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中美专家合作在美国犹他州对小麦矮化腥黑穗病菌的侵染能力进行了研究。试验采用不含抗病基因的小麦品种Cheyanne,播种前用溴甲烷对试验小区进行了熏蒸。接种物为含有多种致病型的冬孢子悬浮液,采用土壤表面喷洒冬孢子悬浮液的方法进行接种,接种密度为每cm20、0.88、8.84、88.45、884.49、8844.89、88449个孢子。结果表明,接种密度为每cm20.88个孢子时即可产生0.21％的穗发病率。对试验数据进行分析后表明,小麦矮化腥黑穗病菌的侵染规律符合侵染概率理论,在本试验条件下,单个孢子的侵染概率为0.0002。
The cooperation between Chinese and American experts in the Utah state of the United States of wheat dwarf typhus Toxicity were studied. Cheyanne, a wheat cultivar without disease-resistance gene, was used to fumigate the experimental plot with methyl bromide before sowing. The inoculum is a teliospore suspension containing various pathogenic types. The inoculation density is 20.88, 8.84, 88.45, 884.49, 8844.89 and 88449 spores per cm 2 by spraying the surface of the soil with a suspension of teliospores. The results showed that the inoculation density produced 0.21% spike incidence per 20.88 spores per cm. The analysis of the experimental data showed that the infection rule of T. dwarfingi was consistent with the infection probability theory. Under this experimental condition, the infection probability of single spore was 0.0002.