不同类型棉花品种对扶桑绵粉蚧个体发育特征及其适应性的影响

 研究了转基因、非转基因等6个不同棉花品种以及棉叶中可溶性糖、可溶性蛋白、棉酚含量对扶桑绵粉蚧生长发育、繁殖特性的影响，结果表明：扶桑绵粉蚧在各品种棉花上都能危害，且在发育历期、产卵量和存活率等方面均存在明显差异。中棉所41上扶桑绵粉蚧产卵量、寿命、净增殖率R₀、内禀增长率r_m与周期增长率λ数值最大，种群加倍时间DT值最小，为该虫最适宜棉花品种；而中棉所59上产卵量、寿命、R₀、r_m、λ值最小，死亡率与DT值最大，为该虫最不适宜品种。嫩叶棉酚含量与2龄若虫历期成极显著正相关，棉酚含量与扶桑绵粉蚧寿命、产卵量显著负相关，表明棉酚对扶桑绵粉蚧生长发育有重要影响，并对该虫繁殖、存活能力有一定抑制作用。

Ontogenesis and Adaptability of Mealybug Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) on Different Varieties of Cotton

The ontogenesis of the cotton mealybug Phenacoccus solenopsis feeding on six varieties of transgenic or non-transgenic Bt cotton was investigated. Correlations between the development and reproduction of Ph. solenopsis and the amounts of soluble sugar, soluble protein and gossypol in cotton were also analyzed. The results showed that the cotton mealybug could complete its life cycle on both transgenic and non-transgenic cotton plants, but there were significant differences among the six cotton varieties in the development time, fecundity, and mortality of Ph. solenopsis. Variety CCRI 41 was the best for cotton mealybug, which had the best fecundity, longevity, net reproductive rate(R₀), intrinsic rate of increase(r_m), and finite rate of increase(λ) and the lowest doubling time(DT) on this strain. In contrast, CCRI 59 was the most unsuitable variety for cotton mealybug, which had the lowest fecundity, longevity, R₀, r_m, and λ and the highest mortality and DT on this cultivar. There was a positive correlation between gossypol content of tender leaves and the duration of 2^nd instar nymphs and negative correlations between gossypol content of both tender and mature leaves and adult longevity and fecundity, which implied that gossypol slowed the growth and development of Ph. solenopsis and inhibited both reproduction and survival of the mealybug.