Fungal infections are a common issue for houseplants. Whether it’s root rot or leaf spots, fungal diseases can damage and weaken plants and even kill them if left untreated. Preventative measures are the best line of defense, but that isn’t always how things play out. Most fungal infections can be managed or even eliminated through early detection and a solid treatment plan. Here’s how to treat a plant with a fungal infection.
Identify the Problem
Start by carefully inspecting your plant. Fungal infections often show visible symptoms such as:
- White or gray powdery coating on leaves (powdery mildew)
- Dark or brown spots with yellow halos on leaves (leaf spot)
- Mushy or blackened roots and foul smell (root rot)
- Rust-colored pustules, webbing, or blisters
Correctly identifying the issue will help determine the best method to treat a plant. If you’re unsure, consult a local nursery, extension service, or take a picture and conduct a Google Image search.
Isolate the Infected Plant
Fungal spores can easily spread through air, water, or contact. Move the infected plant away from healthy ones to prevent cross-contamination. Clean any nearby surfaces or tools that may have come into contact with the plant to reduce the odds of spreading the infection.
Remove Affected Parts
Use sharp pruning shears to cut off any visibly infected leaves or stems. Throw infected trimmings in the trash. Do not compost infected plant material. Clean your pruning shears when done to avoid spreading spores.
Routinely remove dead growth as necessary, which can develop mold and lead to bigger problems.
Improve Air Circulation and Light
Fungi thrive in moist, stagnant environments. A lack of airflow creates the perfect breeding ground for fungi, but you can rectify the situation by improving airflow. Increase airflow around your plant by spacing pots further apart. Consider using a fan in indoor spaces to ensure regular air circulation.
Ensure your plant is getting adequate light based on its needs. Dark, damp environments encourage fungal growth. Low-light plants are more susceptible to fungal growth, so be especially mindful of the conditions.
Adjust Watering Habits
Overwatering is the primary issue behind most fungal infections, especially root rot. Prevent fungal infections by giving the soil time to dry between waterings, while still meeting the plant’s needs.
Use well-draining potting soil and pots with drainage holes, so excess water can drain. Allowing water a path to exit will prevent soggy roots. Lastly, water the soil and avoid watering the leaves. Curved leaves may create enough space to contain water, which can promote fungal growth.
Leaves can collect dust, so cleaning plants is part of routine maintenance. After washing a plant, give it a shake over a sink or tub to jostle any standing water free.
Apply a Fungicide
Hopefully, it doesn’t come to this, but apply a fungicide if the infection persists or is widespread. There are lots of options when it comes to treating a plant with a fungal infection. Treatment options include:
- Chemical fungicides: Commercial products available at most home improvement stores. While these products are effective, they should always be used as directed.
- Organic options: Neem oil, copper-based sprays, baking soda solutions, or sulfur-based products are safer alternatives.
- DIY spray: Mix one tablespoon baking soda and one teaspoon liquid dish soap in one quart of water. Spray affected areas weekly.
Closely monitor a plant during treatment and be prepared for a long game. Treating a fungal infection in plants can take weeks or even months to resolve. The plant may require several applications of a treatment solution. Keep an eye on the plant and be ready to apply additional treatments as needed.
Repot if Needed
For severe root rot or systemic infections, you may need to repot your houseplant. Gently remove the plant, gently shake as much of the potting soil away as possible, and trim all infected roots. If you need to trim the roots, the plant can likely go back into the same container. Clean the container with a bleach solution to effectively kill any spores or bacteria on the container. Rinse the remaining healthy roots and plant using fresh, sterile soil.
If you decide to upgrade to a larger pot, make sure that the container is clean, and wash the old pot before storing it.
Monitor for Recovery
You can treat a plant with a fungal infection with time, and most plants can bounce back with proper care. Prevention is key, but early detection, prompt action, and creating the right environment will help turn things around. Once your plant recovers, keeping a regular maintenance routine will help it stay healthy and prevent future infections.