Cane girdlers lay an egg near the tip of primocanes, then girdle both above and below the egg. This causes the tips to wilt.
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If tips are not removed below the girdle, then eggs will hatch and larvae will burrow down the cane into the crown.
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This is a part of The Berry Diagnostic Tool - a companion to the NRAES Production Guides for Strawberries, Raspberries and Blueberries