Appearance. A common shrub disease, powdery mildew is a fungus that at first produces white spots on leaves. Plants That Are Most Susceptible to White Mold. Many people who check their hemlock trees may notice small, white spots that look a bit like hemlock woolly adelgid. Photo by Chris Evans, University of Illinois, Bugwood.org. One type of scale that attacks euonymus shrubs (especially Euonymus japonica) is the euonymus scale (Unaspis euonymi).This is an armored type of scale that comes in two colors: Males are white and females are brown. Holly (Ilex spp.) branches weave bright patterns of glossy green leaves and glowing red berries through holiday garlands. At the start, the white mold looks like powdery spots. I said, thank goodness the sky pencil holly is healthy, now guess what? As the spots spread, the leaves and stems become covered in a white, puffy substance that causes the leaves to turn yellow and fall off. White fungal infections can affect most plants; however, there are some types of trees, shrubs, and flowers that are more susceptible to powdery mildew. You identify white fungus on palm trees as those ‘white stuff on your palm tree.’ Primarily, the white fungus appears on palm trees as cotton-like soot. Both suck on plant tissue, which can cause damage. I have also seen quite a bit of this “problem” at the pollinator garden. The alga Trentepohlia is seen as a vivid orange powdery deposit on tree trunks and branches.. Lichens: Lichens growing on trees and shrubs are mainly grey to green in colour. To treat the symptoms, you must first identify the cause. Several people have asked me what is the white fluffy stuff they are seeing on the stems of shrubs. Hemlock woolly adelgid has only been found in a few locations in Michigan at this time. What Is the White Infestation on Green-Leaf Plants?. These whitish powdery substances usually appear first on the underside of the palm tree leaves and fronds and progress to … Algae: On tree trunks and leaves of evergreen trees and shrubs, algae can be seen as a green, powdery deposit. Green, leafy plants bring life and interest into both indoor and outdoor spaces but sometimes develop a confusing infestation of scary white stuff. It is not unattractive on trunks but can make leaves dull and unsightly. At first I thought they were mealybugs but upon closer inspection I discovered they were nymphs of the flatid planthopper . hi, I had a dwarf nandina plant, very bushy, that had little white spots on the branches. Hemlock woolly adelgid’s white “wool” egg sac. Scale (or armored scale) describes a common family of insects that feed on various shrubs and trees. White Mildew on Holly Bushes. Therefore, the trees are already in poor health and the slime flux is another issue that the tree has to deal with. 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