辽宁水稻主产区稻瘟病发生特征分析

利用1999-2012年辽宁省8个水稻主产区（17个观测点）的稻瘟病资料，分析辽宁省水稻主产区稻瘟病的发生特征及发展趋势。结果表明：2001年、2003年和2010年辽宁地区水稻产量显著下降，水稻生产受稻瘟病影响较大。2011年辽宁水稻种植主要集中在沈阳、盘锦、铁岭、辽阳、丹东和营口地区，其余地区也有少量种植。2001年辽宁稻瘟病（主要为穗颈瘟）发生严重，发病率为27.7 %。稻瘟病主要在新宾和清原发生严重，平均发病率分别为17.0 %和16.4 %。辽宁不同熟期水稻以中早熟品种稻瘟病发生严重，平均发病率为10.1 %。辽宁不同区域以辽东地区水稻稻瘟病发生严重，平均发病率为11.2 %。

Characteristic of occurrence of rice blast in major rice producing areas of Liaoning province

Based on the rice blast data at 17 stations in 8 major rice producing areas of Liaoning province from 1999 to 2012, the characteristics of spatial and temporal distribution of rice blast and its tendency were analyzed by a statistical method. The results show that rice yield decreases significantly in 2001,2003 and 2010 in Liaoning province, and the effect of rice blast on yield is significant. Rice cultivation mainly concentrates in Shenyang, Pan- jin, Tieling, Liaoyang, Dandong and Yingkou areas, while the rest areas have also a small amount of planting. The most serious rice blast （mainly for panicles blast） occurs in 2001 ,and the incidence is 27.7%. Rice blast mainly occurs in Xinbin and Qingyuan from 1999 to 2012 ,and both are 17.0% and 16.4% ,respectively. For the species of the different growing period, the serious rice blast occurs in the mid-early maturity species and the average inci- dence is 10. 1%. For the different planting areas, the serious rice blast occurs in the east of Liaoning province, and the average incidence is 11.2 %.