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Brown spots on my tomatoes!

Hi,
Every night I cover my tomatoes with a plastic covered cage and every
morning I remove the cage from my tomatoes so that they don't cook
inside my little mini greenhouse during the heat of the day. I've been
putting it on because it has been dropping into the 40's, low 50's at
night and I wanted to help the plants stay a little warmer than they
would if I left them exposed.
Well, the other day I noticed that when I took off the cage the plants
had dew on them. I thought nothing of this until yesterday when I
noticed that one of the plants had brown spots on some of the leaves, I
picked off the leaves and hoped for the best. This morning I noticed it
was still on that plant and was also on two other plants! I was
devastated!
I always make sure that whenever I water I don't let any water splash on
any of the leaves because I heard that this is how disease is spread
onto the plants. Could the dew on the leaves also spread disease? I
looked in the new Gardens Alive catalog and saw pictures of Early Blight
and Septoria(sp?) leaf spot, and as far as I have noticed, the leaves
haven't turned yellow they just get covered with more and more brown
spots. I think it is early blight but I am no expert. Is there anything
that I can do to cure this? They sell something called Shield-All
Organic fungicide that I can order but if someone knows a home remedy I
would appreciate it. One last question, should I leave the cage off the
plants from now on even though it is still pretty cold at nights?

Thanks,
Richard
Brooklyn, NY (zone 6)

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