Foliage Diseases

Vein Spot (fungus Gnomonia nerviseda)

Key words: Leaf veins, brown lesion, defoliation

The symptoms of vein spot disease on pecan trees are similar to the leaf lesion symptoms of the scab fungus, but the fungus which causes vein spot, unlike the scab fungus, affects only the leaves. Lesions of vein spot disease develop on the veins or petioles of leaves and are usually less than ¼-inch in diameter and are characteristically dark brown to black. Leaves which are severely affected drop, resulting in premature defoliation. The fungus lives in fall leaves over the winter. Fungicides applied for scab plus orchard sanitation will help reduce losses due to this disease. The disease has not been observed to cause significant economic losses in Texas.

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