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Pine tree, yellow needles dtopping - Ask Extension

I live in Arvada, all of a sudden my pine tree needles are yellowing and dropping, not on the tips, but toward the trunk

This work is supported in part by New Technologies for Ag Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.