中文摘要：

为评价灰毛豆叶、树皮和种子精油对谷蠹的毒杀活性,分别测定了它们对谷蠹的驱避活性、触杀活性、熏蒸活性及种群抑制作用。结果表明,处理48 h后,3种精油对谷蠹成虫的驱避率达到最大值,分别是82.3%、90.7%和94.3%;3种精油都对谷蠹5日龄若虫具有触杀活性,其LD50值分别为每虫25.0、27.9和27.8 mg;在用量为20.0 mg/L时,3种精油对谷蠹成虫都具有熏蒸活性,熏蒸48 h后成虫的死亡率为56.2%~57.4%,3种精油的熏蒸活性无显著性差异;当100 g稻谷中拌有200 mg精油时,3种精油对当代种群的抑制率分别为45.5%、53.6%和76.8%,对子代种群的抑制率分别为43.8%、68.7%和75.1%,其中种子精油的抑制活性最高,且显著高于树皮及叶片精油的活性。

英文摘要：

In order to assess insecticidal activities of the essential oils from Tephrosia purpurea leaves,T.purpurea barks and T.purpurea seeds against Rhizopertha dominica,the repellent,contact,fumigant and population inhibition toxicity of the three kinds of essential oils to R.dominica were determined respectively.The results showed： 1） Repellent rate reached to the maximum value with the corresponding repellency percentage of 82.3%,90.7% and 94.3% after 48 h treatment;2） All the three kinds of essential oils had exhibited contact toxicity against the 5-day old nymph of R.dominica after 24 h treatment,with the value of LD50 being 25.0,27.9 and 27.8 mg/insect respectively;3） Fumigant activity to the adult was examined after 48 hours＇ exposure to each of the three kinds of essential oils at the concentration of 10.0 g/m3;Their mortality ranged from 56.2% to 57.4%,and there was no significant difference among the mortality to the three kinds of essential oils;4） At the dosage of 200 mg essential oils per 100 g paddy;the current population inhibition rate of the three kinds of essential oils against R.dominica population was 45.5%,53.6% and 76.8%;F1 progeny population inhibition rate was 43.8%,68.7% and 75.1%,and essential oils from the seeds exhibited more noted population inhibition activity than that of the other two kinds of essential oils.