Grapevine powdery mildew
Pale green to yellowish spots on the upper leaf surface Development of white to grey, powdery fungal growth Powdery coating may also appear on the underside [...] initiating primary infections on susceptible young tissues (leaves, shoots, and inflorescence). In some regions, infected buds can produce ‘flag shoots’ that [...] vineyard. These secondary infections can occur repeatedly during the growing season, leading to an exponential increase in disease pressure between flowering