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Old August 2, 2008   #7
barkeater
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Join Date: Jan 2006
Location: NE Kingdom, VT - Zone 3b
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I've seen that with certain varieties. Worst I can remember was Prudens Purple. Look up sublethal sunscald, which is a likely culprit. I've seen it a few times in tomatoes that were subjected to plus 90 degree temps and bright sunshine for 3-4 days right after being set out.

One question Linda, in your avatar, did the yellow part turn red or stay yellow and hard? If so, that is sublethal sunscald.
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