Hi everyone!

This is my first year growing tomatoes in the ground, and am having some trouble with them. We have 4 plants only (wanted to start small), 2 of 2 different varieties. I've been searching and researching already the Problem Solver and other websites through google, and still IÂm unable to identify with certainty what's going on.

Case One: one of the plants started to show brown spots on one side, mostly on bottom leaves. Here is a small piece, pictured:

Underside:

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Top:

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Left the main stem in the ground with two apparently healthy suckers on it, and disposed of the rest of the plant.

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The other variety, started also to show very once in a while some very light brown colored spots, but these are getting more and more yellow, especially on the nerves of the leaves. They are starting to look like variegated tomato plants:

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The past week, we've had too much rain. The tomatoes are under a summer raw cover fabric, but it becomes wet and allows humidity to go through.

I have a chlorothalonil based fungicide, which I would be decided to use, in case of need.

I'll highly appreciate your opinions. Thank you so much in advance!

Carol