Study on the Parasitism of Trichogramma ostriniae on Rice Moth Eggs with Different Distribution Patterns
The Trichogramma ostriniae,an excellent egg parasitoid of the Asian corn borer,exhibits preference in parasitism influenced by the distribution patterns of host eggs.To clarify the impact of different spatial patterns and arrangements of host eggs on the parasitism preferences of T.ostriniae,this study compared the parasitism behavior of T.ostriniae on rice moth eggs positioned at the top,side,and bottom,as well as the differences in parasitism when fresh and old rice moth eggs were arranged in mosaic or spaced patterns.Results showed that T.ostriniae would tend to initiate parasitism on eggs located nearby during host searching.Moreover,when the emergence point of the parasitoid and the position of host eggs were both at the top or bottom of the inoculation area,the parasitism rates were relatively higher,at 49.42%and 68.58%,respectively.In the mosaic arrangement of fresh and old eggs,the proportion of parasitized eggs was higher in the fresh egg zone,with percentages of 57.31%and 60.26%,respectively.However,in lateral or spaced arrangements,the proportion of parasitized eggs was higher in the old egg zone,at 48.21%and 48.36%,respectively.This study demonstrates that both the spatial distribution and arrangement of host eggs can influence the parasitism behavior of T.ostriniae to varying degrees.Optimal parasitism occurs when egg cards are placed top-down in the inoculation area,with the emergence point of the parasitoid positioned adjacent to the egg card.Lateral arrangement of fresh and old eggs can enhance the parasitism ratio of old eggs when mixed.
国家科技期刊平台
NSTL
万方数据
