Trees need to be protected during wet conditions. The following are strategies for keeping diseases in check on apple and stone fruit during persistent rainy weather.
The forecast for May 15–18 indicates conditions will be favorable for apple scab and bacterial spot on peach infections. If infections occurred during bloom, fire blight symptoms could begin to appear this week.
Bloom is occurring in Pennsylvania apple growing regions—fire blight conditions continue, available mature apple scab spores are very high, and an apple scab infection event is predicted for May 10, 2018.
Severe fire blight and apple scab disease conditions are predicted for May 3–5, 2018! Protection is absolutely necessary!
May 3–5 could be potential infection periods for apple scab and fire blight. Brown rot infection conditions favorable for open peach blossoms this week.
Torino (FRAC Group U6) has a supplemental label to control powdery mildew on apples and cherries.
Tight cluster is the time powdery mildew spores become active. April 24 – 25, 2018 is a predicted scab infection period; be sure trees are covered with protection.
April 15–16 is predicted to be a scab infection period due to green tip present and mature scab spores available. Copper applications recently applied will offer protection.
Dormant copper sprays to manage fungal and bacterial diseases are encouraged. Sanitation is critical for limiting fruit rots in the orchard.
Guidelines are described for properly maintaining one’s weather station post season in preparation for the 2018 season.
Growers can get a jump on management for this fall to control fungal and bacterial disease in apples and stone fruit to mitigate problems in the 2018 season.
Conditions may be optimal for several fungal and bacterial pome and stone fruit diseases in July.