Fumigant Activity of Essential Oil from Armoracia　rusticana ( L. ) against Plodia interpunctella ( Lepidoptera: Pyralidae)

摘要

The fumigant toxicity of essential oil from Horseradish plant,Armorncia rusticana (L.)was assessed against the Indian meal moth,Plodia interpunctella (Hübner). Eggs, larvae, pupae and adults were exposed to different concentrations of 0,2,4,8,16 and 32μL/L of essential oil. A. rusticana oil was found to significantly affect the egg hatch rate, pupal survival, larval and adult mortality of P. Interpunctella. Results showed that the LC50 value for larvae was 15.53g/m3, as well as 5.54g,/m3 for adults. Fumigation activity of the A. rusticarta oil appeared to be dose dependent. An increase in treatment concentration led to reduced hatch rate in eggs, and an increase in mortalities of both larvae and adults. Although there was significant difference in survival between the pupae that received plant oil fumigation and those in control treatments, but it appears that pupal eclosion was generally high across treatments,since a high percentage (69%) of pupae eclosed as compared to 90% eclosion observed in the control. These results indicate that it may be possible to achieve toxicity levels similar to those of standard chemical fumigants through the applications essential oils from A. rusticana.