On the up-side, it does take a long time for an air plant to die. Ajuga Crown Rot; September 2, 1998: Ajuga crown rot is one of the few major disease problems on this host. If rot has set in, you can continue to enjoy it for a while longer. You’re Turn Tomatoes, peppers, eggplant, and other vegetable crops also can be affected. How to Treat and Prevent Phytophthora Disease Phytophthora root rot is a worldwide problem that can be treated but not completely eradicated. Crown rot is 100% preventable, and now you can keep it from endangering your plants. It is safe to know how to prevent these diseases and what first aid treatment or remedy you can best give your orchid plants once the plant is affected. Hosta Crown Rot. On the other hand, crown rot, as well as all infections, can be 100% prevented. Sites that are particularly wet or poorly drained will have this problem more than well-drained areas. How to Control Fusarium Root and Crown Rot. 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