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1990年我县马铃薯晚疫病大流行,发生面积14.5万亩,其中发病程度达四级的8.1万亩,占总发生面积的55.9%,发病程度2～3级的6.4万亩,占总发生面积的44.1%,总平均减产损失15%,总计损失马铃薯3.3万吨(烂薯),折经济损失456.8万元。其大流行的原因:一、气象条件适宜,有利发病1990年6月下旬至7月底40天总降雨量289.8毫米,比近20年(1970～1989年)平均值多140.6毫米;雨日24天,比20年平均多4.5天;空气相对湿度76.2%,偏高平均值
1990 potato pandemic pandemic in our county, the occurrence of an area of 145000 mu, of which 81000 mu of disease level of four, accounting for 55.9% of the total area, the incidence of 2 to 3 of 6.4 mu, accounting for the total area Of the total loss of 44.1%, the average loss of 15% of the total loss, a total loss of 33,000 tons of potatoes (rotten potato), economic losses of 4.568 million yuan. The reasons for its pandemic: First, meteorological conditions are favorable and conducive to disease The total rainfall of 289.8 millimeters from the late June to the end of July 1990 was 140.6 millimeters more than the average of the past 20 years (1970 to 1989) , 4.5 days more than in 20 years on average; air relative humidity 76.2%, high average