Abstract: Bioactivity of essential oils from Allium sativum L, Zingiber officinale Roscoe, Zanthoxylum bungeanum Maxim and Illicium verum Hook on Oryzaephilus surinamensis was tested in the laboratory by sensitive layer method with filter paper and fumigation method with wild-mouth bottle.The results showed that essential oils from 4 plants had a certain repellent activity and fumigant activity on adults of O.surinamensis. The average repellent rate was 70.71%,60.64%, 53.78% and 66.33%,respectively.The average corrected mortality was 60.47%,51.71%,47.01% and 56.28%,respectively.The difference between them reached significant level.The repellent activity on O.surinamensis was related positively with dosages and treatment time,it would reduce with the dropping of dosages and the extending of treatment time.But the interaction of dosages and treatment time did not affect the repellent activity,significantly.The fumigant activity was related positively with dosages,treatment time and their interaction,it would reduce with the dropping of dosages,but increase with the extending of treatment time.Further toxicity analysis showed that toxicity of essential oils from A.sativum was the strongest with LC₅₀ value of 6.01 μL/L after 12 h.The toxicity of essential oils from 4 plants increased significantly with the extending of time.This suggested that essential oils from 4 plants had a certain bioactivity on adults of O.surinamensis, and had the potential to be exploited as new nuisanceless pesticides.

Key words: essential oils, Oryzaephilus surinamensis, repellent activity;fumigant activity