Effect of Powdery Mildew on Apple Yield and Economic Benefits of Its Management in Virginia

@inproceedings{YoderEffectOP,
  title={Effect of Powdery Mildew on Apple Yield and Economic Benefits of Its Management in Virginia},
  author={Keith S. Yoder}
}
  • Keith S. Yoder
Powdery mildew, caused by Podosphaera leucotricha (Ellis & Everh.) E. S. Salmon, is the only disease of apple that thrives during dry spring and summer weather in Virginia (11). The fungus survives the winter in buds, making it difficult to control and, although it can cause fruit russet, its chronic effect on tree vigor and yield is more serious (2). Based on earlier observed yield effects in research plots at Winchester (8,9,11), a special action threshold level at 20% leaf infection was… CONTINUE READING