Influence of Applied Dose and Exposure Time on Mortality of Peach Fruit Moth Eggs in Short Time Methyl Bromide Fumigation

摘要

The laboratory scale test was conducted with different combinations of dose and exposure time in the same CT product to examine influence of applied dose and exposure time on mortality of the pest in short time methyl bromide fumigation. The peach fruit moth (Carposina sasakii) eggs on the filter paper were fumigated at 38 g/m~3 for 1 hr, 19 g/rn~3 for 2 hrs, 12.7 g/m~3 for 3 hrs, 6.3 g/m~3 for 6 hrs and 3.8 g/m~3 for 10 hrs at 15°C, respectively. Ratios of residual gas were 96-101% and CT Productswere 36.4-38.4 mg centre dot h/l. The mortality data showed that higher mortality was obtained from fumigation of longer exposure time, and that influence of exposure time on the mortality was larger than that of applied dose in the same CT product. Theresult of the test indicates that even if regulated CT product was satisfied on the way of fumigation, the fumigation has to be continued till the end of regulated fumigation time.