异色瓢虫十九斑变型对豆黄蓟马成虫的捕食功能反应

Predatory function responses of 19-spot Harmonia axyridis adult to Thrips nigropilosus

异色瓢虫十九斑变型是长春地区大豆田中重要的捕食性天敌昆虫之一,为明确这种天敌昆虫对豆黄蓟马成虫的控制作用,在实验室条件下测定了其捕食作用以及密度和种内干扰对其捕食能力的影响。结果表明:异色瓢虫十九斑变型成虫对豆黄蓟马成虫的捕食功能反应符合HollingⅡ方程,回归模型为Na=0.934 6N/(1+0.0339N);异色瓢虫捕食作用受自身密度制约,平均捕食量随自身密度增大而减少,回归模型为A=13.534P^(-0.702 9);异色瓢虫成虫间存在种内干扰,干扰反应回归模型为E=57.218P^(-1.246)。异色瓢虫十九斑变型对豆黄蓟马成虫有较好的捕食作用和控制潜能。

19- spot ladybug,Harmonia axyridis ab. Ovemdecimpunctata（Coleoptera： Coccinellidae）,is an important predatory natural enemy in soybean field in Changchun area. The predation responses of 19- spot ladybug to thrips Thrips nigropilosus（Thysanoptera： Thripidae） was investigated under laboratory condition. The results showed that the function responses of 19- spot ladybug to T. nigropilosus accorded with Holling Ⅱ disk equation of which the regression equation was Na=0. 934 6N/（1 ＋ 0.033 9N）. The predatory function of 19-spot ladybug on T. nigropilosus was restricted by the density of their population. The average consumption of the thrips decreased with the increase of density of 19-spot ladybug with the regression equation of A=13. 534P-0.702 9. Furthermore,there was intraspecies interference among 19-spot ladybug and the interference regression equation was E=57. 218P-1.24 6. The 19-spot ladybug showed a preferable predatory potential on controlling T. nigropilosus. These results could provide a guideline for field releasing of 19-spot ladybug.