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首页> 外文期刊>Turkish Journal of Agriculture & Forestry >Toxicity of native Bacillus thuringiensis isolates on the larval stages of pine processionary moth Thaumetopoea wilkinsoni at different temperatures
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Toxicity of native Bacillus thuringiensis isolates on the larval stages of pine processionary moth Thaumetopoea wilkinsoni at different temperatures

机译：苏云金芽孢杆菌天然分离物在不同温度下对松树蛾蛾幼虫幼虫期的毒性

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摘要

Pine processionary moth, Thaumetopoea wilkinsoni Tarns, is an important defoliating lepidopteran pest of pine trees. The aim of this study was to determine the required spore-crystal concentration of local Bacillus thuringiensis (Bt) isolates, optimalambient temperature, and larval stage to control this troublesome forest pest. The susceptibility of T. wilkinsoni larvae decreased with older stage and lower temperatures. The optimum temperature was found to be 15 °C or higher for the control of early larval stages. At the highest spore-crystal concentration (500 ug g_1), the most effective isolate (SY49.1) caused 83% mortality for the second-stage larvae at 5 °C. However, an approximately 4-fold decrease in mortalities was observed in late-stage larvae for all isolates examined at this temperature. Nevertheless, other Bt isolates, excluding SY27.3, caused nearly complete mortality at 25 °C for early-stage larvae. Considering the distribution of seasonal temperature, Bt products should be appliedat the highest ambient temperature to earlier stages for efficient control. We propose that local Bt isolates SY27.1, SY49.1, and SY62.1 could be used to develop environmentally safe bioinsecticides to control this important pest species. These resultsindicate that larval stage and environmental temperature should be taken into consideration for efficient control of T. wilkinsoni using the spore-crystal mixture of Bacillus thuringiensis isolates.
机译：松树蛾（Thaumetopoea wilkinsoni Tarns）是一种重要的落叶松树鳞翅目害虫。这项研究的目的是确定当地苏云金芽孢杆菌（Bt）分离株所需的孢子晶体浓度，最佳环境温度和幼虫期，以控制这种麻烦的森林害虫。 T. wilkinsoni幼虫的敏感性随着年龄的增长和温度的降低而降低。发现控制幼虫早期的最佳温度为15°C或更高。在最高的孢子晶体浓度（500 ug g_1）下，最有效的分离株（SY49.1）在5°C下引起第二阶段幼虫的死亡率为83％。但是，在此温度下检查的所有分离株的后期幼虫的死亡率均降低了约4倍。然而，除SY27.3外，其他Bt分离株在25°C时可导致早期幼虫几乎完全死亡。考虑到季节性温度的分布，Bt产品应在最高环境温度下应用于较早的阶段以进行有效控制。我们建议，可以将当地的Bt分离株SY27.1，SY49.1和SY62.1用于开发对环境安全的生物杀虫剂，以控制这一重要害虫物种。这些结果表明使用苏云金芽孢杆菌分离物的孢子-晶体混合物有效地控制野生金枪鱼应考虑幼虫的阶段和环境温度。

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