Abstract:

 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 decreased 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, Panjin, 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) occurred in 2001, and the incidence rate is 27.7 %. Rice blast mainly occurred in Xinbin and Qingyuan from 1999 to 2012, and both rates 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 incidence rate is 10.1 %. For the different planting areas, the serious rice blast occurs in the east of Liaoning province, and the average incidence rate is 11.2 %.

Key words: Rice blast, Major producing areas of rice, Different growing period, Incidence rate