Great reference book for insects and diseases
- Great reference book for insects and diseases of woody plants
|Poplar Twiggall Fly Photo by Utah State Extension|
With this book, it’s easy to find out that the first one is Cooley Spruce Gall (page 140) and its mostly a cosmetic issue which usually doesn’t require intervention. The second one is caused by Poplar Twiggall Fly (page 141)which also doesn’t do much damage to the plant.
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