摘要
调查了不同类型稻田及茭白田中二化螟的越冬年龄结构 ,比较了不同龄期幼虫之间在冬后取食与化蛹动态方面的差异。结果表明 ,越冬虫龄以双季晚稻田中明显较低 ,中稻田与茭白田中相对较高。出现取食的个体比例在 4 - 5龄幼虫之间差别不大 ;但取食的开始时间在龄期之间具明显差异 ,以 4龄个体最早取食。未取食个体的化蛹进度明显快于取食个体 ;未取食个体中以 4龄幼虫的化蛹时间较早。
The age structure of striped stem borer, Chilo suppressalis, overwintering in different type of rice fields and wild rice fields was investigated, and post winter feeding and pupation dynamics were compared among larvae in different instars. The results showed that the ages of larvae in fields of 2nd season rice were obviously lower than those in fields of single season rice and wild rice. There was no significant difference in proportions of post winter feeding individuals among 4th, 5th and 6th instar larvae. However, the initiation time of post winter feeding was obviously different among these instars, larvae in 4th instar beginning feeding earliest. The larvae without feeding pupated greatly earlier than those feeding, and feeding individuals in 4th instar pupated earlier than those in other instars.
出处
《华东昆虫学报》
2000年第2期72-76,共5页
Entomological Journal of East China
基金
瑞士发展与协作机构基金"IRRI Rice IPM Network"资助项目
关键词
二化螟
越冬种群
年龄结构
取食
化蛹
Chilo supressalis
overwintering population
feeding
pupation dynamics
