Disease on pothos — Fix & Prevention

What's Happening

Phyllosticta leaf spot on pothos is caused by the fungus Phyllosticta species (primarily Phyllosticta capitalensis) that produces characteristic circular to irregular dark brown to black spots with tan or gray centers. Spots often show concentric ring patterns and may have tiny black fruiting bodies (pycnidia) in the center visible under magnification. Pathogen spreads via water splash, contaminated tools, and infected propagation material, thriving in warm humid conditions above 70% relative humidity.

How to Fix It

1
Confirm diagnosis: look for circular dark spots with tan/gray centers and possible concentric rings; check for tiny black dots in center with magnifying glass
2
Remove ALL affected leaves immediately using sterilized shears; cut at petiole base and dispose in sealed bag
3
Apply systemic fungicide containing propiconazole or thiophanate-methyl following label dilution for houseplants
4
Improve air circulation with fan on low speed to reduce humidity around foliage below 60%
5
Continue fungicide applications every 14 days for 6 weeks total; monitor for new spot development throughout treatment period

What You'll Need

hydrogen peroxide pruning shears cinnamon neem oil

How to Prevent It

Maintain 40-60% humidity maximum; use dehumidifier or fan if needed. Space plants 12-18 inches apart to prevent leaf contact and water splash between plants. Water at soil level only; avoid overhead watering or misting. Inspect new plants thoroughly; Phyllosticta often arrives on nursery stock. Sterilize all propagation tools with 70% isopropyl alcohol.

Go Deeper

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Frequently Asked Questions

What causes disease on my plant?

Phyllosticta leaf spot on pothos is caused by the fungus Phyllosticta species (primarily Phyllosticta capitalensis) that produces characteristic circular to irregular dark brown to black spots with ta...

How do I fix disease?

Confirm diagnosis: look for circular dark spots with tan/gray centers and possible concentric rings; check for tiny black dots in center with magnifying glass. Remove ALL affected leaves immediately using sterilized shears; cut at petiole base and dispose in sealed bag.

How do I prevent disease from happening again?

Maintain 40-60% humidity maximum; use dehumidifier or fan if needed. Space plants 12-18 inches apart to prevent leaf contact and water splash between plants. Water at soil level only; avoid overhead w...