I have several tomato plants and they were all fine last week. All of a sudden the leaves on one of the plants have brown spots & it has started dying from the top down?? The leaves are getting crispy....I'm worried this will spread to the other plants and kill them off. So far it in only on the one though. Please help before they all get this! Oh & I'm not sure if this matters but it is a Big Boy or Better Boy plant. Thank you!!

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