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1984,1985年在美国宾夕法尼亚两个地方最适宜的作物管理体系下种植了三个冬小麦品种。用羟锈宁处理种子,粉锈宁和代森锰锌叶面喷雾防治病害。在第6生育期(GS6,Feekes标准)时,在一个大容器内把药混匀,进行叶面喷雾。观察了品种间小区病害进展曲线内面积(AUDPC)、产量的差异和品种×处理间的互作。1984年以前一直抗白粉病的Tyler品种,1985年变成三个品种中最感病的品种。种子处理和叶面喷雾都降低了白粉病严重程度,其中叶面喷雾效果较佳。在33％的品种×处理×地点评估中,种子处理与叶面喷雾结合使用,均比二者单独使用对减轻白粉病的效果好。品种×处理×地点评估中,种子处理+叶面喷雾结合,在降低叶枯病和叶锈病严重度方面,比单独处理的效果分别高25％和17％。在整个试验中无论单独叶面喷雾或与种子处理结合,产量均有提高。
Three winter wheat varieties were planted in 1984 and 1985 under the most suitable crop management system in two parts of the United States, Pennsylvania. Treat the seed with triadimefon, triadimefon and mancozeb foliar spray to prevent diseases. In the sixth growth period (GS6, Feekes standard), the medicine is mixed in a large container and the leaf surface is sprayed. The inter-species area (AUDPC), the difference of yield and the interaction between varieties × treatments were observed. The Tyler variety, which had been resistant to powdery mildew until 1984, became the most susceptible variety of the three varieties in 1985. Both seed treatment and foliar spray reduced the severity of powdery mildew, and foliar spray was better. In 33% of the varieties × treatment × site evaluation, the combination of seed treatment and foliar spray were better than either alone in reducing powdery mildew. In the variety × treatment × site evaluation, seed treatment + foliar spray combination was 25% and 17% higher than the effect of the single treatment in reducing the severity of leaf blight and leaf rust respectively. Yields have increased throughout the experiment whether foliar spray alone or in combination with seed treatment.