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对带菌土壤、病残体进行传病试验 ,研究了人工接种条件下种子带菌条件及带菌种子传病情况 ,结果表明 ,带菌土壤和病残体无论是在当年还是越冬后都可有效地传播大豆疫霉根腐病 ,是大豆疫霉根腐病的主要初侵染源和传播途径。人工接种可以导致大豆种子带菌 ,但只有在病菌直接接触到豆荚才有这种结果。幼荚期接种豆荚可以使荚内的豆粒严重发病 ,豆粒被一层菌丝包裹 ,这些豆粒虽然本身不能萌发 ,但能作为接种体导致邻近的健康植株发病。作者通过大量的播种试验 ,到目前为止还末能证实来自自然发病田的种子常规越冬后能够传病 ,相关工作正在进行中。
Carrying on the disease test on the contaminated soils and the diseased bodies, the conditions of inoculation of the seeds under the artificial inoculation and the transmission of the contaminated seeds were studied. The results showed that the contaminated soils and the diseased soils could effectively propagate the soybean both in the current year and the winter Phytophthora root rot, is the main source of infection and transmission of soybean Phytophthora root rot. Artificial inoculation can lead to soybean seed carryover, but this is the result only if the pathogen is in direct contact with the pod. Inoculation of pods in young pods can cause severe incidence of legumes in the pods. The legumes are surrounded by a layer of mycelium. Although these beans can not germinate by themselves, they can act as inoculants and lead to the pathogenesis of neighboring healthy plants. The author through a large number of sowing trials, so far it has not been able to confirm that the seed from the natural field of disease can be transmitted after the winter, the related work is underway.