You have to get rid of both the dead mother plant and the soil where it was grown, as both are possibly contaminated with the fungi that caused the plant's rot. Step 1 – Wear Garden Gloves . Succulent Sponsor. But what causes succulents to get black spots? Cotton root rot can affect several types of succulents and is most prevalent in areas with hot summers, soils with a pH range of 7.0 to 8.5 and temperatures above 82 degrees Fahrenheit. Some succulents are more prone to black/brown puncture marks and scratches than others. Pock-marked and pitted leaves of succulents often result from impact damage. One of the main causes of this is too much water. If you have any other succulent troubles, do check out our articles and guides below. Identify the succulent fungal disease by the brown lesions on the leaves or crown. Walters received a B.S. It is also more likely to infect succulents growing in excessively wet soil conditions. Although it is not usually harmful to healthy succulents, black or sooty mold will most often attack weakened or damaged plants. When you buy a plant in partial shade in a nursery and, for example, put it on your sunny terrace, or bring an indoor succulent plant outdoors, it may cause the leaves to burn. Mites, aphids, mealy bugs and scale all excrete the sticky substance known as honeydew. Not surprisingly, soft-leaved and thin-skinned succulents are especially susceptible. If that's the case, cut off all infected leaves and stems and replant succulents on dry soil. Succulents are low-maintenance plants that have few disease problems, except for when they are grown under poor cultivation practices. Solution: Cut and throw away any infected leaves. Repeat treatment every day until the small bugs are gone. To kill the bugs, wipe the leaves with cotton balls dipped in rubbing alcohol, or use insecticidal soap. Let the ends recover before transplanting those cuttings into new containers. in journalism from the University of Central Florida and is a graduate of the New York Institute of Photography. The mold may cover an entire leaf surface or appear in spots, depending on the severity of the problem. This type of fungal infection is also called Black Mold. Mealybugs, spider mites and aphids feed on succulent leaves, leaving little areas of dead tissue that then grow sooty black mold. Nikki Walters has been a journalist since 2008. Sooty mold forms a gray or black coating on leaves, tender stems or flowers. Was this article useful in helping you diagnose your succulent leaves troubles? All rights reserved. Wipe the leaves with alcohol-soaked cotton balls, or use a potassium soap or insecticide to kill the bugs. Orthotospovirus, the same one that causes the tomato wilt, can also attack succulents. Although it is not usually harmful to healthy succulents, black or sooty mold will most often attack weakened or damaged plants. This can occur particularly when a shaded succulent plant gets too much intense light before it has time to acclimatize. Listen to this blog post! Although sooty mold can be wiped off easily with a wet cloth or rubbing alcohol, if left … Black sooty mold (Capnodium spp) is among the least damaging fungi on succulents. This infection is caused by the presence of mealybugs, aphids, whiteflies, and scale. Remove the leaves that are sunburned, since they won't regenerate, and place the plant in the shade. In this episode, you’ll learn what to do if your succulent has a black stem, and the steps you can take to save it. Proper growing practices keep succulent fungal diseases away. Don't allow the succulent plant to sit in a tray of water. We use cookies to ensure that we give you the best experience on our website. If the black spots are underneath the leaves, it may be caused by a black ring virus. Once a succulent leaf is damaged or scarred, the only way to hide the spot is to remove the leaves with spots. That is because this easily removable substance grows on the sweet, sticky substance that is excreted by sap-sucking insects. She is also a Florida master gardener. As the infection spreads and gets worse, you may notice deflated, damaged or … 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 sooty mold that grows on the leaves and stems of succulents is indicative of an insect problem. You can remove the individual leaves, but it’s great that you’ve brought the plants inside. Repeat treatment every day until the small bugs are gone. Mildew likes a warm, wet environment, with little air circulation. Succulents retain excess water in their leaves, roots and stems so that they can withstand the drier conditions of their native desert, but too much water causes the leaf tissues to surpass their water storage ability and so they swell and burst. Solution: Remove the damaged leaves and throw them away. For the remaining healthy parts of the plant, you can take some cuttings.