Gray wall on tomatoes, also called blotchy ripening, is a not a disease or the result of a pest infestation. Rather it’s a physiological condition associated with environmental factors. The condition affects tomato fruit during the ripening process. Stems and leaves do not show symptoms.
Tomatoes look splotchy, mottled or unevenly ripened. Outward grayish splotches on tomato surfaces may even collapse inward – thus the condition’s name. The inside of an affected tomato may also have grayish, yellowish, brownish, or greenish patches.
Blotchly ripening develops most often on green tomatoes during the ripening process. Varieties which are susceptible to tomato mosaic virus are also more likely to exhibit symptoms.
Several environmental factors can contribute.
Tomatoes affected by gray wall exhibit symptoms on fruit alone. Tomato mosaic virus causes mottling and spotting on both fruit and foliage.
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By Kathy Widenhouse, award-winning writer and owner of Tomato Dirt, a leading online source for growing tomatoes and using them.
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