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Tomatoes and Tomato Spotted Wilt Virus

By farmerdill
March 3, 2014

Tomato spotted wilt first appears as light brown flecks on leaves. This is followed by growing brown spots, drooping, and finally, full browning and dying. The plants will look wilted. It affects many plants other than tomatoes, but on tomatoes the fruit is also severely affected. Discoloration is the most common effect, but cracking and rot also appear in severe cases. It also degrades the flavor and texture.

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Patti1957
Mar 2, 2014 6:21 PM CST
Thanks for a great article! Thumbs up

I had TSWV affect one of my Black Cherry plants last year. It also got one of my Sweet Linda plants (also a cherry) and one of my Purple Bumble Bees (a cherry type) It is a very nasty virus. Last year it took out 10 of my 80 plants in a hit and miss kind of way. The plants affected were not next to each other and were spread out all over the garden area. It also affected a few of my pepper plants. It seems like it is getting worse each year.


Name: Horseshoe Griffin
Efland, NC (Zone 7a)
And in the end...a happy beginning!
Charter ATP Member I helped beta test the Garden Planting Calendar Hosted a Not-A-Raffle-Raffle Garden Sages I sent a postcard to Randy! I was one of the first 300 contributors to the plant database!
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Horseshoe
Mar 2, 2014 8:26 PM CST
Oh my, so it has now spread all the way to Oregon? I thought it was more prevalent in greenhouses if it appeared in more northern states. Bummer, Patti, but glad it didn't wipe out your whole field.

Nice article, Farmerdill! Thanks! And thanks for the recommendations on the TSWV-resistant varieties.

Shoe
Name: Anna
Central NY (Zone 5a)
I was one of the first 300 contributors to the plant database! Daylilies Organic Gardener Composter Vegetable Grower Butterflies
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RavenCroft
Mar 4, 2014 6:49 AM CST
It's been my understanding that TSWV is always present in the soil. What changes year to year are the conditions under which it will emerge. Some years are more favorable for it (very wet spring) while other years aren't. I only grow about a dozen plants & do so on a 3 year rotation. One of the varieties I always grow is Bonnie Brae's Husky Cherry. This cv can be bought at any box store. 2 years ago, when the virus was at it's height, BB Husky Cherry withstood the onslaught, while all my standard tomatoes succumbed. I will always grow at least one of these for that reason alone, plus the fact that the production is very good, & the taste is delicious. :-)
RavenCroft Cottage .....a daylily place

http://ravencroftcottage.com/Home.html

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Patti1957
Mar 4, 2014 12:50 PM CST
I thought that TSWV was spread by thrips and not a soil born disease? Many weeds are host plants for the thrips. My problem is that I don't want to grow the resistant varieties, I like growing lots of different heirlooms. And my understanding about resistant varieties is that it doesn't mean that they can't get the virus, it just means they are less likely. In my garden last year they didn't seem to care which plant they attacked. I also thought that warm, dry conditions in the spring can lead to earlier and more severe problems with TSW than cool, wet springs. Crop rotation is a good idea as a general practice to detour many diseases.


Name: Dillard Haley
Augusta Georgia (Zone 8a)
Garden Ideas: Master Level Avid Green Pages Reviewer Celebrating Gardening: 2015
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farmerdill
Mar 4, 2014 3:02 PM CST
Concur, TSWV is an insect vectored disease. Crop rotation, soil solarization are good practices for soil borne diseases but nigh unto useless for TSWV. Weed elimination is useful but it has so many host don't count on it. The thrip( several species) are not strong flyers but they can move long distances. The adult thrip has to acquire the virus at the larval stages which probably accounts for the intermittant nature of the disease in some areas. Here it is pretty persistant. http://vegetablemdonline.ppath.cornell.edu/factsheets/Virus_...
Name: Horseshoe Griffin
Efland, NC (Zone 7a)
And in the end...a happy beginning!
Charter ATP Member I helped beta test the Garden Planting Calendar Hosted a Not-A-Raffle-Raffle Garden Sages I sent a postcard to Randy! I was one of the first 300 contributors to the plant database!
For our friend, Shoe. Lover of wildlife (Black bear badge) Enjoys or suffers cold winters Birds Permaculture Container Gardener
Image
Horseshoe
Mar 4, 2014 4:25 PM CST
Ravencroft, it sounds like you are referring more to "late blight" than TSWV with your reference to soil borne and "very wet spring", etc.

