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抗性鉴定结果表明 ,川棉 2 43对棉铃虫属Ⅱ级抗性水平 (抗 )。叶片少毛是川棉 2 43的一个形态学方面的抗性特征 ,由于叶片正面叶脉茸毛密度低、叶肉不着生茸毛 ,因此川棉 2 43棉株上棉铃虫落卵量分别较常规品种川棉 5 6和中12的低 39.0 %和 2 7.7%。由于体内富含有毒次生代谢物质棉酚和单宁 ,使川棉 2 43具有生化抗性 ,棉铃虫幼虫对其取食的趋性弱、取食量小 ,取食后生长发育受阻、种群存活率与生殖力下降 ,种群增长指数分别较取食中 12和中无 15 1的低 39.4%和 5 2 .6 %。在棉铃虫中等程度发生年份 ,种植川棉 2 43至少可减少用药防治 2次
Resistance identification showed that Chuanmian 2 43 had a Ⅱ level resistance (resistance) to H. armigera. As a morphological resistance trait of Chuanmai243, the leaf hairs lacked hair and hairs due to the low density of leaf veins on the frontal leaves. 39.0% and 2 7.7% lower for 5 6 and medium 12 respectively. As the body is rich in toxic secondary metabolites gossypol and tannin, so that Sichuan cotton 423 biochemical resistance, cotton bollworm larvae feeding their tendency is weak, small amount of food intake, growth and development after the obstruction blocked, the population The survival rate and fecundity decreased. The population growth index was 39.4% and 52.6% lower than that of 12 and 15 1 respectively. In the mid-year of occurrence of H. armigera, cultivation of Sichuan cotton 2 43 at least reduce the prevention and treatment of medication 2