Apart from a few plants such as Sempervivums, succulents are not frost tolerant and so if you live in a country with cold winters that can see snow settle for several days, succulents may not survive outside even with a frost cloth over and should be brought inside until the danger of frosts passes. These are fungal infection, sunburn, pests, frost, and overwatering. Spots expend pretty quickly on leaves and crowns. And the worst part is, wet and dead plant material is the perfect breeding place for fungi. Even worse these products are very toxic to other useful insects and humans. Many succulents come from dry and arid environments and dislike humidity. You can remove the individual leaves, but it’s great that you’ve brought the plants inside. They are also masters at hiding and can position themselves in the tightest of spots between leaves and stem, in curled up, dried leaves, under the lip of the pot, under the table, under any debris found around their food source. Black spots on succulents are caused by over watering, sunburn, viruses, frost, trauma and pest infestation. Fungus infection, rot & warts from over-watering in succulents are quite common, especially in humid & warm parts of the world. Most fungicides can harm beneficial insects and so it is best to either spray in the evening when they are not active or make your own. Just like tiny pests can cause brown/ black spots by feeding from succulents leaves scratching the surface of the leaves can result in dark spots forming on the plants. Black spot disease is diagnosed when black or brown spots appear on leaves.. This Graptosedum is growing out of its mealy bug damage. The black marks in-between the leaves are where they fed. underwoodgardens.com. You don't have a fungal problem on your succulent. Roots can maintain a cool temperature when they’re in the ground than in pots. We have tried numerous pesticides claiming to control mealy bugs but they seldom work and they are also horribly toxic to other insects as well as yourselves. Frost is quite similar to sunburn in terms of symptoms. Cleanliness in your garden is one of the most important measures in preventing pests and diseases. Anthracnose is caused by fungi in the genus Colletotrichum. If the black spots are dry, it’s most likely caused by sunburn. Dark spots are often seen on the foliage when frost attacks. As you know, succulents are supposed to have a dry, gritty soil. Moreover, these things hide in the new leaves. Yes, unfortunately succulents can get sunburn. All the spots on this Echeveria are caused by a Fungus. For succulents to stand upright, they need plenty of water in the leaves. Lastly, remember to throw away both the mother plant and the soil it was planted in. The heavy potting mix tends to hold water, making the fungal infection worse. Fungus gnats are a really big problem on tropical plants because they thrive in that moist soil that tropical plants love. It is slowly growing out of its wounds. There are many pesticides in the market that claim to kill mealybugs. This will be an extra step in killing any remaining insects or eggs. We've always been cautious not to over water it so I don't think it could be that. Sometimes, if the plant is badly suffered, it can collapse on the ground. We hope this article helped to answer all of your questions regarding this matter. It’ll let you detect any early symptoms of pests and diseases. Plants in the garden do remarkably well and have much higher tolerance. Always use succulent potting mix or other well-draining mix in pot plants. Why are there black spots on my succulents? This way you’ll get to know if the new plant has any diseases regarding black spots. But how do you treat black fungus on a cactus? 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