Wednesday, March 23, 2011

Apple powdery mildew

Today Idared apples were at tight cluster with some petal color showing through as seen in the first picture below. The second picture shows a healthy bud on the left and a reddish, mildewed bud on the right. Although much of the exposed surfaces appeared to have been "washed off" by recent rains, as suspected there were abundant mildew spores (conidia) present on the more protected surfaces (last picture). Cool, damp weather is more conducive to scab development than mildew but it is obvious that spores will plentiful when the temperature turns warmer again (53F+).