玉米螟赤眼蜂是一种优良的卵寄生性天敌，寄主卵的分布方式会影响赤眼蜂的寄生偏好。为了明确寄主卵不同空间格局及排列方式对赤眼蜂寄生偏好的影响，分别模拟了米蛾卵在顶、侧、底分布以及新旧米蛾卵以镶嵌或间隔排列时玉米螟赤眼蜂对其的寄生情况。结果发现，玉米螟赤眼蜂在搜索寄主过程中会优先选择临近位置的卵粒开始寄生，且当出蜂位置和寄主卵位置同时位于接种区顶部或底部时，该区域卵的寄生率相对较高，为49.42%、68.58%；新旧卵镶嵌排列时，新卵区的寄生卵分布比例相对更高，分别为57.31%、60.26%，但左右排列和间隔排列时，旧卵区的寄生卵分布比例相对较高，分别为48.21%、48.36%。寄主卵的空间分布和排列方式均能不同程度影响玉米螟赤眼蜂的寄生行为，因此，接蜂时宜将卵卡放置在接种区顶端向下，接蜂位置临近卵卡位置最佳；将新、旧卵以左右排列时，可提高旧卵在混用时的寄生比例。

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.

Q968.1；S476

山西省科技重大专项计划“揭榜挂帅”项目(202101140601026-6-2)。