近年来 ,黑龙江省垦区由于大面积连年种植水稻 ,水稻小球菌核病有逐年加重的趋势 ,佳木斯水稻所、85 4农场、85 7农场和查哈阳农场等地区均有此病发生 ,并有逐年扩大和加重的趋势。 3年以上稻田都有不同程度的发生 ,老稻田发生面积达 35 % ,严重发病田占 80 % ,一般减产 2 0 % In recent years, Heilongjiang Province reclamation area due to a large area of ​​rice, rice sclerotinia gradually increase year by year, Jiamusi rice, 854 farms, 857 farms and Chahayang farm and other areas have the disease and have Each year to expand and aggravate the trend. More than three years of rice fields have occurred to varying degrees, the occurrence of the old rice paddy area of ​​35%, 80% of the serious disease fields, the general reduction of 20%