春季不同出土时间大猿叶虫寿命和生殖力的比较

大猿叶虫Colaphellus bowringi是十字花科蔬菜上的重要害虫,在田间,该虫的繁殖期出现在春季和秋季,以成虫在土中越夏和越冬。本试验在20℃,光周期L︰D=12︰12条件下,详细比较了大猿叶虫龙南种群春季不同出土时间成虫寿命和产卵量。结果显示：2月出土雌雄成虫寿命明显短于3月出土成虫,日平均产卵量差异不显著,总产卵量由于寿命的影响也显著低于3月出土成虫。这一结果显示同一个季节中大猿叶虫早期出土成虫的比晚期出土的成虫适应性差。

A Comparison of Longevity and Fertility between the Post-Diapause Adults with Different Emerge Time in Spring in the Cabbage Beetle, Colaphellus bowringi

The cabbage beetle, ColapheIlus bowringi Baly is a serious pest of crucifers. There are two distinct infestations in the field, one occurs in spring, another in autumn. The beetle aestivates and hibernates as an adult in the soil. In the present study, the longevity and egg production between the adults with different emerge time in spring were compared at 20℃, LD 12：12. The results showed that the longevity of both male and female adult emerged in February were significantly shorter than the adult emerged in March. There was no significant difference in the mean daily egg production between the two treatments. However, mean egg production of females emerged in March was significantly higher than that of females emerged in February because the impact of longevity, The result suggests that early emerged adult of Colaphellus bowringi has a weaker adaptation than the lately emerged adult in the same season.