Causal Agent:
Undetermined etiology

Distribution:
Worldwide

Symptoms:
Symptoms are first observed as flattened, blotchy, brownish-gray areas that develop on green fruit. As the fruit mature these blotchy areas remain gray or turn yellow resulting in uneven ripening. When the fruit is cut open, dark brown vascular tissue can be seen in the fruit walls.

Conditions for Disease Development:
Environmental factors which appear to be associated with this disorder are high nitrogen, low potassium, high soil moisture, high humidity, temperature fluctuations, low light intensity and soil compaction. In addition, certain bacteria, fungi and/or tomato mosaic virus are thought to be involved in gray wall.

Control:
The best control for this disorder is the use of tolerant varieties.

Typical blotchy gray fruit walls.

Typical grayish wall                             The fruit wall has a discolored
discoloration.                                        tissue layer.

Cut through the fruit wall                      Note the external yellowish
showing discolored tissue.                blotchy area, and internal brown
                                                                  layer.