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I get this problem on my tomato leaves every year around this time it seems like. The older affected leaves get crispy after time goes by. This happens on Brandywines, Celebrities, Empires, Betterboys. Can't remember it happening on peppers, but right now I have peppers, summer & winter squash, corn, and pole beans that do not have this "problem" on them so it is only affecting my tomotoes or it could possibly just be the row they are in. I do rotate my plants around in the garden every year.

I use chlorantholanil weekly but I guess it doesn't work on it. What in the world is it?

Environment & Growing Conditions:

The tomatoes are grown in the ground in a silty clay loam type soil. It has been dry, hot, and humid here lately, about the same time this started I'm guessing.

I water them with drip tape about every 2-3 days at these ambient temps, which is in the 90's.

In the winter I allow my chickens to graze the crimson clover I sow in the fall and let them poop in the garden. Spring time comes and I fence the chickens out, till in the clover and poo. When I get my drip tape laid out, I use a water soluable fertilizer (ultra sol 20-20-20) about once per week through the drip tape at a rate of 120 ppm N.

Last years soil test:

  • pH 7.2 (added sulfur haven't tested again, should be 6.5-6.8).
  • P 231 ppm.
  • K 408 ppm.
  • Calcium 2672 ppm.
  • Magnesium 317 ppm.
  • Sulfur 20 ppm.
  • Boron 1.1 ppm.
  • Copper 2.3 ppm.
  • Iron 106 ppm.
  • Manganese 428 ppm.
  • Zinc 16.1 ppm.
  • Sodium 17 ppm.
  • Organic Matter 4.9%

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    As background "Chlorothalonil is an organic compound mainly used as a broad spectrum, nonsystemic fungicide" also highly toxic to humans if inhaled
    – kevinskio
    Jun 24 at 11:13
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    Looks cultural/environmental more than anything - what are you growing the plants in, pots, the ground, growbags? If its pots, what size pots, what soil? What's your watering/feeding regime? Please edit your question to include this information...
    – Bamboo
    Jun 24 at 13:47
  • More info added to help. Jun 24 at 15:11
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    Thanks for the update. From your post I assume the tomatoes are in the same spot every year and you notice the same issue also every year?
    – Stephie
    Jun 24 at 15:52
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    Question was edited to maybe make things more clear. Jun 24 at 17:42

1 Answer 1

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It looks a lot like the chlorosis and leaf-drying/crisping that is caused by Verticillium wilt, although it does look a bit different than what I'm used to. It might be another species of Verticillium than I'm used to. Or it could be Fusarium.

Fungicides aren't supposed to be effective on it, but regular fertilization can help improve the health of the plant and its lifespan. It's said to be incurable, soil-borne, etc. It causes dehydration symptoms. Foliar fertilizer sprays can be helpful, since the disease inhibits transport of water/nutrients from roots. It causes blotchy yellow chlorosis on parts of leaf edges. It can cause V-shaped chlorotic and/or crispy lesions on some leaves, a lot like in your first picture.

Note that resistant plants can still potentially get it, and some plants are only resistant to one species of it.

Some of the tomatoes you mentioned are resistant.

It's very hard to eliminate it altogether from a garden once it's there, but you can try solarizing soil, making sure there's no infected debris, no perennial host plants, etc. No infected weeds. Don't buy new plants with blotchy yellow chlorosis.

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    Yes I failed to mention that the leaves do get crispy after time. I do have one, if not both, of those diseases in my soil which years ago I confirmed by cutting the stem near the root and seeing the brown veins. I actually think you are correct. Jun 25 at 14:05

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