What is the black stuff growing on my plants?

Author: Adolfo O'Kon DVM  |  Last update: Tuesday, November 25, 2025

Sooty mold is a fungal disease that grows on plants and other surfaces covered by honeydew, a sticky substance created by certain insects. Sooty mold's name comes from the dark threadlike growth (mycelium) of the fungi resembling a layer of soot.

How to get rid of black sooty mold on plants?

A simple way to get rid of sooty mold is a hose end sprayer with detergent in it. Just spray the black leaves. Sooty mold is a fungus that is growing on honeydew produced by an aphid or scale. It is not directly harming the plant. You may need to take care of the aphid or scale too.

Is black mold harmful to plants?

Of course, not all black mold is dangerous. Although rare, under the right conditions, Stachybotrys chartarum (the harmful type) can grow on leaves or planter rocks. It's sometimes a dark green color. Consult a mold remediation professional to determine what kind of fungus is growing on your houseplant.

How to get rid of black spot fungus on plants?

Black Spot Tip: Black spot overwinters on infected foliage and rose canes. Always prune away infected stems and dispose of the debris - never compost them. Disinfect your pruners with a household disinfectant after every use. Well-intended trims with dirty pruners spread the infection.

How do I get rid of black aphids on my plants?

The most organic method of control, and often a quite effective one, is the spray of water. Soapy water can help kill the aphids, as it sounds like you know, but a particularly strong jet of water will dislodge/kill most of them physically, as well.

EFFECTIVELY KILL Moldy Top Soil | Treating Mold On Plant Soil | Houseplant Care Tips | Plant Care

How do you treat black mites?

Other steps you can take include:
  1. Wet mop your floors daily.
  2. Use a dehumidifier so your home isn't too damp (which mites love).
  3. Wash your bed linens and pillow and mattress covers in hot water weekly. If you have a dryer, use the high heat setting to dry them.
  4. Use a high quality air filter.

What does black fungus look like on plants?

The tell-tale sign that your tree or plant has been affected by black sooty mold fungus is leaves, twigs, branches, and fruits that are covered in black or dark gray mold.

Can overwatering cause black spots?

Overwatering is the express lane to fungal and bacterial parties, with black spots as their calling card. Excess moisture is like an open invitation for pathogens to crash at your plant's place.

What is the best way to get rid of plant fungus?

To make a natural fungicide out of this, take one tablespoon of vinegar and mix it with a gallon of water. Shake it well and add to a spray bottle. A vinegar mixture can treat most fungal infections on any plant without causing any harm.

How to stop mold from growing on plants?

There are a few simple ways to keep mould off your houseplants:
  1. Don't overwater. Don't let your plants' soil get too wet. Damp soil encourages mould. ...
  2. Cinnamon. After you've scraped up the mould, sprinkle the soil with cinnamon. ...
  3. Keep your plants somewhere light and airy. Anywhere dark and stuffy will encourage mould.

What is the black stuff on my plant leaves?

Sooty mold is usually a black powdery coating that develops on leaves and twigs. Sometimes the black layer may be hard and stick tightly to the leaf.

Does neem oil get rid of sooty mold?

Yes. Spray it with some neem oil. That will take care of any pests that may be creating the residue on which it grows as well as the fungus itself.

Will sooty mold go away on its own?

Once honeydew-producing insect numbers are reduced, honeydew production will lessen, and sooty mold will gradually decrease. It can be difficult to eliminate the fungal disease, but sooty mold can be washed off plants and surfaces with a strong stream of water or soap and water.

What can I spray on sooty mould on plants?

Controlling the insects will stop the rain of sugar water that feeds the sooty mold. The mold itself is difficult to remove, but you can hasten the rate at which it naturally weathers off. Spraying the leaves with insecticidal soap can help soften the sooty coating.

What is the difference between sooty mold and black mold?

Black mildew and sooty mold are often used interchangeably though sooty mold should be used for the black mold that grows on insect excrement (honeydew) that can coat the leaves, stems, and/or fruit of plants.

Should I cut off leaves with black spots?

It may not be ideal as far as looks go, but affected plants should be cut back, and in the fall every bit of garden debris should be thrown away or burned. The spores can overwinter on plant material, but can't survive in bare soil. The good news is that black spot fungus rarely kills the host plant.

What does overwatering look like in plants?

Wilting leaves/yellowing leaves

These soft and limp leaves will look exactly like the leaves of an underwatered plant but the plant will still have moist soil. These leaves may also turn brown or yellow and eventually fall off. Additionally, you may notice water type blisters form on the surface of the leaves.

Can plants recover from black spot?

Once you see the telltale signs of black spot, you can't reverse the disease but you can stop the spread of infection to new leaves. The key to success for any treatment option is persistence: Start treating your roses early in the growing season. Respray them every week or two and after a heavy rain.

How to remove black sooty mold?

You can wash sooty mold off a plant with dilute soapy water. Use cheap dish washing detergent, not the grease-busting kind as these will strip the wax off the leaves of the plants.

What insects cause black sooty mold?

Sooty molds are associated with sucking insect pests (aphids, scales, mealybugs, psyllids) that extract sap from the phloem tissue. Soon after a plant is heavily infested with such a pest, it is usually covered with honeydew. Sucking pests ingest copious amounts of sap to extract nutrients.

What gets rid of black fungus?

Doctors typically prescribe antifungal medications, along with some vaccines, to treat black fungus.

What do black mites look like?

Mites are extremely tiny round black bugs with no wings and eight legs. While they are rarely harmful to humans other than mild irritation to the skin or allergies, black mites in the house could signal elevated moisture levels or a more significant water issue.

What kills mites fast?

The 2 most common treatments for scabies are permethrin cream and malathion lotion. Both medications contain insecticides that kill the scabies mite. Permethrin cream is usually recommended as the first treatment. Malathion lotion is used if permethrin isn't effective.

Why do I feel like something is biting me but nothing is there?

This could be the condition known as Ekbom syndrome, delusory parasitosis, or DP for short. People who have DP have an unshakable, yet false, belief that they are infested with insects, mites, worms or some other parasitic organism, when none can be found.

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