Q.Yellow Moss on Weigela
What is the cause of yellow blight or moss on the branches of a weigela tree?

Nikki
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on August 9, 2012
The shrub has etiher yellow moss fungus or a yellow lichen. These articles should help: https://www.gardeningknowhow.com/ornamental/foliage/moss/moss-on-plants.htm
https://www.gardeningknowhow.com/ornamental/fungus-lichen/treatment-tree-lichen.htm
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