Wang Zi-Qi, Zhou Xiao-Gui, Xiao Qiang, Tang Pu, Chen Xue-Xin
Institute of Insect Sciences, College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China.
Zhejiang Provincial Key Laboratory of Biology of Crop Pathogens and Insects, Zhejiang University, Hangzhou 310058, China.
Insects. 2022 Oct 16;13(10):937. doi: 10.3390/insects13100937.
The tea grey geometrid has long been a significant insect pest of tea plants in China. Two parasitoids, and (Hymenoptera: Braconidae: Microgastrinae), are the most important parasitoids in the larval stage of . Yet, the potential of these two parasitoids for controlling the tea grey geometrid is not known. Here, we studied the parasitism performance of these two parasitoid species on different host densities under different temperatures as well as the interference effect of parasitoid density. The results showed that both parasitoid species, and , exhibited a Type II functional response towards the tea grey geometrid at four tested temperatures. With increasing the density of larvae, the number of parasitized larvae increased until a maximum was reached. The highest number of hosts parasitized by or reached 14.5 or 14.75 hosts d at 22 °C, respectively. The estimated values of instantaneous searching efficiency (a) and handling time (h) for or were 1.420 or 3.621 and 0.04 or 0.053 at 22 °C, respectively. performed better than under higher temperatures. The parasitism rate by a single female parasitoid decreased with increasing parasitoid density at different temperatures, resulting in a reduction of searching efficiency. The findings of this study showed that could be a better effective biocontrol agent than against the tea grey geometrid.
茶尺蠖长期以来一直是中国茶树的重要害虫。两种寄生蜂，[寄生蜂1名称]和[寄生蜂2名称]（膜翅目：茧蜂科：小腹茧蜂亚科），是茶尺蠖幼虫阶段最重要的寄生蜂。然而，这两种寄生蜂控制茶尺蠖的潜力尚不清楚。在此，我们研究了这两种寄生蜂在不同温度下对不同寄主密度的寄生性能以及寄生蜂密度的干扰效应。结果表明，在四个测试温度下，两种寄生蜂对茶尺蠖均表现出II型功能反应。随着茶尺蠖幼虫密度的增加，被寄生幼虫的数量增加，直至达到最大值。在22℃时，[寄生蜂1名称]或[寄生蜂2名称]寄生的寄主最高数量分别达到14.5或14.75头/天。在22℃时，[寄生蜂1名称]或[寄生蜂]的瞬时搜索效率（a）和处理时间（h）的估计值分别为1.420或3.621以及0.04或0.053。在较高温度下，[寄生蜂1名称]比[寄生蜂2名称]表现更好。在不同温度下，单个雌蜂的寄生率随寄生蜂密度的增加而降低，导致搜索效率下降。本研究结果表明，在防治茶尺蠖方面，[寄生蜂1名称]可能比[寄生蜂2名称]是更有效的生物防治剂。
