Rust—Tranzschelia discolor
Rust is usually seen first as bright yellow, angular spots on the upper sides of leaves. On the undersides
of affected leaves, spores developing in the lesions give the spots a rusty red appearance. Severe foliar
rust can cause a defoliation, which may also reduce yield. On fruit, rust appears as small, sunken dark
spots. A small area around each spot remains greenish or yellow when the fruit begins to color, and the
lesion often splits open by the time the fruit is ripe. If the surface of a lesion is peeled back, rust-colored,
spongy spore masses can be seen.
Identification | Life cycle
Solutions
Remove and destroy infected twigs, buds, blossoms, and fruit as soon as symptoms appear. Avoid overhead
sprinklers or use a low angle to avoid wetting foliage. Treatment is not usually necessary in home orchards.
If infections are severe, a fungicide application in the spring can reduce or prevent fruit infections. |  Symptoms
of peach rust
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