Ecological Studies on Anagrus incarnatus Haliday (Hymenoptera : Mymaridae), an Egg Parasitoid of the Rice Planthoppers" : II. Spatial Distribution of Parasitism and Host Eggs in the Paddy Field

Sujin Chantarasa-ard, Yoshihiro Hirashima, Tadashi Miura
1984 Journal of the Faculty of Agriculture Kyushu University  
Spatial distribution of parasitism by Anugrus imarnatus and that of the rice planthopper eggs were investigated by using Iwao's (19F8) method of A-m relationship. The spatial patterns of the host eggs as well as that of parasitism were found to be overdispersed with an aggregative tendency. The relationship between individual host eggs and egg-masses parasitized by A. izcarnatus showed a highly positive correlation. But the intensity of parasitism with respect to the host eggmass size showed a
more » ... endency of an inverse density dependent relationship between per cent parasitism and host density per patch.
doi:10.5109/23795 fatcat:b2mghz7hcfbrta5zwfgoif4you