Q.What Is This Growth On Forsythia
Very old forsythia. Just noticed lots of these “growths” on oldest branches. Insects? Disease? See photo. Thanks in advance

GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on June 29, 2022
This is likely what is going on:
https://www.gardeningknowhow.com/ornamental/shrubs/forsythia/forsythia-gall-treatment.htm
http://plantclinic.cornell.edu/factsheets/forsythiagall.pdf
http://pnwhandbooks.stage.extension.oregonstate.edu/plantdisease/host-disease/forsythia-stem-gall
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