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首页> 外文期刊>Journal of Economic Entomology >Effect of temperature and humidity on insecticidal effect of SilicoSec against Ephestia kuehniella (Lepidoptera : Pyralidae) larvae
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Effect of temperature and humidity on insecticidal effect of SilicoSec against Ephestia kuehniella (Lepidoptera : Pyralidae) larvae

机译：温度和湿度对SilicoSec杀灭Kuehniella鳞翅目幼虫的杀虫效果的影响

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摘要

Laboratory experiments were carried out to assess the insecticidal effect of the diatomaceous earth formulation SilicoSec against larvae of Ephestia kuehniella Zeller (Lepidoptera: Pyralidae), in stored wheat (Triticum durum Desf.). Larvae were exposed to wheat treated with SilicoSec at 400 and 800 ppm and held at 20, 25, and 30 degrees C and 55 and 75% RH. Larval mortality was assessed after 24 h, 48 h, 7 d, and 14 d of exposure in the treated wheat. At both dose rates, mortality increased with temperature, but this increase varied with the exposure interval. At short (<= 48-h) exposures, larval mortality was significantly higher at 30 degrees C than at the other two temperatures. In contrast, no significant differences were noted between 20 and 25 degrees C. At longer exposures (>= 7 d), the increase of temperature increased mortality at 800 ppm, but no significant differences were noted between 25 and 30 degrees C at 400 ppm. Furthermore, significant differences in larval mortality were noted between the two humidity levels, but only at exposures :7 d. After 14 h of exposure, at both dose rates examined, the increase of temperature significantly decreased mortality. The results of the current study indicate that E. kuehniella is susceptible to SilicoSec, but temperature and relative humidity should be taken into consideration.
机译：进行了实验室实验，以评估硅藻土配方SilicoSec对储藏小麦（Triticum durum Desf。）中的埃克氏菌幼虫（Ephhestia kuehniella Zeller（鳞翅目：Pyralidae）的幼虫）的杀虫效果。将幼虫暴露于在400和800 ppm的SilicoSec处理下并保持在20、25和30摄氏度，55和75％RH的小麦下。在处理过的小麦中分别暴露24h，48h，7d和14d后评估其幼虫死亡率。在两种剂量率下，死亡率均随温度升高而增加，但这种升高随暴露间隔而变化。在短时间（<= 48小时）暴露下，在30摄氏度时的幼虫死亡率显着高于其他两个温度。相反，在20到25摄氏度之间没有发现显着差异。在更长的暴露时间（> = 7 d）下，温度的升高在800 ppm时增加了死亡率，但是在25到30摄氏度之间在400 ppm时没有发现显着差异。 。此外，两个湿度水平之间的幼虫死亡率有显着差异，但仅在暴露时间：7 d时。暴露14小时后，在两种剂量率下，温度升高均显着降低了死亡率。目前的研究结果表明，库氏大肠杆菌对SilicoSec敏感，但应考虑温度和相对湿度。

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