量、环境气候因素与作物布局等。感虫品种、寄主生长势强、棉铃虫主害代与发生基数大、环境气候适宜等 ,棉铃虫寄主适合度表达程度就高。据此 。

With the methods of fields system atic investigation, field trial and confining moth in cage planting host crops, authors studied the expression rate of potential fitness for host plants to cotton bollworm and its effect factors. Results show that the fitness in reproductive growth phase for mainly host crops to cotton bollworm is larger than the ones in nutrition growth phase, and the value of fitness in flowering stage is the highest among different growth stages. Besides this, the factors such as variety resistance to cotton bollworm, growth condition of cotton, generation and occurring number of cotton bollworm, climate status, crop deployment and so on affect the potential fitness expression rate too. In the case of susceptible variety, high output, mainly damage generation and more occurring number of cotton bollworm, beneficial climate status to cotton bollworm, the expression degree of fitness to cotton bollworm for host crop will be high. Results of this study are available for optimizing the forecast and control techniques of this insect pest.