That is because this easily removable substance grows on the sweet, sticky substance that is excreted by sap-sucking insects. Nikki Walters has been a journalist since 2008. Succulent Sponsor. 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. Cut off the infected leaves of the plant and sterilize the scissors with alcohol when you're finished so you don't transfer the disease on other plants. It is also more likely to infect succulents growing in excessively wet soil conditions. Wipe the black mold off and control the insects using an insecticidal soap or horticultural oil. This type of fungal infection is also called Black Mold. It's practically drowning. Mealybugs, spider mites and aphids feed on succulent leaves, leaving little areas of dead tissue that then grow sooty black mold. These spores disperse by wind and splashing water. Solution: Cut and throw away any infected leaves. Black spots are a type of fungus which has formed in the damaged tissues in the plant. Mealybugs, mites and aphids feed on succulent leaves, leaving small patches of dead tissue that eventually form sooty black mold. You can start watering it after two or three days but with less or less frequency than you did before. Was this article useful in helping you diagnose your succulent leaves troubles? The fungus does not harm or feed off the plants, but instead gets its nourishment from honeydew. Sooty mold forms a gray or black coating on leaves, tender stems or flowers. We use cookies to ensure that we give you the best experience on our website. For the remaining healthy parts of the plant, you can take some cuttings. A large group of fungi from the Colletotrichum family, anthracnose most frequently occurs on succulent plants that are grown in insufficient light, overwatered or watered using overhead irrigation. Listen to this blog post! This infection is caused by the presence of mealybugs, aphids, whiteflies, and scale. The leaves were mushy and rotting from mold. Black or sooty mold is a fungal infection often seen on plants that are also infected with pests such as whitefly or mealybugs. Examine the stem for any black/blue spots. Identify the succulent fungal disease by the brown lesions on the leaves or crown. Prior to a winter storm that might bring hail, move vulnerable potted plants beneath an overhang. If the roots are soft, it means they are dead and the plant is a goner. … Some succulents are more prone to black/brown puncture marks and scratches than others. You should allow your succulent a few days to adapt to the full sun, so on the first day place it in the sun for three or four hours in the morning, and increase the time of sun exposure by one hour a day. If this is what you’re seeing you don’t have anything to worry about. Insects are attracted to weak plants, so ensure the succulent is grown using proper growing methods. Walters received a B.S. Not surprisingly, soft-leaved and thin-skinned succulents are especially susceptible. Sure, while such succulents like the sun, they may be damaged or adversely affected by excessive sunlight. Remove the leaves that are sunburned, since they won't regenerate, and place the plant in the shade. This results in a heavy coat of black mold that may build up on needles and twigs. Mealybugs, mites and aphids feed on succulent leaves, leaving small patches of dead tissue that eventually form sooty black mold. She is also a Florida master gardener. So what's causing your succulent leaves to turn black? If you touch your succulents leaves and they are soft, that means the plant has received too much water. Mites, aphids, mealy bugs and scale all excrete the sticky substance known as honeydew. Remove infected plant areas, avoid overhead watering and prevent further spreading by applying a Bordeaux mix, a mixture of hydrated lime, sulfur and copper. Caused by the bacterium Sphaerotheca, powdery mildew affects almost every type of herbaceous plant, as well as shrubs and trees. But if the roots have rotted, turned black, or have dried up and turned brown, chances are slimmer that you can save your plant. This can happen if something falls on the succulents, when the foliage is damaged while re-potting or through hail damage. You will never see an Aloe Mite crawling around on your Aloes, but you can definitely see the damage that it leaves behind. © 2020 Succulent Alley. There may be an active pink, red or orange spore pad in the lesions. 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. 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. It’s also among the least damaging fungi on succulents. Once a succulent leaf is damaged or scarred, the only way to hide the spot is to remove the leaves with spots. Pock-marked and pitted leaves of succulents often result from impact damage. Bring the plant indoors at night, or place it in the shade. Wipe the leaves with alcohol-soaked cotton balls, or use a potassium soap or insecticide to kill the bugs. in journalism from the University of Central Florida and is a graduate of the New York Institute of Photography. Mites, aphids, mealy bugs and scale all excrete the sticky substance known as honeydew. 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. Black spots are generally caused by over-watering, sunburn, or sometimes bugs. The spots won’t go away. Overwatering of succulents mixed with cool weather, or planting the succulent in the soil too deeply, provides a prime breeding ground for stem rot-causing fungi. But make sure that the plant can still be revived. To kill the bugs, wipe the leaves with cotton balls dipped in rubbing alcohol, or use insecticidal soap. Black sooty mold that grows on the leaves and stems of succulents is indicative of an insect problem. 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. The stems are also mushy. If you have any other succulent troubles, do check out our articles and guides below. Proper growing practices keep succulent fungal diseases away. 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