摘要
斜纹夜蛾幼虫在不同作物上的空间分布特征研究表明 :幼虫在低龄阶段高度聚集 ,聚集的原因是成虫产卵的行为造成。在高龄阶段 ,聚集度下降 ,幼虫不断扩散 ,扩散的原因是密度制约因素引起。在白菜上 ,幼虫在 4龄前为聚集分布 ,5龄以后为均匀分布 ,棉花和向日葵上各龄幼虫均为聚集分布。根据种群空间分布图式 。
The spatial distribution patterns of the larva of Spodoptera litura on the different crops were studied. The results showed that the larvae in early instars were highly aggregate. The cause of aggregation was because of mass oviposition behaviour of adults. Aggregate intensity of larvae in late instars decreased and larvae dispersed gradually. The cause of dispersion was because of the effect factor of density. The larvae before 4th instar were aggregate distribution and after 5th instar were even distribution on chinese cabbage. Each instar larva is aggregate distribution on cotton and sunflower. Based on spatial pattern of popolation, the data transformation formulation was made.
出处
《华东昆虫学报》
2001年第2期66-70,共5页
Entomological Journal of East China
