Research Centre, Agriculture and Agri-Food Canada, Lethbridge, AB, Canada T1J 4B1.
J Econ Entomol. 2012 Apr;105(2):732-7. doi: 10.1603/ec11359.
We examined the effects of temperature on mortality of larval stable fly [Stomoxys calcitrans (L.)] caused by Bacillus thuringiensis tolworthi 4L3, B. t. darmastedensis 4M1, B. t. thompsoni 401, B. t. thuringiensis HD2, and B. t. kurstaki HD945. At moderate doses, mortality caused by all isolates ranged from 87 to 99% at 15 degrees C and declined to 29-63% as temperature increased to 30 degrees C. A similar pattern was seen when a higher dose was used, except that the reduction in mortality at warmer temperatures was not as great as was seen with the moderate doses. Insecticidal activity of each isolate against first-instar larvae was reduced by only 5-15% after 5 d in the medium. Mortality of second- and third-instar larvae ranged from 2 to 21%, suggesting the isolates were less effective against larger larvae.
我们研究了温度对苏云金芽胞杆菌tolworthi 4L3、B. t. darmastedensis 4M1、B. t. thompsoni 401、B. t. thuringiensis HD2 和 B. t. kurstaki HD945 导致的幼虫厩螫蝇（Stomoxys calcitrans (L.)）死亡率的影响。在中等剂量下，所有分离株在 15°C 时引起的死亡率从 87%到 99%不等，当温度升高到 30°C 时，死亡率下降到 29-63%。当使用更高的剂量时，出现了类似的模式，只是在较高温度下死亡率的降低不如中等剂量时那么大。在培养基中放置 5 天后，每个分离株对初孵幼虫的杀虫活性仅降低了 5-15%。第二龄和第三龄幼虫的死亡率从 2%到 21%不等，表明这些分离株对较大的幼虫效果较差。
