剑毛帕厉螨对韭蛆捕食功能反应的研究

Functional response of Stratiolaelaps scimitus to Bradysia odoriphaga

【目的】韭菜是广受人们喜爱的蔬菜,韭菜迟眼蕈蚊Bradysia odoriphaga Yang&Zhang是近年来危害韭菜的重要根部害虫,长期过量施用剧毒化学农药已严重影响了人们的健康和造成环境的污染,挖掘和筛选有效防控韭蛆的天敌迫在眉睫。剑毛帕厉螨Stratiolaelaps scimitus是一种与韭蛆栖境相同的捕食性天敌螨类。目前尚未有关于剑毛帕厉螨对韭蛆的捕食功能反应的研究。【方法】测定了剑毛帕厉螨对1龄韭蛆的捕食作用和种内干扰对其捕食能力的影响。【结果】该螨对1龄韭蛆的捕食功能反应符合HollingⅡ型;随着捕食螨密度的增加,该螨成虫间存在相互干扰作用;其搜寻效应随猎物密度的增加而下降,表明猎物对捕食作用的干扰较明显。【结论】剑毛帕厉螨是一种有效防治韭蛆的天敌,有较好的应用前景。

[Objectives] Leeks are a popular vegetable and Bradysia odoriphaga has recently become an important root pest of leek crops. Long-term excessive application of highly toxic chemical pesticides has seriously affected peoples＇ health and caused environmental pollution. Evaluating potential biological control agents for B. odoriphaga is therefore both timely and important. Stratiolaelaps Scimitus is a predator with the same habitat as B. odoriphaga. A predator＇s functional response is a key factor in the population dynamics of predation and predation systems. Although previous studies have shown that S. scimitus prefers feeding on larvae of B. odoriphaga, there is currently no published information on the predatory functional response of S. scimitus to B. odoriphaga. [Methods] The functional response of S. scimitus to B. odoriphaga was studied in a laboratory. [Results] The function responses of S. scimitus to B. odoriphaga approximated the Holling II equation. There was intraspecies interference among S. scimitus and its search efficiency decreased as prey density increased, which suggests that B. odoriphaga has an obvious interference effect on S. scimitus. [Conclusion] S. scimitus is a natural predator of B. odoriphaga that has potential as a biological control for this pest.