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How to Get Rid of Fungus on Cup Plant

Updated: November 14, 2022

Fungus can be a common problem for cup plants, which are native to North America and known for their large, cup-shaped leaves. Fungal infections can cause yellowing or browning of the leaves and can even lead to the death of the plant if left untreated. Luckily, there are several steps you can take to get rid of fungus on your cup plant.

Identify the Fungus

Before you begin treating your cup plant for fungus, it’s important to identify the specific type of fungus that is affecting your plant. This will help you choose the right treatment method.

Some common types of fungi that affect cup plants include:

  • Powdery mildew
  • Rust
  • Leaf spot

Powdery mildew appears as a white, powdery substance on the leaves and stems. Rust causes orange or reddish-brown spots on the leaves, while leaf spot causes dark spots with yellow halos.

Remove Infected Leaves

Once you have identified the type of fungus affecting your cup plant, you should remove any infected leaves as soon as possible. This will help prevent the fungus from spreading to other parts of the plant.

Be sure to use clean pruning shears or scissors when removing infected leaves. This will help prevent the spread of the fungus. Make sure to dispose of infected leaves in sealed plastic bags and throw them away in the trash.

Improve Air Circulation

Fungal infections thrive in warm, humid conditions with poor air circulation. To prevent further fungal growth on your cup plant, make sure it has plenty of air circulation by placing it in a well-ventilated area.

You can also improve air circulation by spacing out your cup plants so that they aren’t overcrowded. This will allow more air to circulate around each plant.

Use Fungicides

If removing infected leaves and improving air circulation doesn’t solve the problem, you may need to use a fungicide to treat your cup plant.

There are several types of fungicides available that are specifically designed for use on plants. Some common types include copper-based fungicides and sulfur-based fungicides.

Before using any fungicide, be sure to read the label carefully and follow the manufacturer’s instructions. Apply the fungicide only to the infected areas of the plant and avoid getting it on any healthy leaves or stems.

Prevent Future Fungal Infections

Once you have successfully treated your cup plant for fungus, it’s important to take steps to prevent future infections. Here are a few tips:

  • Water your cup plant at the base, rather than from above. This will help prevent water from sitting on the leaves and creating a humid environment that is ideal for fungal growth.

  • Avoid overcrowding your cup plants. Make sure they have plenty of space to grow and good air circulation.

  • Keep your cup plants healthy by fertilizing them regularly with a balanced fertilizer.

By taking these steps, you can help prevent future fungal infections on your cup plants.


Can I use a homemade fungicide on my cup plant?

Yes, there are several homemade fungicides that can be effective in treating fungal infections on cup plants. Some common ingredients include baking soda, soap, and neem oil.

How often should I apply fungicide to my cup plant?

The frequency of fungicide application will depend on the specific type of fungicide you are using. Be sure to read the label carefully and follow the manufacturer’s instructions.

Can I save a cup plant that has been severely infected with fungus?

It may be possible to save a severely infected cup plant, but it will require aggressive treatment and may not always be successful. If the infection has spread throughout the entire plant, it may be best to remove it to prevent the spread of the fungus to other plants.