利用采自全国12个省市、分属A~G 7个群40个生理小种的146个菌株对中早39进行了稻瘟病抗谱测定。结果显示，中早39对籼型小种的平均抗谱为82.9%，对粳型小种的平均抗谱为71.2%。中早39对不同省市的稻瘟病菌株的抗谱是不一致的，对黑龙江、辽宁、陕西等3个省份菌株的抗谱较低，均为40.0%；对陕西以南9个省（市）菌株的平均抗谱为82.8%。其中，中早39对浙江、贵州和广西的菌株抗谱分别为92.9%、93.1%、100%，说明中早39在这3个省份可以作为稻瘟病抗性育种的抗源使用。

One hundred and forty-six isolates of Magnaporthe oryzae, the causal pathogens of rice blast disease, obtained from 12 provinces was used to examine the resistance spectrum of Zhongzao 39. These 146 isolates belonged to 43 races in 7 Chinese groups. The results indicated that Zhongzao 39 was resistant in 82.9% indica M.oryzae races, and resistant in 71.2% japonica M.oryzae races. The resistance spectrum of Zhongzao 39 varied in different isolates. It showed 40.0% resistance to the isolates from Heilongjiang, Liaoning and Shaanxi Provinces. It showed an average of 82.8% resistance to the isolates from 9 provinces in the south of Shaanxi. The resistance was 92.9%, 93.1% and 100% in Zhejiang, Guizhou and Guangxi respectively, which suggested that it can be used as a resistance source in these provinces.