Anthracnose
Sunken brown blotches along the veins and leaf tips, spread in wet weather.
What you'll see
- Tan to dark brown, sometimes sunken spots or blotches, often along the veins.
- On houseplants, leaf tips turn yellow, then tan, then dark brown, and the browning spreads.
- Curled young leaves and early leaf drop; sunken cankers on some tree twigs.
Why it happens
A group of fungi spread by splashing rain or watering. They infect new growth in cool, wet weather.
How to fix it
- Remove and bin infected leaves, and rake up fallen leaves and twigs.
- Prune out dead twigs, cleaning your pruners between cuts.
- Keep leaves dry: don't mist houseplants, and water at the soil.
Keep it from coming back
- Choose resistant species and varieties.
- Thin and space plants for sun and air.
- Keep sprinklers off the foliage.
Sources
- UC IPM: Anthracnose
- Missouri Botanical Garden: Anthracnose of trees
- Clemson HGIC: Houseplant diseases and disorders
General guidance, not a diagnosis. For valuable, edible or outdoor crops, check with a local extension service or plant expert. Use any product exactly as its label says, and keep children and pets away while it dries.