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Tomato Disorders
Gray Wall
(Blotchy Ripening)
Found worldwide
Symptoms
Conditions for Disease Development
Affected green fruit have large patches of hard, grayish
or yellowish tissue. The affected fruit appears to be
poorly ripened or to have ripened at an uneven rate with
some patches remaining gray or turning yellow.
The cause is unknown. An association between graywall
and low potassium, low boron, or high nitrogen levels
has been established. The disorder is also more
prevalent when temperatures are very high with low light
levels, and is less prevalent during sunny, mild
conditions.
Inside the fruit, there is uneven coloration of tissue
with some areas having a brown color. Some blotchy
ripening symptoms are similar to those caused by
tomato mosaic virus (ToMV) on fruit. To distinguish the
disorders, ToMV causes mottling and distortion of
foliage, but graywall will not affect foliage.
World Vegetable Center
Control
There are differences in susceptibility among redskinned varieties. Follow a balanced fertilizer program.
How to Identify Graywall
Fruit is uneven in color, both inside and outside, with hardened patches of grayish or yellowish tissue.
AVRDC Publication 04-602
Written by Ray Cerkauskas, Visiting Scientist from Agriculture and Agri-Food Canada. Edited by Tom Kalb. Revised August 2005.
Published by AVRDC – The World Vegetable Center; P.O. Box 42, Shanhua; Taiwan 741; ROC.
tel: (886-6) 583-7801; fax: (886-6) 583-0009; email: avrdcbox@avrdc.org; web: www.avrdc.org
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