Disease Control Toolbox for Apples: Fungicide Timing

Timing of a fungicide application in relation to disease development is important for achieving the best results.
Disease Control Toolbox for Apples: Fungicide Timing - Articles

Updated: August 8, 2017

Disease Control Toolbox for Apples: Fungicide Timing

Timing of Treatment Based on Apple Disease to be Controlled

Please refer to product labels and the Penn State Extension Tree Fruit Production Guidefor details on chemical use at each timing.

Alternaria leaf blotchApple scabBitter rotBlack rotBlossom end rot (Botrytis)FlyspeckPowdery mildewRustsSooty blotchWhite rot
½-inch green--++----------------
Prepink--++--------++------
Pink--++--+----+++----
Bloom period--++--+++--++++----
Petal fall--++--+++--++++----
First cover spray+++--+++--++----
Second cover spray+++--+----+--+--
Third cover spray++++--+----++
Fourth cover spray+++----+----++
Fifth cover spray++++----++----++++
Sixth cover spray++++++--++----++++
Seventh cover spray++++++--++----++++

++ = ideal timing of material for disease control; + = presence of disease and possible control; -- = control generally is not needed at that time

Instructors

Apple and pear diseases Peach, cherry, other stone fruit diseases Tree fruit disease management

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