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(1)同一年不同地区油菜病毒病发病轻重主要决定于秋季十字花科蔬菜面积的大小,二者成正相关关系。 (2)油菜病毒病在同一地区不同年度发病的轻重,则主要决定于先年九、十两月的降水量,雨量与病害成负相关关系。但降雨只是在毒源丰富的条件下起作用,毒源过少降雨的影响不大。 (3)早秋十字花科疏菜病毒病发病量与次年油菜角果期发病量成正相关。一、研究方法: 1、选本县秋季十字花科蔬菜面积多、中、少三个类型的村、组,统计耕地面积,秋季
(1) The incidence of rape virus disease in different regions of the same year was mainly determined by the size of the cruciferous vegetable area in autumn, and the two were positively related. (2) The incidence of rape virus disease in different years in the same area is mainly determined by the precipitation in September and December of the previous year. The rainfall and the disease have a negative correlation. However, rainfall only plays a role in the condition of rich source of poison and little effect of rainfall on rainfall. (3) Early autumn flowering cross-flowering cabbage virus disease incidence and the second year rape pod stage incidence is positively correlated. First, the research methods: 1, select the county cruciferous vegetables in the area more, less, less three types of villages, groups, statistical arable land, autumn