“八五”期间玉米大斑病病菌生理小种研究结果

Research Result on Pysiological Races of Pathogen Organism of Corn North Leaf Blight During "Eighth Five year Plan

从１９９１～１９９５年对松辽平原春玉米区六个不同地区的玉米大斑病病菌生理小种种类、发生频率及分布进行研究，经４年院内温室玉米苗期接种和田间病圃自然诱发条件下，监测得出松辽平原春玉米区有玉米大斑病病菌２号小种，多数地区成为优势种，公主岭、四平地区为主要发生区，发生频率有地区间不同和年度间差异。

The physiological races,occurrence frequency,and distribution of CornNorth Leaf Blight were studied in six different regions in the spring corn belt of SongliaoPlain during 1991-1995. The physiological races were monitored with the methods of theinoculation in the corn seedling stage in a greenhouse and the natural infection in thediseases nursery field for four years. The result showed that No. 2 physiological race existed in the spring corn belt in Songliao plain,and it is becoming dominant race in mostof the area. Gongzhuling and Siping are the serious occurrence area of the race. The occurrence frequency of the race is different between different regions and in differentyears.