Troubleshooting
Monarch Birch problems — and how to fix them
Monarch Birch (Betula maximowicziana) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Bronze birch borer (Agrilus anxius)
The most serious pest in North America; larvae bore into bark causing upper crown dieback. Healthy, well-watered trees are most resistant. Remove and burn infested branches. No effective home chemical treatment once established in the tree.
Leaf spot (Marssonina betulae)
Brown circular leaf spots appear in mid to late summer, sometimes causing premature leaf drop. Typically cosmetic in established trees. Rake and dispose of fallen leaves to limit overwintering. Fungicide sprays rarely warranted.
Wind damage to large leaves
The unusually large leaves are susceptible to tearing and wind scorch in exposed positions. Shelter from prevailing strong winds, especially when young. A sheltered site also helps retain the impressive foliage effect.
Prevent monarch birch problems before they start
Most monarch birch issues are care-mismatch, not bad luck. Dial in the basics:
Monarch Birch problems — FAQ
Why is my monarch birch bronze birch borer (agrilus anxius)?
The most serious pest in North America; larvae bore into bark causing upper crown dieback. Healthy, well-watered trees are most resistant. Remove and burn infested branches. No effective home chemical treatment once established in the tree.
Why is my monarch birch leaf spot (marssonina betulae)?
Brown circular leaf spots appear in mid to late summer, sometimes causing premature leaf drop. Typically cosmetic in established trees. Rake and dispose of fallen leaves to limit overwintering. Fungicide sprays rarely warranted.
Why is my monarch birch wind damage to large leaves?
The unusually large leaves are susceptible to tearing and wind scorch in exposed positions. Shelter from prevailing strong winds, especially when young. A sheltered site also helps retain the impressive foliage effect.