Fumigation Activities of 14 Kinds of Essential Oils and 1,8-Cineole Against the Larvae of Plodia Interpunctella(Hübner)
In order to screen environmentally friendly and safe plant-derived insecticides,the fumigation effects of 14 kinds of essential oils against the larvae of Plodia interpunctella(Hübner)were studied.The results in-dicated that the effect of Eucalyptus globules oil was better than that of the other essential oils.The corrected mortality rate reached 84.45％,89.54％,96.15％under the 24,48,72 h exposure.The results of fumigation toxicity of Eu-calyptus globules oil against larvae revealed as follows:with the extension of exposure time,the fumigation effect en-hanced significantly.When fumigation time increased from 12 h to 72 h,the LC50 decreased from 55.16 μL/L to 38.20 μL/L.Then 13 kinds of ingredients from Eucalyptus globules oil were found by GC-MS,the main component was 1,8-Cineole,and the relative content was 52.61％.The fumigation toxicity of 1,8-Cineole against larvae was studied.After 12,24,36,48,60,72 h fumigation treatment,the LC50 were 37.95,34.55,30.73,28.15,25.31,21.82 μL/L.The LC50 of 1,8-Cineole was lower than that of Eucalyptus globules oil.The fumigation effects of 1,8-Cineole against Plodia interpunctella larvae was stronger than that of Eucalyptus globules oil.The results of this study indicated that Eucalyptus globules oil and 1,8-Cineole have good fumigation activity against Plodia inter-punctella larvae.
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