Fumigant activity of several kinds of plant essential oils against Cryptolestes pusillus Schnherr

The fumigant toxicity of the essential oils of Citrus tangerina,C. limon,C. hongheensis,Litsea cubeba,Mentha spicata,Pinus tabulaeformis, Cinnamoum camphora, Melaleuca alternifolia and Eucalyptus globules on adults of maize weevil, Cryptolestes pusillus Schnherr was investigated at the dosage of 40L/L and under the exposure time of 12, 24, 36, 48 hours and 60 hours, respectively. The results proved that the fumigation efficacy of the essential oils of C. tangerina, M. alternifolia, C. limon, M. spicata and P. tabulaeformis are better than that of the other four essential oils. The essential oils of E. globules had the strongest fumigation toxicity to maize weevil. The LC_(50) of the flat grain beetle fumigated by the essential oils of E. globules under the exposure time of 12, 24, 36, 48 hours and 60 hours was 15.29,6.44,6.55,3.32, 1.29L/L, respectively. The LT_(50) of the beetle exposed at the concentration of 4, 8, 12L/L was 45.4827.2817.64h, respectively.