Occasionally it will cause some distortion of the leaves. If control seems necessary, the use of fungicide sprays applied when symptoms become visible are effective. Among the compounds registered for use in Connecticut is benomyl. Consult the label for dosage rates and safety precautions. The disease is caused by a bacterium.
Symptoms first appear as tiny, water-soaked lesions.
When the leaf is held up against a light source, the lesions are translucent. Over time the lesions begin to form chlorotic halos and resemble leaf scorch and leaf blight. The bacterium is spread by rain and wind. Control is difficult. Rotation out of infested fields should be practiced.