7 Fungal Infection On Succulents? | How To Treat Them |

Although the majority of succulent plants are hardy and resistant to pests and fungus , there can be fungal infections on succulents due to various reasons. 

There could be certain situations where their growing conditions could  change, then there is a high probability of fungus infection.

They could land on your plant from anywhere and start deteriorating the plant in a very short time. They could be that dangerous.

Let us have a detailed look on the impact fungus make along with the remedies we could take to safeguard our succulents.

Fungal Infection On Succulents

What are types of fungal infections on succulents and treatments?

There are few fungal infections common among succulents. Those are a bit different from one another and need different treatment methods.

In this article we are going to discuss about 7 fungal infection on succulents and how to treat them.

Black Sooty Mold

This fungi will do a minimum harm to the  succulents. Black sooty mold is  the least annoying and the harmful fungi to the succulents.

In case a black sooty mold has invaded your plant, that really means a sap sucking pest such as mealybugs, aphids, whiteflies, and scale have invaded your plant.

Once the plant is suffering from that, there will be black or dark brown superficial fungal growth emerging on aerial parts of the plant. You  could commonly spot them in the upper leaf surfaces.


To treat this, what you could do is, spray a solution of horticultural oil or neem oil on the surfaces where they have damaged.  You could do this in the early evening.

Neem oil is less poisonous as well as a productive fungicide which could be more efficient.

It could overcome the sooty mold menace from our succulent, especially the one which is heavily infected.

Fungal Infection On Succulents

Leaf Spots

Succulents could get a lot of  fungal leaf spot diseases. Leaf spots do not harm the plants significantly even though it will not look good aesthetically.

Once the fungus dominates and takes over the control of the plant, the small spots will get bigger and will tend to look like a blotch.

Eventually, it will end up deteriorating the plant. However, if you take precautions at the initial stage it will not be a trouble as the growth progresses.


You could conduct several remedies which are safer and convenient to treat the succulents infested by leaf spots.

You could simply apply an all-purpose fungicide on them. Otherwise, you may spray an adequate amount of  baking soda  for the succulent. You may use half a teaspoon of it per gallon of water.

Fungal Infection On Succulents

Grey Mold

You could call this as Botrytis Cinerea commonly. We can easily recognize this fungus as it indicates its symptoms well in advance.

They will try to show it from forming circular gray, brown spots on the leaves as well as on the stems too. They could grow fuzzy with mold over time once the fungus gets severally spread.

This will survive in the moist. If the plant is in a shady environment and if the ventilation is also not that great, Grey cold will start liking it more.

Furthermore, they will spread faster when the temperature decreases. You  could commonly spot this  in seasons like early spring or in summer.

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Once you notice that your succulent is struggling with Grey Mold well in advance, you could try using a homemade fungicide such as dishwashing soap to control that.

Having said that it is vital to ascertain that it has not got any greasers or bleach.

You should  trim the damaged areas if your plant has got serious gray mold infection. In addition to that, please do refrain in watering from the top.

Fungal Infection On Succulents


This is a cluster of fungal diseases which is caused by fungi .  They belong to genus Colletotrichum.  

They will form in circular, pale, sunken, or brownish spots. As a repercussion of this plant tissues will get dry and become stiff. 


Removing the damaged leaves is the only remedy which we could do to protect our succulent from this fungus.

Apart from that, you could change the soil and the pot of the infected plant. In this circumstance, ensure that all the equipment is clean enough and with good hygiene.

So that you could stop this fungal disease spreading all over.

In case there are still any leftover fungus,  you could utilize fungicides which consist of chlorothalonil.

Further you may use Copper sprays which consist of  copper diammonia diacetate, propiconazole, and systemic fungicide such as thiophanate-methyl.

Fungal Infection On Succulents

Fusarium Wilt

Unfortunately, this is the type of fungus for which we do not have any remedy to cure. It is not possible to heal this fungus.

It could reach the plant from the roots and over time it could start reproducing in the vascular tissues.

This will avoid the plant circulating water up in the plant. As a result of this, the plant will go through immense stress along with wilting, yellowing.  Chances are that, eventually it could  perish too


Unfortunately, nobody has come up with a remedy to heal a plant which is affected by fusarium wilt.

However, the best productive way to treat this plant is to take off and dispose of the damaged plant faster.

Further it is mandatory to remove the fusarium-infected soil too. It will avoid the fungus spreading further.

Fungal Infection On Succulents

Root and Crown Rots

It will be somewhat difficult to recognize a plant affected by root and crown rots when compared to other fungal attacks. In fact, they do not show any specific symptoms to indicate that they have got this fungus type.  

Having said, once a plant gets  this fungus, it will begin to wilt along with brown leaves.

Over time, they will fall since the stems also start to rot. Roots will tend to turn brown underneath the soil and it will easily break off if the soil is teased away smoothly.

In case if it affects the root crown, fine feeder roots will tend to stay healthy in white to a tan color.

However, once you clean the plant from soil , brown spots will start appearing on the cortex on the roots. Further they will form on the root crown and on the base of the stem as well.


Root and crown rot is not very responsive for treatments unluckily, but if we reduce the moisture you could control it.

Hence, ensure that you provide well-draining soil mix. Simultaneously, make sure that you supply only a right amount of water for your plants which could fulfill the plant’s requirements.

Apart from that you should  remove mulch greater than four inches. It will help the plant to not stay in overly wet soil.

Fungal Infection On Succulents

Powdery mildew.

You could identify a plant which has got  powdery mildew very easily. It could grow either superficially or epiphytically.

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Powdery mildew has classic white or grayish dust or powdery coating.

They will first begin to look like circular, powdery white spots on the leaves as well as on the stems.

