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1982年4～7月,我们对陕西、河南、甘肃、四川等省的18个县(市)的泡桐丛枝病发生情况与环境因子关系进行了调查,并对调查的土壤资料,用通径分析的方法进行了研究。结果发现土壤中磷、钾含量之比值(P/K)与泡桐丛枝病感病指数成负相关。即磷含量愈高,发病愈轻,含量愈低,发病愈重,钾的影响与此相反。这就为泡桐丛枝病的防治提供了新的途径。1965年以来,陕西省的渭南、蒲城等县,先后从河南引种了大量的兰考桐,使泡桐在陕西有了很大发展。随着泡桐的发展,丛枝病(MLO)也日益严重,给生产带来了很大威胁。目前,对泡桐丛枝病国内外都在研究,但对该病发病规律还不够了解。有的资料记载与土壤有关,但关系的焦点却不清楚。有
From April to July 1982, we investigated the relationship between the occurrence of Paulownia witches’ broom disease and environmental factors in 18 counties in Shaanxi, Henan, Gansu and Sichuan provinces, The method of analysis was studied. The results showed that the ratio of P and K in soils was negatively correlated with the susceptibility index of Paulownia witches’ broom disease. Namely, the higher the phosphorus content, the lesser the incidence, the lower the content, the heavier the incidence and the opposite is the effect of potassium. This provides a new way for the prevention and treatment of Paulownia witches broom disease. Since 1965, Weinan, Pucheng and other counties in Shaanxi Province have successively introduced a large number of blue-kohlrabi from Henan, so that Paulownia has made great progress in Shaanxi. With the development of paulownia, the growing of bush disease (MLO) is also a serious threat to the production. At present, the Paulownia witches broom disease both at home and abroad are studying, but the incidence of the disease is not enough understanding. Some information on the soil and related, but the focus of the relationship is not clear. Have