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four_storys

Brown metallic spots on underside of leaves

9 years ago
last modified: 9 years ago

About a week ago, I noticed aphids and little white bugs had moved in on most of our 20 tomato plants. Within 2 or 3 days I sprayed them with a mixture of 2 tsp Dawn dish soap to a quart of water. This mostly took care of the bugs. We had rain a couple of times after this. Now, I've got brown spots on lower to mid leaves that appear metallic on the underside. The attached pictures are from various plants, that are otherwise doing well. Is this aphid damage? Damage from the Dawn? (I've since read that may not be so good for them..should have listened to the husband) Something else entirely? I can't find anything similar online. Its showing up on disease resistant hybrids (Yaqui) and heirlooms. I havent noticed spreading as of yet, but some of the leaves completely dry up and die, and some of the stems then just fall off. I've posted a full plant pic of my Sun Sugar but its pretty busy so I can post a pic of another full plant if it would be helpful.


four_storys's ideas · More Info

four_storys's ideas · More Info

four_storys's ideas · More Info

four_storys's ideas · More Info

four_storys's ideas · More Info

Comments (6)

  • 9 years ago

    How are you fertilizing your plants?

  • 9 years ago

    We added compost a few weeks before they went in the ground in mid-May, and I fertilized with MiracleGro Tomato around the first of June, it is 18-18-9 (Not sure on the 9). Somebody on another site suggested this may be a P deficiency, so I grabbed some 6-12-12 ( because they more than enough foliage and I didnt want to add too much N) with added calcium and plan to feed them that tonight or in the am. This is only our second year doing tomatoes so everything we encounter is new. We didnt have aphids last year, just what I suspected to be russet mites. The aphids are back, although in smaller numbers, so I'm putting on some neem oil this evening after the sun goes down.

  • 9 years ago

    I was wondering whether it might be P deficiency, too, but given how you've been fertilizing, it's unlikely.

    It's possible that the bottommost leaves were damaged by mites or some other sap-sucking pest (I say mites, though, because there is damage on the stems and because mites are one of the few pests that frequently work their way up from the bottom of the plant), and your soap spray burned those parts of the plant because its "skin" had been compromised by the pest activity.

    If the soap spray had been too strong, the newest foliage would have been damaged, and it looks like that's not the case.

    As long as the new growth is healthy, I think your plants will be fine. Prune off the older, damaged foliage, as it's not going to contribute much to photosynthesis, and molds and fungus love to colonize necrotic tissue, so you want to get rid of that.

  • 9 years ago
    last modified: 9 years ago

    How are the plants doing? No sign of wilting, I hope? Something clicked for me reading another post somewhere else, and it occurred to me that your little bugs may have been thrips, and you might have TSWV. So I wanted to check in.

  • 9 years ago

    They are doing fine so far. I hit them pretty hard with neem, pruned off the damaged stuff, and there wasnt much sign of progression up the plant. All of my fruit is healthy looking (there's over 160 non-cherry fruit total)...would that be the case with TSWV? Nothing looks wilty, although I have noticed that even my newest growth is a little splotchy with light green, like a mild magnesium deficiency, but I amended with epsom when I planted so that doesn't seem likely. Thought about doing an epsom foliar spray. I'll try to get a picture this morning.

  • 9 years ago

    A picture would be good. Things to worry about are: brown or white rings/raised lumps/marbling on new fruit, a fine black or bronze speckling on newer leaves, leaves pointing down so it looks like the plant is wilting.

    I'm probably just being paranoid, but I wanted to give you a heads up, as if it's TSWV, there are consequences for other plants in the garden. But if you aren't seeing those other signs, it's unlikely to be TSWV.

    TSWV can present in many different ways, so it can sometimes be hard to diagnose.

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