Answer
These are the work of blackberry psyllids, also known as bramble flea lice. The larvae of these insects shelter within their host plant’s curled leaves all summer, feeding on sap. By mid-autumn, they have transformed into tiny winged adults, which fly to conifers, where they’ll spend the winter. But they can only fly so far; you won’t find blackberry psyllid feeding sign outside of about a 1-mile range of conifers.
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