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White spots on the leaves of your shrubs are not caused by any one pest or disease; they can indicate a number of conditions. To treat the symptoms, you must first identify the cause. Green, leafy plants bring life and interest into both indoor and outdoor spaces but sometimes develop a confusing infestation of scary white stuff. I have also seen quite a bit of this “problem” at the pollinator garden. Many people who check their hemlock trees may notice small, white spots that look a bit like hemlock woolly adelgid. It began killing the plant so much that I had to chop it down and remove it. I said, thank goodness the sky pencil holly is healthy, now guess what? These whitish powdery substances usually appear first on the underside of the palm tree leaves and fronds and progress to … Plants That Are Most Susceptible to White Mold. branches weave bright patterns of glossy green leaves and glowing red berries through holiday garlands. 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. 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. Several people have asked me what is the white fluffy stuff they are seeing on the stems of shrubs. What Is the White Infestation on Green-Leaf Plants?. Photo by Chris Evans, University of Illinois, Bugwood.org. However, as the fungal growth spreads, the white stuff can cover the entire plant. Appearance. Both suck on plant tissue, which can cause damage. A common shrub disease, powdery mildew is a fungus that at first produces white spots on leaves. hi, I had a dwarf nandina plant, very bushy, that had little white spots on the branches. 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. It is not unattractive on trunks but can make leaves dull and unsightly. Hemlock woolly adelgid has only been found in a few locations in Michigan at this time. Hemlock woolly adelgid’s white “wool” egg sac. Algae: On tree trunks and leaves of evergreen trees and shrubs, algae can be seen as a green, powdery deposit. 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. White fungal infections can affect most plants; however, there are some types of trees, shrubs, and flowers that are more susceptible to powdery mildew. Holly (Ilex spp.) 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. Scale (or armored scale) describes a common family of insects that feed on various shrubs and trees. 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