---
title: "My philodendron developed these black and yellow patches almost…"
description: "My philodendron developed these black and yellow patches almost overnight. Any ideas what it is and what I should do to treat it? I watered it three days ago…"
url: "https://getplanta.com/community/lKxUkhzRR_aIJD7o1QvtwQ/r-nbeI0VQYWt-GgHf3fpLg?language=fr"
community: "Pests, diseases and problems"
author: "Mark D"
published: "2024-04-30T22:45:07.471247Z"
language: "en"
image: "https://images.getplanta.com/v1/resize/OYCclxd3ZdoBo82kolqAeiqpVwlWMGFGARUt8kud8xc/BYuJXIR5TUi5fh1YdYSO3A.webp?size=large"
---

[Communauté](https://getplanta.com/community.md?language=fr) / [Pests, diseases and problems](https://getplanta.com/community/lKxUkhzRR_aIJD7o1QvtwQ.md?language=fr)

# My philodendron developed these black and yellow patches almost…

_Publié par Mark D le 2024-04-30_

My philodendron developed these black and yellow patches almost overnight. Any ideas what it is and what I should do to treat it? I watered it three days ago and misted the leaves today.

![Pièce jointe 1 sur 3](https://images.getplanta.com/v1/resize/OYCclxd3ZdoBo82kolqAeiqpVwlWMGFGARUt8kud8xc/BYuJXIR5TUi5fh1YdYSO3A.webp?size=large)

![Pièce jointe 2 sur 3](https://images.getplanta.com/v1/resize/OYCclxd3ZdoBo82kolqAeiqpVwlWMGFGARUt8kud8xc/XztuwKxFS9GTuR-wPH1dVw.webp?size=large)

![Pièce jointe 3 sur 3](https://images.getplanta.com/v1/resize/OYCclxd3ZdoBo82kolqAeiqpVwlWMGFGARUt8kud8xc/fuY5dACbRoiVPyP3_yuAww.webp?size=large)

## 5 commentaires

### Sunny a commenté le 2024-05-01

Looks like Bacterial (or fungal) leaf spot infection which creates yellow circles with black centers that spread. Both can grow with too high humidity, low air circulation and misting. All three keeps water on the leaves too long. Misting and high humidity environments promote bacterial/fungal growth.

I recommend:  
\- Stop misting. Use a humidifier when the plant needs more moisture.  
\- isolate the plant  
\- cut off the infected leaves (use gloves)  
\- disinfect hands/tools🍀🪴

#### Mark D ha respondido el 2024-05-01

Thank you! I was probably a bit aggressive is the amount of misting I did more recently.

#### Sunny ha respondido el 2024-05-01

I never mist unless I’m trying to mist seedlings or propagate succulent leaves. My average relative humidity this time of year is 85 percent. It’s about 65 percent inside. So, I run a ceiling fan 24 hours a day in the rooms with my plants.

#### Mark D ha respondido el 2024-05-01

I live in Southern California and the humidity is low.

#### Sunny ha respondido el 2024-05-01

Then, it’s probably just misting and not high humidity causing the bacterial/fungal growth.

---

_La communauté Planta (https://getplanta.com). La lecture est ouverte à tous. Pour publier, commenter et aimer, téléchargez l'application Planta : https://getplanta.com/download_