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测定玉米褐斑病的适宜侵染时期及不同叶龄玉米叶片浸提液对褐斑病菌休眠孢子囊萌发的影响。结果表明,不同叶龄玉米感染褐斑病的程度不同,5~7叶期玉米较易感病,其中,5叶期玉米上褐斑病发生最重,郑单958和浚单20病情指数分别为51.1和32.5,显著高于其他叶龄。郑单958和浚单20的玉米叶片浸提液均能提高褐斑病菌休眠孢子囊的萌发率,其中,以第5片叶的浸提液对休眠孢子囊的萌发提高最显著,郑单958和浚单20第5片叶的叶片浸提液分别比对照的萌发率提高15.1%和38.8%。因此,5~7叶期玉米易感褐斑病,玉米褐斑病的最适宜侵染时期为5叶期。
To determine the suitable infection period of corn leaf spot and the effects of corn leaf extracts at different leaf ages on the dormancy of brown spot spores. The results showed that different degrees of corn leaf spot were affected by brown leaf spot. Corn at 5 ~ 7 leaf stage was more susceptible to the disease. Among them, brown leaf spot occurred most frequently in corn at 5 leaf stage, and disease index of Zhengdan 958 and Xundan 20 respectively 51.1 and 32.5, significantly higher than other leaf age. Zhengdan 958 and Xundan 20 maize leaves extract can improve brown spot spores dormancy sporangia germination rate, of which, the fifth leaf extract of dormant sporangium germination to improve the most significant Zhengdan 958 Compared with the control, the leaf extract of the fifth leaf of Xundan 20 increased by 15.1% and 38.8% respectively. Therefore, the 5 to 7 leaf stage susceptible corn leaf spot, maize leaf spot the most appropriate period of infection is 5 leaf stage.