中文摘要：

为探究斑痣悬茧蜂在野外的寄主搜寻行为,首先利用飞行磨测定了最大理论飞行能力,然后在大豆田进行了两次放蜂试验,通过回收或采集斜纹夜蛾寄主幼虫统计寄生情况,分析了寄生蜂的有效搜寻及其影响因素。飞行磨吊飞测定结果表明,个体起飞次数为14.48次±0.82次,总飞行距离1283.00 m±45.60 m,总飞行时间2374.79 s±89.91 s,平均飞行速度0.54 m·s^-1±0.004 m·s^-1,最长的单次飞行时间475.21 s±76.97 s。田间放蜂试验结果表明,在风速≤4.2 m·s^-1的大豆田中,方位对寄生率没有显著影响;但寄生率随时间延长和离放蜂点的距离增加而显著降低。放蜂的次日寄生蜂可扩散到36 m处。最后,对斑痣悬茧蜂野外搜寻行为特征进行了讨论。

英文摘要：

To gain insight into the foraging behavior of Meteorus pulchricornis in field,the potential flight capability of M.pulchricornis was measured on a flight mill,and two field releases were conducted in soybean field to measure the parasitism as affected by the release direction,time,and distance through the recapture and collection of Spodoptera litura larva hosts.The flight mill test showed that the number of taking-off was 14.48±0.82,total flight distance was 1283.00 m±45.60 m,overall flight duration was 2374.79 s±89.91 s,flight velocity was 0.54 m·s^-1±0.004 m·s^-1,and the longest single flight duration was 475.21 s±76.97 s.Field release trial indicated that release direction did not affect the parasitism significantly at the wind speed ≤4.2 m·s^-1,but the parasitism varied significantly with release time and distance.The parasitism decreased with the increase of the time elapsed and the distance away from the release point.The parasitoid could disperse 36 meters away in one day.Based on these results,the characteristics of the foraging behavior of M.pulchricornis in field were discussed.