Many Birches in Massachusetts are weakened by the Birch Leafminer. The larvae of this pest mines between layers of the leaf, causing distinctive kidney shaped blotches. Two generations of this each season will reduce vigor of otherwise healthy trees.
If we have repeated drought conditions the vigor of these ornamentals is lessened further.
Unhealthy Birch trees are more susceptible to the dreaded Bronze Birch Borer so call Bug Busters if you notice leaf mines or any other issues with your White, Grey, Paper, River, or European White Birch.
- White to yellow kidney shaped blotches early – mid summer
- Dried out leaf blotches mid – late summer
- Early leaf drop