How can I control the shelf conch fungus?
By the time conchs appear, little, if anything, can be done to control the growth of the fungus that produced them. Such fungi enter the heartwood, weakening branches and trunks. Infected trees may live for years, but in their weakened condition they often constitute a hazard. If a conch-bearing tree is valuable to you, ask an arborist or forester to evaluate its health and recommend a course of action.