It is not unattractive on trunks but can make leaves dull and unsightly. The lichens on trees are often gray-green. Hundreds of types of plants throughout North America are susceptible to powdery mildew, a fungal disease characterized by patches of white or gray powder on the leaves. Black Knot Fungus: What It Is and The Treatment That Gets Rid of It Those plant leaf spots are caused by one of nature’s most basic organisms: a fungus. Fungal leaf spot can be found in your outdoor garden as well as on your houseplant. Admiring the various spots, blemishes, and splotches on trees is a good winter time activity. 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. A good way to find an owl is to look for this clue. Lichens may be flat, leafy, or branched and hair-like. Specks on Trees. In addition to growing on the trunks and branches of trees, lichens can be found on exposed soil surfaces, rocks, wooden fence posts, shingles, gravestones, stone walls, and other sunny surfaces. Each year the white patches are worse and on my sugar maple the white patches have spread to the top of the tree and now tips of branches. Unlike the spots on the flowers or shrubs, these specks are not caused by the plant itself. Algae: On tree trunks and leaves of evergreen trees and shrubs, algae can be seen as a green, powdery deposit. Most leaf spot diseases affect only a small percentage of the tree's overall leaf area, and are a minor stress on the health of the tree. White specks on a hibiscus tree are an infection caused … The white spots might be lichen which can sometimes appear on ailing trees, but in and of itself does not damage the tree. Owl droppings can look a lot like pine sap dripping down the tree, but the droppings are always white and most resemble paint dripping down the tree. It is a white and hard growth in two different locations.” Find out which fruit trees get infected with this fungus and learn whether treatment or tree removal is the best option. Plants with Spotted Leaves. White bush fungus is a very descriptive term and a pretty good guess for what ails your hedge. I have at least 5 trees with white patches on the branches and trunk bark of the tree. Leaf spot diseases weaken trees and shrubs by interrupting photosynthesis. White specks on hibiscus trees often appear on the trunks and branches. They also have sections on their trunks where the tree has swollen too fast for bark to grow plus areas of black bark. Appearance. 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