Have the red black berries, though they are not turning black. Whay? Pat
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Black Berries
Downtoearthdigs
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on June 20, 2017
When blackberries (Rubus ursinus) won't ripen, the reason is likely the redberry mite (Acalitus essigi). Invisible to the naked eye, redberry mites live inside of blackberries, which they turn into their own personal diners. The mites prevent the berries from ripening. Redberry mites infest all varieties of blackberries, but do the most damage in late-maturing varieties.
https://www.gardeningknowhow.com/edible/fruits/blackberries/redberry-mite-damage.htm
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