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Symptoms: Symptoms appear as small brownish lesions on older leaves. Spots enlarge and develop a grayish appearance. Eventually, the centers of the lesions fall out. Photo by Plant Disease Clinic |
Gray leaf spot only affects the leaves. |
Symptoms: Symptoms appear as small brownish lesions on older leaves. Spots enlarge and develop a grayish appearance. Eventually, the centers of the lesions fall out. Photo by Plant Disease Clinic |
| Causal organism: | Stemphylium solani |
| Over wintering: | In infected plant material and debris |
| Months of infection: | June-September? |
| Method of dispersal: | Infected seed, wind and rain |
| Infection point: | Direct penetration of leaf tissue and through wounds |
| Control: | Use resistant cultivars. Look for an "St" designation. |
| Labeled fungicides | Several fungicides, including Aliette/Maneb and Kocide 101(Copper Hydroxide), are labeled for control of Gray Leaf Spot on nonresistant cultivars. As always, follow manufacturers instruction. |
| Comments: | Use of disease resistant varieties is the best way to control this disease. |
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