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Studies on control of rice blast by alternatively planting diverse rice varieties in a hilly region

LIU Er ming 1,2 ,ZHU You yong 3 ,LIU Xin min 4, Zhang Shun yuan 4,LIU An min 4,YE Hua zhi 2 (1 Phytopathlogogy Laboratory, Sichuan Agricultural University, Ya'an, Shichuan, 652000,China; 2 Hunan Plant Protection Institute, H  
On the basis of cluster analysis of RGA PCR DNA fingerprinting, four combinations composed of two popular high yielding blast resistant hybrid rice varieties and two interplanting rice varieties with high quality and susceptibility to blast were planted in plats and in farm fields of hilly Qidong area. The results indicated that when the susceptible varieties were grown alternatively with the resistant ones, leaf and panicle blasts of the susceptible varieties reduced by 48.86%~79.91% and 12 38%~63 57%, respectively, compared to the pure stand susceptible varieties. The planting patterns had little influence on leaf and panicle blast of the resistant varieties. The rice grown alternatively increased the grain yield ranging between 1 57%~12 71% over the pure stand rice. Therefore, it is proposed that strip planting at the 1∶5 row ratio of high quality and hybrid varieties which had diverse genetic background and contrasting plant height could be effective in control of blast and improvement of rice grain yield.
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