3. Fruit temperature fluctuations and leaf removal. Wide fluctuations in temperature can also induce cracking. This is true especially when plants have been de-leafed too early leaving fruit without protection. The exposed fruit heats up dramatically in the sun. At night it cools relatively quickly and the differential is bigger than it would have been had the leaves covered the fruit. The expansion and contraction of the epidermis and its cells can result in cracking.
Thanks for those links Michael ,I think this explains the problem i have,the temperature differences here between day and night during summer can be as much as 30Cdeg,the same tomatoes in the tunnelhouse dont spilt, the daytime temps are only a little bit higher than outside but much warmer at night.
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Richard
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