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棉铃疫病是我国棉花烂铃的主要病害。几年来,我们对疫病的生态条件和防治措施作了较系统的研究。本试验对病菌在土壤中的存活形态、生存条件进行系统镜检和不同处理取样观察,明确了土壤中病铃壳上的厚垣孢子是疫病的主要存活形态,也是来年疫病的初侵染源。一、棉田残留病铃壳系统镜检从1977年开始,对当年发生的疫病棉铃壳采取三种方法镜检。 1.1977年8月中、下旬疫病盛发,于南汇县农科所试验棉田采集典型的疫病棉铃壳,阴干磨粉,保存室内定期镜检。 2.1978年2月初,将上述病铃壳埋于我院从未种过棉花的梨园表土下,定期取样镜
Cotton boll blight is the main disease of cotton boll in our country. Over the past few years, we made a more systematic study of the ecological conditions and prevention and treatment measures. In this experiment, the survival of bacteria in the soil morphology and living conditions of the system microscopy and different treatment sampling observation, clear disease Cyperus rotana in the soil is the main form of disease survivors, but also the initial source of infection in the coming year . First, cotton residual disease bell shell system Microscopy from 1977 on the occurrence of the disease cotton boll shell taken three kinds of microscopic examination. 1. In mid-to-late 1977, the epidemic occurred in mid-to-late period, and the cotton boll shell of the typical disease was collected from cotton fields tested by Nanhui County Agricultural Science Institute. In early February 1978, the above diseased shells were buried in the courtyard of pear orchards that had never been planted with cotton in our hospital. Periodic sampling mirrors