What's eating my betula utilis var. jacquemontii?

Betula utilis var. jacquemontii is most threatened by the bronze birch borer, a wood-boring beetle that kills branches from the top down, especially on stressed trees. Birch aphids and leaf miners cause cosmetic damage but rarely threaten tree health. Keeping the tree well-watered is the primary defence.

D-shaped exit holes in bark; serpentine galleries under the bark; crown dieback progressing downward; canopy thinning and branch death Avoid drought stress — water deeply during dry spells; remove and chip infested branches promptly; systemic imidacloprid soil drench provides protection on high-value trees; plant in partial shade to reduce bark heat stress

Dense colonies on shoot tips and undersides of leaves; sticky honeydew drips below the canopy; leaves may yellow and curl slightly Strong water jet dislodges colonies; insecticidal soap or neem oil for heavy infestations; ladybirds and parasitic wasps usually provide adequate natural control

Pale or brown blotch mines inside leaves; early leaf browning from midsummer; repeated attacks weaken young trees Rake and destroy fallen leaves in autumn; systemic neonicotinoid soil treatment for severe, repeat infestations on young trees; encourage parasitic wasps by avoiding broad-spectrum sprays