And Patti, you're right, "resistance" doesn't mean a plant will be immune to something but rather means it will put up with it longer. If I remember correctly the USDA states if a plant produces an acceptable crop before succumbing to a disease it is considered resistant. Go figger, eh?

Farmerdill, glad you offered some varieties that survive or grow to production. I hope they figure out one day just what makes them survive longer, or impervious to the thrips. Any ideas?

Shoe (freezing but with tiny tomato seedlings coming on strong!)
Name: Dillard Haley
Augusta Georgia (Zone 8a)
Garden Ideas: Master Level Avid Green Pages Reviewer Celebrating Gardening: 2015
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farmerdill
Mar 4, 2014 5:07 PM CST
yes shoe, resistance simply means they put up a fight rather than surrendering at the first threat. Some put up more fight than others. None are bulletproof. The other problem is that this virus mutates so fast that resistance only holds for several years. Many of the early TSWV varieties have already lost the fight. Here is the best scientific article that I have found that is readably by an antique physicist. http://www.apsnet.org/edcenter/intropp/lessons/viruses/Pages...
Name: Horseshoe Griffin
Efland, NC (Zone 7a)
And in the end...a happy beginning!
Charter ATP Member I helped beta test the Garden Planting Calendar Hosted a Not-A-Raffle-Raffle Garden Sages I sent a postcard to Randy! I was one of the first 300 contributors to the plant database!
For our friend, Shoe. Lover of wildlife (Black bear badge) Enjoys or suffers cold winters Birds Permaculture Container Gardener
Image
Horseshoe
Mar 4, 2014 7:06 PM CST
"resistance simply means they put up a fight rather than surrendering at the first threat. "

That has got to be the best definition of resistance I've ever read! Perfect and to the point!

Those TSWV thrips sure must have the perfect vaccine in them to be able to continue on and adjust so quickly. Us humans should be so lucky, eh?

Thanks for the link, I'll read it after I devour a big part of the chicken that is sizzling in the oven, calling my name!

Hope you're surviving this unusual winter down your way.

shoe
Name: Anna
Central NY (Zone 5a)
I was one of the first 300 contributors to the plant database! Daylilies Organic Gardener Composter Vegetable Grower Butterflies
Echinacea Clematis Lover of wildlife (Raccoon badge) Cat Lover Birds Winter Sowing
Image
RavenCroft
Mar 6, 2014 5:03 PM CST
Horseshoe.... That a could very well be. Never heard of it called late blight, but rather just the blight. So this TSWV is definitely insect borne then. Geesch! Just when you thought it was safe to come out of the woods, LOL! Up pops something else. I can't say that I've experienced it yet, but it's good to have a heads up for the future. Thanks.
RavenCroft Cottage .....a daylily place

http://ravencroftcottage.com/Home.html
Name: Horseshoe Griffin
Efland, NC (Zone 7a)
And in the end...a happy beginning!
Charter ATP Member I helped beta test the Garden Planting Calendar Hosted a Not-A-Raffle-Raffle Garden Sages I sent a postcard to Randy! I was one of the first 300 contributors to the plant database!
For our friend, Shoe. Lover of wildlife (Black bear badge) Enjoys or suffers cold winters Birds Permaculture Container Gardener
Image
Horseshoe
Mar 6, 2014 6:27 PM CST
RavenCroft said: So this TSWV is definitely insect borne then. Geesch! Just when you thought it was safe to come out of the woods, LOL! Up pops something else.


Smiling Hah! Yeh, it's always something, eh? But at least these Tomato Spotted Wilt Virus boogers don't attack us humans...I had enough spots (freckles!) when I was a kid and now that I'm much older I feel like I'm wilting quite a bit of the time! I don't need to come down with TSWV. Rolling on the floor laughing

As for blights, there's a whole boatload of various blights. And when something called "late blight" appears early in the year it sure makes for some confusion, eh? No fair!

Shoe (who can't believe NC is once again have ice/sleet pouring down on us tonight. A most unusual winter....)


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