Grapevine powdery mildew
clusters, causing yield losses, reduced fruit quality, and increased risk of bunch rot. Powdery mildew thrives under warm and humid conditions; however, unlike [...] serves as a primary entry point for secondary infections, such as Botrytis bunch rot. Leaf symptoms Pale green to yellowish spots on the upper leaf surface [...] cluster development Powdery coating on clusters resulting in loose, misshapen bunches Reduced yield potential Berry symptoms High susceptibility from fruit set