Troubleshooting
Catalpa bignonioides problems — and how to fix them
Catalpa bignonioides (Catalpa bignonioides) 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.
Catalpa sphinx caterpillars
In its US range, larvae of the catalpa sphinx moth can defoliate trees; usually cosmetic on established specimens and tolerated, or removed by hand on small trees.
Wind and snow breakage
The large leaves and brittle wood catch wind and wet snow, snapping branches; site in shelter and formative-prune to a strong framework.
Leaf scorch and early drop
Drought, drying winds and late frosts brown the big soft leaves, which may drop early; consistent moisture and a sheltered site reduce it.
Verticillium wilt
Sudden branch dieback with internal wood staining indicates this soil-borne fungus; remove affected wood and avoid replanting susceptible trees on infected ground.
Prevent catalpa bignonioides problems before they start
Most catalpa bignonioides issues are care-mismatch, not bad luck. Dial in the basics:
Catalpa bignonioides varieties: common problems
Looking for catalpa bignonioides in general rather than its problems? Read the full catalpa bignonioides care guide — light, water, soil and feeding.
Catalpa bignonioides problems — FAQ
Why is my catalpa bignonioides catalpa sphinx caterpillars?
In its US range, larvae of the catalpa sphinx moth can defoliate trees; usually cosmetic on established specimens and tolerated, or removed by hand on small trees.
Why is my catalpa bignonioides wind and snow breakage?
The large leaves and brittle wood catch wind and wet snow, snapping branches; site in shelter and formative-prune to a strong framework.
Why is my catalpa bignonioides leaf scorch and early drop?
Drought, drying winds and late frosts brown the big soft leaves, which may drop early; consistent moisture and a sheltered site reduce it.
Why is my catalpa bignonioides verticillium wilt?
Sudden branch dieback with internal wood staining indicates this soil-borne fungus; remove affected wood and avoid replanting susceptible trees on infected ground.