玉米弯孢菌叶斑病产量损失测定及药剂防治

Control and Determine of Yield Loss on Maize Curvularia Leaf Spot

玉米弯孢菌叶斑病产量损失测定结果表明,产量损失率与玉米品种及弯孢菌菌株密切相关,相同菌株对不同玉米品种及不同菌株对相同玉米品种产量影响有差异,产量损失幅度为10.10%～48.62%;玉米弯孢菌叶斑病影响玉米产量构成,使玉米穗变短、细,百粒重减少。通过药剂防治试验结果看出,药剂防治能有效地防治玉米弯孢菌叶斑病。70%代森锰锌WP500倍液防治效果最好,达95.46%。

The yield loss determination of maize curvularia leaf spot showed that there existed significant corre-lation between yield loss and corn varieties or curvularia strains.There were different effects on corn yield loss that same strain to different corn varieties or different strains to same corn variety.The range of corn yield loss was10.10%～48.62%.This disease influenced the factors of corn yield constitution,the ear became shorter and thinner,the hundred-grain weight reduced.The result of control trial showed that mancozeb70%up was the best fungicide in this experiment,its control effect was95.46%.