Phomopsis cane canker has appeared and some fields have heavy infestations. Captan will reduce the spread of this disease. Infected canes should be removed from the field. Disease maintenance program for fruit rot protection should be ongoing. Watch for aphids and Japanese beetles.
Grapes are at cluster tightening.
Once the fruit is past buckshot-sized berries, it is less susceptible to infection by powdery mildew and black rot. Black rot symptoms are showing up on fruit. Disease levels in vineyards seem to be low this year so far. Watch for grape leafhopper and Japanese beetles. Grape berry moth trap catches are low but the second-generation should begin soon.