Ask a Question forum: Why tomato leaf underside veins are purple

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Raveendrareddykv
Jul 26, 2016 10:33 AM CST
Tomato plants infected with curly top have curled,and the veins on the underside of the leaves are purple
Name: Robyn
Minnesota (Zone 4a)
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robynanne
Jul 26, 2016 10:57 AM CST
Can you post a picture?

Without a picture, my guess is that the plant is not getting the nourishment it needs. There can be a lot of reasons for that. Are you able to get us the picture and some background about where the plant is and how you have been watering and feeding it?
Name: Rita
North Shore, Long Island, NY
Zone 6B
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Newyorkrita
Jul 26, 2016 5:59 PM CST
I agree that it seems like a nutritional deficiency.
Name: Sue
Ontario, Canada (Zone 4a)
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sooby
Jul 26, 2016 6:17 PM CST
I'm not sure I understand the question correctly but the curly top virus the OP mentioned causes purple veins. Is the question how does the virus cause the purpling? I assume somehow it relates to an accumulation of anthocyanin pigment but I really don't know the mechanism. There's a picture here:
https://www.google.ca/search?q=curly+top+virus+purple+veins&...
Name: Robyn
Minnesota (Zone 4a)
Seed Starter Vegetable Grower Herbs Enjoys or suffers cold winters Tomato Heads Garden Photography
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robynanne
Jul 27, 2016 5:05 AM CST
Lol, oh. I completely missed the statement that they already have a disease.
Name: Joanne
Calgary, AB Canada (Zone 3a)
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Joannabanana
Jul 27, 2016 6:43 AM CST
The plants need fertilizer. I like to use a granular type that slow releases for about 4weeks. If you use a water soluble type, results will be quicker.
Name: Sue
Ontario, Canada (Zone 4a)
Daylilies Birds Enjoys or suffers cold winters Native Plants and Wildflowers Butterflies Annuals
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sooby
Jul 27, 2016 6:58 AM CST
I don't think fertilizer will help, the infected plants do not recover:

".. tomato leaves curl and roll upward and the main leaf petiole curves downward. In time, the leaves also become leathery, veins turn a purplish color and the interveinal leaf area turns yellowish. Infected plants will not recover and eventually the plant stops growing and dies. Infected tomatoes may ripen even when immature; however, edible size fruits are likely to be bitter. Once definite symptoms are observed, it is best to pull out the plant and destroy it."

From Arizona Cooperative Extension
https://cals.arizona.edu/yavapai/anr/hort/byg/archive/curlyt...

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