2016年黑龙江省玉米大斑病调查与分析

Investigation and Analysis on Occurrence of Northern Leaf Blight of Corn in Heilongjiang Province in 2016

为充分了解黑龙江省玉米大斑病的发生动态及危害情况,2016年选择在黑龙江8个地级市50个地点对玉米大斑病进行调查分析。结果表明,50个不同地理区域玉米大斑病均有发生,但存在显著差异,其中大庆市让胡路区发病最轻,病情指数为1.48,哈尔滨市双城区周家镇发病最重,病情指数为60.37,但8个地级市之间玉米大斑病发生程度不存在显著差异。总体上说,黑龙江省玉米大斑病不同地理区域病害发生不均衡,田间病原物的数量丰富,预测2017年黑龙江省玉米大斑病中等程度发生,局部地区玉米大斑病有严重发生的趋势。

In order to fully understand the damage situation and occurrence dynamic of northern leaf blight of corn in 50 different sites of Heilongjiang Province, diseases investigation were conducted in 2016. The results showed that northern leaf blight of corn had already been occurring commonly in all survey sites. Statistical analysis showed that there was significant difference in disease indexes in different geographical regions. And the lowest disease indexes was 1.48 in Ranghulu District, Daqing City and the highest was 60.37 in Zhoujia Town, Shuangcheng Distrct, Harbin City. But there were no significant difference among different prefecture-level city. In a word, the occurrence of northern leaf blight of corn was unevenly in different geographical regions of Heilongjiang Province. The number of pathogenic fungi were still abundant in field. It was predicted that the disease would be a moderate expression in Heilongjiang Province in 2017, but there would be a high possibility of disease occurrence in some areas.