Penn State Extension
Penn State Extension
Kari A. Peter, Ph.D., Alan R. Biggs
Growers can prevent resistance to fungicides by alternating chemicals by FRAC group also known as "spraying by the numbers."
Kari A. Peter, Ph.D., Montserrat Fonseca Estrada, Tianna Dupont
Asegúrese de saber dónde pasa el invierno la roña de manzana, cómo supervisarla y cuándo es más probable que aparezca.
Conditions were incredibly optimal for many tree fruit diseases during the month of May. Management strategies for pome and stone fruit diseases are discussed.
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.
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.
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.
Consider applying dormant sprays soon to manage fungal and bacterial diseases this season.
Conditions are optimal for fire blight, apple scab, and rust infections. Growers are encouraged to keep trees protected. Other diseases for the fruit grower radar are also discussed.
Conditions are favorable for fire blight and apple scab. Additional tools for the fire blight management toolbox are discussed.
Bloom is well underway in parts of PA and MD. Fire blight and scab disease conditions are in full force now. Growers are encouraged to protect trees.
Depending on your location, the warm weather over the last few weeks may have pushed some fruit trees along. For disease management, consider applying dormant copper and urea sprays soon.