When the infection gets worse, those spots will turn yellow, brown and will end up turning black  at the end. Further, the plant’s leaves will tend to  twist and disorder. After that it will wilt and end up getting killed. 


If you consider a mild case of powdery mildew, they could go away on their own. However, if you wish to apply a fungicide, the best productive and the efficient one would be copper.

Do not forget to adhere to the instructions on the label before you proceed as chances are that an excess amount of copper will be harmful to the plant and to the soil as well.

You may also treat them while using a mix of baking soda and liquid non detergent soap along with some water.

You should add one tablespoon of baking soda and one teaspoon of soap with one gallon of water for this mix and spray mixture appropriately on the damaged surfaces of the leaves

Keep in mind to water the plant well before adding this mixture. Baking soda could factor for sunburns. As such, it is better to first try one or two leaves first to not have any issues.

Fungal Infection On Succulents

How to avoid fungal infections in succulents?

You need to be aware of the remedies you could do when your succulents face a fungus infection.

You could use fungicides such as copper methylthiophanate, benomyl, dicyclidine, etc. Out of these copper is the  highly recommended fungicide to use.

Having said that, bear in mind that  you could prevent only the spread of the fungus to other plants  from copper and other fungicides.

It is very vital to identify the fungus type. Based on that you could do the relevant most efficient treatments . 

You could use the Copper fungicide to treat diseases like leaf curl, powdery mildew, black spot, rust, anthracnose, fire blight, and bacterial leaf spot.

This comes very handy in using vegetables, roses, fruits and turf in addition to using for succulents too. 

When you use copper fungicide, mix 0.5 to 2.0 oz. of copper fungicide for each gallon of water .

You may proceed with this, if you are only aware of the exact infection which has invaded the succulent. There are certain fungi types which don’t require any of the fungicides.

Ensure that you apply sufficient fungicides on the damaged parts of the succulent. Do it through. Keep doing it every 7to10 days.

Natural  fungicide for succulents

DIY fungicide is  a very productive natural fungicide especially during the dormant period.

It has the ability to overcome the damage  the succulents get from  fungal diseases as well as from  the bacterial diseases.

You would only need to get ground limestone and powdered copper sulfate to create this fungicide. You could add it for 4-4-50 strength  during the succulents dormancy period.

You simply have to blend four parts of each ingredient along with water. You could use 50 gallons of water for this purpose

Fungal Infection On Succulents

Homemade fungicide for succulents

Baking SodaI, Dishwashing Soap,Cooking Oils and Pyrethrin leaves are some fungicides which you could use at home to treat fungi attacks. 

If you are someone who is more eco friendly and someone who wants to get your task done with a little amount of money, you may go ahead creating  fungicides on your own for your succulent. 

You simply have to use some household products and create your own fungicides.

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This is a list of things which you would need to make a fungicide.

Baking Soda – You could mix the four teaspoons or either 01 heaping tablespoon of baking soda along with one gallon of water.

Dishwashing Soap – If you have a dishwashing soap which does not contain greaser or bleach , you could use it as a fungicide for the infected succulents. This is a famous homemade plant fungicide.

Cooking Oils – you could blend cooking oils into homemade plant fungicides. It will make them cling to the leaves as well as to the stems.

Pyrethrin leaves – someone could use the flowers from the painted daisies as a fungicide too. This is a common fungicide among the succulent growers. 

You have to first of all, wither the flower heads. Afterwards, you may either grind them or soak them overnight in 1/8 cup of alcohol. 

Next step would be to mix it with water. You may use four gallon of water for this. Finally, let it strain through cheesecloth.

How to get rid of cactus fungus?

The most crucial thing when you need to get rid of  fungal infections on the cactus is early detection of it.

Regular inspections on the succulents would be very useful when it comes to this point, because when you keep your plant under observation daily, you could rectify whenever there is an issue.

We could bring the succulent back to its survival mode if it has got a  soft rot. If you are lucky enough to recognize this fungus , try using a copper fungicide. Just simply spray it at the surface cuts or at the openings.

There could be some fungi such as anthracnose too. Then you need to trim the damaged areas to treat those. A copper fungicide could also be useful to stop this fungus getting spread.

Besides those, there could be some other fungus which you could successfully treat. Some examples for that are, dry rot, cotton root rot, sunscald etc.  you should completely take them off from the plant. 

Fungal Infection On Succulents 2 1

Why is my succulent soil molding?

If you spot any white mold developing on the surface of indoor grown potting mix, it would be a non poisonous saprophytic fungus.

Some stimulating factors for the development of saprophytic fungus are over watering the plant, not providing a well-draining soil mix, keeping it in the same old potting mix or giving  contaminant potting soil.

It generally survives on decaying organic substances in the soggy soil.

Does vinegar kill fungus on plants?

We could use vinegar to kill fungus on the plants. You could use Vinegar mixture to overcome most fungal infestations on any type of plant.

The specialty of it is it will not harm the plant. Further you could use  this spray to treat the black spots on roses or on aspen trees as well. They will help to get rid of them.

What are the black specks on my succulents? Are they fungus?

If you spot any succulent with black spots, that is literally due to a fungal infection. They could form on damaged plant tissues.

If you come across any, you simply have to take the plant out of the pot and re plant it. Don’t forget to check whether its roots are healthy though.

If the roots are healthy , you can cut off the affected leaves as well as the stems. Then , you may go ahead and repot the succulent in dry soil.

You should cut down on  watering and  do it as appropriate.

Credit to: Life.Greenery
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About author

I’m Dr. Chamika, As a hobby love talking about plants and showing you that taking care of indoor plants. My website is knowledge I’ve learned over the years and continue to learn about growing succulents. If you’re a succulent lover, then you have come to the correct place.

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