Extension > Garden > Diagnose a problem > What's wrong with my plant? > Deciduous Trees > Butternut > Dots, spots or blotches on leaves
Butternut > Leaves > Dots, spots or blotches on leaves
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Anthracnose
Gnomonia leptosyla
- Leaflets have circular brown spots surrounded by yellow tissue
- Infected leaves turn yellow, then brown on the margins, curl and eventually fall off
- Dark brown to black spots form on nut husks
- Nuts drop prematurely
- More information on Walnut Anthracnose
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Leaf spot
Mycosphaerella juglandis
- Small black spots scattered across leaf
- Dark brown veins and leaf tips are common due to many spots forming on leaf veins and leaf tips
- As the disease progresses, leaves yellow and fall off
- In mid-summer leaves appear yellow from a distance
- Occurs on black walnut and butternut
- More information on Leaf spot
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Walnut lacebug
Corythucha juglandis
- Feeds on undersides of leaves with needle-like mouthparts causing white or yellow speckled or pinprick discolorations on leaf surface
- Black dots or specks (droppings) are on the underside of leaves
- Heavy feeding can cause severe discoloration and leaf drop
- Lace bugs are 1/8 to 1/4 inch long; light colored bodies; intricate, lacy wings
- Damage is most noticeable in mid to late summer
- More information on Walnut lace bug
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Downy leaf spot
Microstroma juglandis
- Leaf spots start as small round spots, but often grow together into large angular patches
- Spots are pale yellow on upper leaf surface and powdery white below
- As season progresses, spots can turn dry and brown
- Occurs on black walnut, butternut and hickory
- More information on Downy leaf spot
