4种单体化合物对甜菜夜蛾嗅觉行为的影响

利用Y型嗅觉仪测定方法,研究了己酸、壬酸、己醇和壬醛4种单体化合物对甜菜夜蛾嗅觉行为的影响,并对4种化合物的有效剂量进行了筛选。结果表明,4种供试化合物均对甜菜夜蛾雌虫表现出明显的驱避作用。己酸的驱避活性剂量范围为稀释200～1 200倍,壬酸的有效剂量范围为稀释10～1 000倍,己醇在稀释300倍和500倍时表现出显著的驱避活性,而壬醛在稀释800～1 200倍时对甜菜夜蛾雌虫有显著的驱避作用。己酸、壬酸、己醇和壬醛驱避效果最佳的稀释倍数分别为1 000倍、500倍(和800倍)、500倍、1 000倍,驱避率依次为96%、82%、76%、82%。因此,这4种对甜菜夜蛾具有明显抑制作用的单体化合物在甜菜夜蛾的防治方面有潜在的应用前景。

Olfactory Responses of Beet Armyworm to Four Mono-chemicals

In this study,the olfactory responses of beet armyworm(Spodoptera exigua) females to four volatiles(hexanoic acid,nonanoic acid,hexanol and nonaldehyde) were determined using Y type olfactometer,and the optimal concentrations of four mono-chemicals were screened.The results showed that all of the four compounds detrimentally affected the olfactory behavior and had significantly repellent effects on the females.Hexanoic acid,nonanoic acid,hexanol and nonaldehyde displayed obvious repellent effects on S.exigua at a concentration of 200-1 200 fold dilution,10-1 000 fold dilution,300-500 fold dilution and 800-1 200 fold dilution,respectively.They showed the strongest repellent effects on S.exigua,96%,82%,76% and 82%,respectively,when diluted by 1 000 times,500 and 800 times,500 times,and 1 000 times.Therefore,the four mono-chemicals have potential applications in control of S.exigua.