The mold may cover an entire leaf surface or appear in spots, depending on the severity of the problem. These insects drain sap from magnolia plants and excrete a sticky-sweet liquid called honeydew. Droplets of honeydew are shed by these pests and fall onto surfaces below where they are feeding. It can be cured by attacking the scale insects and the disease itself. The first step is to eradicate the honeydew-making pests that caused the fungus in the first place. Sooty moulds are surface contaminants – they do not attack the plant directly. The sooty molds tend to interfere with the photosynthesis. *Sooty mold can affect non-plant items also. This disease is more prevalent in the warm humid conditions. Outdoor furniture, swing sets, grills and other items under insect affected trees can begin to grow a coating of sooty mold if they get covered with honeydew. Removing sooty mold from citrus trees involves the same general process as removing sooty mold from any other type of plant. The pathogens are dark fungi growing either on the "honeydew" excreted by sucking insects or on exuded sap material coming from leaves of certain trees. These sucking insects can include aphids and scale insects and sooty mold may occur on any tree but is most commonly seen on boxelder, elm, linden, and especially maple trees. Sooty mold forms a gray or black coating on leaves, tender stems or flowers. These pests secrete a sticky substance (called honeydew), on which a black-colored, velvety fungus grows. It is characterized by round waxy bumps that are brown in color and presence of small black insects. A severe enough sooty mold problem can cause general plant decline but rarely kills the plant. Black Sooty Mold: Though not a harmful disease, sooty mold is the fungal growth on the leaves and stems of magnolia trees that are infested with pests like scales and aphids. A dark, unattractive fungus called sooty mold forms on the honeydew deposits. aphids, mealybugs, scale insects, whiteflies). The mold does not spread without the honeydew to grow on, so new sooty mold indicates a continuing insect problem. The insect's voracious feeding and the accumulation of the black moldy mildew from the scales' secretions often kill the tree over time if … Other Diseases in Magnolia Trees. The sooty mold grows on the sticky residue that is produced by the scale insects. Although sooty mold doesn't penetrate the plant tissues, it can weaken it by blocking sunlight. They require a nutrient source on which to grow, and this is most commonly the honeydew excreted by a number of sap-sucking pests (e.g. Black, sooty mold and mildew appears on magnolia trees when the tree suffers a heavy infestation of magnolia scale insects (Neolecanium cornuparvum).

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