---
title: "What is this? On underside of leaf"
description: "What is this? On underside of leaf"
url: "https://getplanta.com/community/UeI834LBSHCioL8MwLcQxA/NcB4yfcrTXuY3vPy38raqA"
community: "Monstera Maniacs"
author: "Meghan"
published: "2024-06-15T20:33:16.662587Z"
language: "en"
image: "https://images.getplanta.com/v1/resize/2WrsV8rDpl51n_rabYlaHB8SoSFaD58gezCKIsqCrj0/X4CRhgN-RkGKlYJ0IWA1tg.webp?size=large"
---

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# What is this? On underside of leaf

_Posted by Meghan on 2024-06-15_

What is this? On underside of leaf

![Attachment 1 of 1](https://images.getplanta.com/v1/resize/2WrsV8rDpl51n_rabYlaHB8SoSFaD58gezCKIsqCrj0/X4CRhgN-RkGKlYJ0IWA1tg.webp?size=large)

## 3 comments

### KaityRich commented on 2024-06-15

Looks like rust fungus.

### 9s commented on 2024-06-15

Seconding rust. Common when there’s too much humidity in the area or the leaf got wet.

You can use copper fungicide to treat it.

#### Meghan replied on 2024-06-17

Thank you!!

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