Fumigant activity of plant essential oils and components from horseradish (Armoracia rusticana),anise (Pimpinella anisum)and garlic (AIlium sativum)oils against Lycoriella ingenua (Diptera:Sciaridae)

摘要

Plant essential oils from 40 plant species were tested for their insecticidal activities against larvae of Lycoriella ingenue (Dufour)using a fumigation bioassay.Good insecticidal activity against larvae of L.ingenua was achieved with essential oils of Chenopodium ambrosioides L.,Eucalyptus globulus Labill,Eucalyptus smithii RT Baker,horseradish,anise and garlic at 10 and 5 mu LL~(-1)air.Horseradish,anise and garlic oils showed the most potent insecticidal activities among the plant essential oils.At 1.25 mu LL~(-1),horseradish,anise and garlic oils caused 100,93.3 and 13.3% mortality,but at 0.625 mu LL~(-1)air this decreased to 3.3,0 and 0% respectively.Analysis by gas chromatography-mass spectrometry led to the identification of one major compound from horseradish,and three each from anise and garlic oils.These seven compounds and m-anisaldehyde and o-anisaldehyde,two positional isomers of p-anisaldehyde,were tested individually for their insecticidal activities against larvae of L.ingenua.Allyl isothiocyanate was the most toxic,followed by trans-anethole,diallyl disulfide and p-anisaldehyde with LC_(50)values of 0.15,0.20,0.87 and 1.47 mu LL~(-1)respectively.