Based on the disease situation of agricultural region in eastern Qinghai in 1999 - 2007, the relationships between annual rainfall change and wheat-rapeseed diseases were studied. The results indicated that the relationship between wheat disease incidence and the annual rainfall satisfied the equation y=-0. 015 194x+6. 538 82, with r=0. 350, while the relationship between rapeseed disease incidence and the annual rainfall satisfied the equation y = 0. 002 020a:-0. 569 56, with r=0. 784. Therefore, there were low or moderate positive correlations between the annual rainfall and wheat or rapeseed diseases, the more the annual rainfall, the more serious the diseases of wheat and rapeseed.%基于1999-2007年青海东部农业区病害发生情况,分析年降雨量的变化与小麦、油菜病害发生的相关性.结果显示,随年降雨量的不同,小麦和油菜病害的发生率也有差别.小麦病害发生率与年降雨量间的相关系数为0.350,满足方程y=-0.015194x+6.53882;油菜病害发生率与年降雨量间的相关系数为0.784,满足方程y=0.002020x-0.56956.表明小麦、油菜病害发生与年降雨量之间分别存在低度和中度正相关关系,即年降雨量越多,小麦病害和油菜病害发生越严重.
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