植物精油对锈赤扁谷盗成虫熏蒸毒杀作用研究

Fumigant toxicity activity of essential oils against Cryptolestes ferrugineus (Stephens)

为明确适用于防治锈赤扁谷盗的植物精油种类及其用量,本试验采用拌粮密闭熏蒸法,比较23种植物精油对锈赤扁谷盗成虫熏蒸毒杀活性差异,从中筛选出作用效果较好的精油种类进行熏蒸毒力测定。通过二次筛选结果表明,大蒜与芥末精油对锈赤扁谷盗成虫具有明显的熏蒸毒杀作用。进一步的毒力测试结果表明,在24 h、48 h、72 h处理时间下,大蒜精油对锈赤扁谷盗成虫的LC_(50)值分别为0.7827、0.7222、0.6478μL/L,而芥末精油在相同处理时间条件下的LC_(50)值分别为2.7581、2.6117及2.4619μL/L,大蒜精油对锈赤扁谷盗具有更强的熏蒸毒杀活性。

The fumigant toxicity of 23 essential oils on adults of rusty grain beetle, Cryptolestes ferrugineus （ Stephens） was investigated with the method of mixing oils with diet. The results proved that the fumigant toxicity activity of the essential oils of A l l ium sa tivum and Brassica nig ra were better than that of the other 21 essential oils. The LC50 of rusty grain beetle fumigated by the essential oils of A . sativum under the exposure time of 24, 48 and 72 hours were 0. 7827, 0. 7222 and 0. 6478 jj, L/L, respectively. While the LC50 of B . n ig ra under the same exposure time were 2. 7581, 2. 6117 and 2.4619 jiiyL, respectively. The fumigant toxicity of A . sa tivum on adults of rusty grain beetle was stronger than that of B. nigra.