HI; My tomato plants have brown spots on the leaves I think it is a fungus blight I use a fungus for brown spots but every year when I plant new plants in May they do good until july then the brown spot start then the plant starts to die all the leaves start turning brown ,and the stems get lumpy and then start dying also, what should I do to stop this?
It has to be tropically warm for tomato plants to succeed. They are said to be harmed by temperatures below 50 degrees F.
Pictures and tomato variety would be nice. Also, is the fungus showing up as tiny spots on the leaves or are whole leaves just turning brown/yellowish. Is the fruit turning brown? If the entire lower leaves are turning yellow it is quite likely that your plant is not getting enough nutrition (or its just fruiting). Assuming it is blight, or any fungus for that matter try the following: 1. don't water the leaves 2. grow the tomatoes in a green-house 3. try blight resistant variety of tomato (Legend) for more blight tolerant varieties read: http://gardenofeaden.blogspot.com/2009/04/blight-resistant-tomatoes.html
