武夷科学

三线茶蚕蛾(Andraca bipunctata)是油茶的主要食叶害虫之一，在福建省广泛分布。本研究在上杭县油茶林开展了利用球孢白僵菌(Beauveria bassiana)孢子悬浮液及粉剂防治三线茶蚕蛾幼虫试验。结果表明，用浓度为1.0×10⁵、1.0×10⁶、1.0×10⁷、1.0×10⁸、1.0×10⁹孢子·mL^-1的悬浮液喷雾防治，幼虫死亡率随时间延长而增高；喷菌液9 d后，1.0×10⁷、1.0×10⁸、1.0×10⁹孢子·mL^-1浓度处理的幼虫死亡率分别为81.6%、84.6%和85.9%,校正死亡率分别为79.9%、83.1%和84.5%。用粉剂7.5 kg·hm^-2进行防治，施菌9 d后，幼虫平均死亡率为73.7%。研究结果可为球孢白僵菌防治三线茶蚕蛾幼虫提供参考。

Andraca bipunctata is one of the main leaf-eating pests of Camellia oleifera, and it is widely distributed in Fujian Province, China. In this study, biocontrol experiments were conducted against A. bipunctata larvae using a spore suspension and powder of Beauveria bassiana in a C. oleifera forest of Shanghang County. The results showed that the mortality rate of the larvae increased over time when the pests were treated with a concentration series of 1.0×10⁵, 1.0×10⁶, 1.0×10⁷, 1.0×10⁸, and 1.0×10⁹ fungal conidia·mL^-1. After 9 days of spraying the spore suspension, mortality rates of the larvae at concentrations of 1.0×10⁷, 1.0×10⁸, and 1.0×10⁹ conidia·mL^-1 were 81.6%, 84.6%, and 85.9%, respectively; the corrected mortality rates were 79.9%, 83.1%, and 84.5%, respectively. The average mortality rate of the larvae was 73.7% after 9 days of treatment with the powder of B. bassiana conidia at 7.5 kg·hm^-2. These findings provide a scientific reference for the control of A. bipunctata larvae by B. bassiana.