水稻是牡丹江市主要高产粮食作物之一,约占粮食作物总产的30%。历年来造成水稻单产不稳的一个重要原因之一是稻瘟病的流行。与其它流行性病害相比,年度间流行强度差异更大。以往由于很难作出准确预报,大发生年份因防治不及时造成太幅度减产,而小发生年份因盲目施用大量农药而造 Rice is one of the major high-yielding grain crops in Mudanjiang City, accounting for about 30% of the total output of grain crops. One of the major causes of instability in rice yields over the years is the prevalence of blast disease. Compared with other epidemic diseases, annual intensity of epidemic difference is even greater. In the past, it was difficult to make accurate forecasts. The year when large-scale production was prevented was too short due to prevention and treatment. The small-scale production was due to the blind application of pesticides