Pests. Pests and diseases strike large collections of succulent plants in greenhouses and small windowsill collections indiscriminately, irrespective of the experience of the grower. Common Pests and Diseases. The most common threat to sedum is excessive moisture. Hardy, Tough and Disease Resistant Hens and Chickens. Extended rains or overwatering can lead to an accumulation of moisture, causing rot, mold, or fungus. Fortunately, they are relatively easy to control and prevent. One of the great things about growing succulent plants is the lack of pests they attract. If disease has moved into leaf or stem parts, control may also be achieved with the use of fungicides applied as soon as symptoms are visible. But every once in a while, these stars of the shade can still run into a few problems — even with perfect growing conditions. Give these hardy succulents the right conditions, and they will seldom have trouble with pests or insects. Disease is favored by cool wet conditions and the presence of overripe fruit or old flower petals. But unfortunately succulents do develop issues from time to time and we need to be equipped to get them through the tough times as quickly as possible. Sanitation is the most important means of control. Remove dead flowers before gray mold develops. Posted by @goldfinch4 on March 10, 2013. If overwatered or overcrowded, Sedums may be subject to infestation by scale insects and mealybugs. However, a few precautions can reduce the frequency with which the problem occurs. It is important to keep an eye out for small gnats, aphids, and mealybugs, as these are the most common succulent/cactus plant pests. Not many plants are as resilient as these guys, yet even they face some dangers. Sedum is one of the most disease resistant, easy to grow plants on the market today. You can dispose of them by spraying insecticidal soap or neem oil over the foliage. Hostas definitely make the list of easy-care perennials, and they make a great addition to almost any garden. A thread in the Garden Pests and Diseases forum, titled Something's killing my sedum Boasting succulent-like leaves and large flowers, most insects don’t bother sedum. Pests and Diseases of Sedum. Watch for aphids and flies. Catch these hosta troubles early, though, and you won’t have as much damage to deal with. Common Pests & Diseases Treatment for Succulents No one wants to witness their beloved succulents deal with annoying pests or fungal diseases. Sedum is generally resistant to pests, though mealybugs, snails, slugs, and scale insects may take interest in the plant. Sedums rarely show signs of pests and diseases, but they are not completely immune. Identifying hosta problems. As a rule, sempervivums are tough little plants that can put up with a lot of abuse before they’re overwhelmed. Snails and slugs may also be problematic outdoors. 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