环氧乙烷熏蒸玉米枯萎病菌应用技术的研究

 环氧乙烷熏蒸带有植物检疫病原的进口玉米,已获得满意的杀菌效果。熏蒸期间粮温在15-25℃,密闭熏蒸3-5天,熏蒸玉米枯萎病细菌的有效杀菌剂量为50-75g/m³。同时还表明对该菌有一定的持续杀菌效应。
环氧乙烷熏蒸,玉米仓内气体分布情况测定明确了仓内气体浓度的持续时间和投药部位的选择。一般熏蒸以3-5天为宜;在投药点的选择上要考虑贮粮温度的高低。
用50-75g/m³的剂量熏蒸玉米,对种子的发芽有影响,与对照比较,降低发芽率4.5-79%,因此只能作口非种植玉米的处理,而不宜用以熏蒸作种的引种繁殖材料。

FUMIGATION EFFECT OF ETHYLENE OXIDE TO THE STEWART'S BACTERIAL WILT FOR TREATING IMPORTED GRAINS

Based on the results of a four-year laboratory and granary study, it was shown that ethylene oxide is very effective against Stewart's bacteria wilt of corn.The effectiveness and mode of action of this fungicide was diseased.
The results indicated that a 72-hour fimigation at a dose of 50-75g/m³ and a temperature of 15-25℃ was sufficient to destroy this bacterial disease.A lo-wer dose of 50g/m³ was less effective.
Study also showed that fumigation also produced residual effects on the elimination of the Stewart's bacterial wilt.Besides ethylene oxide was also effective in controlling mould and stored-grain pests, Thus the present treatment was proved to be an appropriate protective method for stored grains.
In analysis of the gas in the granary, it was shown that the result was influenced by the persistence of the concentrations gas, and the selected location for gas release.The fumigation time is to be last for 3-5 days.The location of gas release should be selected on the basis of the current temperature of the bulk grain.
However, at dose of 50-75g/m³ ethylene oxide resulted in some detrimental effect on the germination vigor of corn.So, it was not recommended for treating imported materials for propagation.