Is powdery mildew a potential problem?
Hot, humid weather is ideal for powdery mildew and no rain is needed for infection. The conditions right now are ideal for powdery mildew development, and the disease has already been sighted on blueberries and cherries. So keep up the spray program for powdery mildew in crops where this disease can be damaging. Remember not to spray sulfur at temperatures of 85ºF or higher as crop injury is possible at these temperatures. Is there rain in the forecast or are you applying overhead irrigation? Stretching fungicide spray intervals is okay as long as long as it is dry. However, if rain is in the forecast, you will probably have better results with fungicides applied ahead of the rain as most fungicides act as protectants. You can apply soon after a rain event if you use fungicides with post-infection activity. However, this is usually discouraged later in the season when pathogen populations are larger. First of all, it is more difficult to get full control if there are many infective spo
