Just to update that, having stripped all the affected leaves off, my toms are now finally setting fruit. No idea what they will be like but that’s a good sign.
Don’t dispair @Sheps, toms can be temperamental and the climate weirdness of late may have contributed. I have not had a great first year in my new veg plot, all sorts of stuff that I used to grow well has failed, but we live and hopefully learn.
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
This looks to me like a fungus like Septoria Leaf Spot. There should be a local government agency that deals with this kind of thing and they may be able to tell you what it is. If not, ask a local farmer as they will have had to deal with the same issue.
I would remove and dispose of all affected leaves. This includes any leaves that may have fallen off of the plant. The plant will likely survive as long as the number of affected leaves is not too large. Also, mulch around the base of each plant to create a barrier between the plant leaves and the soil. Water only at the base of the plant to keep the leaves as dry as possible.
Dilute to 1 Tbl/gallon and spray with a hand sprayer. Apply 1 time per week. Spray until the product is dripping off of the leaves and try to get both sides of each leaf.
I don't like using fungicides anymore than most gardeners do but I wouldn't have a single living plant in my garden if I didn't.
Interesting, thanks, it does look like that, already done the removing and disposing, as above, I see it lives on the plants not in the soil and I will be disposing of the affected plants anyway, after I see if I get any edible tomatoes. No spraying for me, though.
Sorry, the ‘government agency to deal with’ bit did make me chuckle - this is Spain! I reported an outbreak of processionary caterpillars (who is this nutter, they thought) oh and a large tree that had fallen on an electricity line near a river and bent it to the ground (more shrugs, yep, we really have got a nutter in this one)
Mountainous Northern Catalunya, Spain. Hot summers, cold winters.
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Don’t dispair @Sheps, toms can be temperamental and the climate weirdness of late may have contributed. I have not had a great first year in my new veg plot, all sorts of stuff that I used to grow well has failed, but we live and hopefully learn.
I would remove and dispose of all affected leaves. This includes any leaves that may have fallen off of the plant. The plant will likely survive as long as the number of affected leaves is not too large. Also, mulch around the base of each plant to create a barrier between the plant leaves and the soil. Water only at the base of the plant to keep the leaves as dry as possible.
I would spray with Daconil Fungicide (Chlorothalonil 29.6%)
Daconil Fungicide Concentrate
Dilute to 1 Tbl/gallon and spray with a hand sprayer. Apply 1 time per week. Spray until the product is dripping off of the leaves and try to get both sides of each leaf.
I don't like using fungicides anymore than most gardeners do but I wouldn't have a single living plant in my garden if I didn't.
LMHmedchem
Sorry, the ‘government agency to deal with’ bit did make me chuckle - this is Spain! I reported an outbreak of processionary caterpillars (who is this nutter, they thought) oh and a large tree that had fallen on an electricity line near a river and bent it to the ground (more shrugs, yep, we really have got a nutter in this one)