Why are my blackberries variegated?

A:

I have seen the same ripening problem in other berry patches. It seems to be worse with certain varieties and when we have something disrupt the ripening process, like hot temperatures, or short term moisture stress when the berry is filling out about 2-3 weeks before ripening. It definitely is what we call an abiotic stress or disease. Difficult weather and/or water conditions seem to make it happen.

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