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Utah State University Extension

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Redberry mite is a microscopic pest of blackberry that causes drupelets (small fruit sections) to remain hard and red (or less commonly hard and green) on an otherwise normally-ripened blackberry. The red drupelets can occur from a single drupelet to the entire berry. Redberry mite largely affects late-maturing blackberry varieties. Once it is detected, control is ineffective for that season's crop; control can be obtained in subsequent seasons by a variety of management practices. It was first reported in Utah in 2017 in Davis County

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