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White powder like substance on my white pine #580210

Asked July 15, 2019, 11:09 AM EDT

I have three white pines that have a white powdery substance on their trunks. What is it and will it spread? What do I do ?

Kalamazoo County Michigan

Expert Response

This is the work of the white pine bark aphid. (Usually appears much earlier than this but it can have up to four generations per season)

https://www.canr.msu.edu/news/pine_bark_adelgid_becoming_active_in_white_pines

Thank you for your question! Rebecca Finneran Michigan State University Extension Senior Horticulture Educator Learn how t be a Smart Gardener here www.migarden.msu.edu Replied July 15, 2019, 2:31 PM EDT

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.

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