This is the second year I've had spots develop on the leaves of my Granadero Roma tomatoes (from Johnny's seeds). Today is the first real day of hardening off, but these spots have been developing indoors over the last two weeks.

Last year I thought it was some kind of fungus. I disposed of affected leaves, sprayed with copper fungicide and put a fan on them indoors (albeit late in the game). The plants did produce abundantly.

This year, the fan has been on them practically from the get go, and this still showed up. It's the same varietal as last year, and it's not spreading. Could it be seed-borne?

Thanks in advance.

I'd be more concerned about the crispy edges of the leaves in the pics. That can indicate fertilizer over-dose and/or salt build up in the soil - which can also be white spot related.

So what is the mix they are in and what and how often have you been feeding them?

Dave

I tried an experiment cutting back on watering this year, where I was bottom watering deeply twice a week only. The salt build up in the soil rings true simply because there may not be enough additional waterings to dilute?

The other 5 varieties of tomatoes aren't affected.

I will suspend all fertilizer and water alone from now on - but they only have a week and a half left of hardening off. We are going to transplant the weekend of the 27th.