Sichuan,Chongqing and Guizhou are among the most important areas for rice blast disease(Magnaporthe oryzae) to take place and cause losses. To investigate the difference in the virulence of blast fungus between the different regions,it will be benefit for prolonging the use of resistance cultivars. In 2012 and 2013,24 monogenic lines of rice for blast resistance of the common background of Lijiangxintuan Heigu(LTH) were planted at the locations of frequent epidemic of blast disease in 21 counties of Sichuan...
blast fungus respectively from 70.00%,60.00%,50.00%,50.00%and 45.00%of the disease fields in Sichuan.The frequency forPi2 to be resistant to the blast fungus from fields in northern part of Sichuan was significantly higher than that in Guizhou(P=0.0066).T
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