Troubleshooting Tree Problems xviii
Symptoms
Possible disorder
Irregular spots, and dead areas on leaves that often follow the veins of the leaves.
Anthracnose
Defoliation of trees, holes in leaves and egg masses on tree trunks or any outdoor furniture
Spongy moth infestation
Dieback of leaves and twigs on major portions of a tree.
Blight
Infected wood often found on conifer that has a dry, burnt, cubical appearance.
Brownrot (Sometimes called Dryrot)
Defoliation of leaves. Tent-like web in tree.
Eastern Tent Caterpillar or Fall Webworm infestation
Localized dead tissue, often discolored, and shriveled.
Canker
Yellowing of green tissues because of a lack of chlorophyll.
Chlorosis
Rotting or decomposing wood tissue in the tree. Wood cells are breaking down in the tree. Swollen or irregular growth that may be induced by insects or other organisms. Oozing sap or gum from wounds or openings. Dead areas on the foliage, bigger than leaf spots and irregular in shape. Discolored spots of dead tissue on the foliage, usually on small areas of a leaf.
Decay
Gall
Gummosis Leaf blotch
Leaf spot
Dead tissue.
Necrosis
White or gray fungal growth on leaves or stems. Orange to red/brown pustules on leaves, or fruit.
Powdery mildew
Rust
Browning, dead areas around the margins of leaves or between leaf veins. Wood has a water-soaked or burnt look in areas that appear infected.
Leaf scorch
Soft Rot
Abnormally small growth on the tree.
Stunting
Darkening of the tree wood vascular areas, often along growth rings. Bleached appearance on wood, typically on broadleaf trees. May appear in a hollow in the tree.
Vascular discoloration
Whiterot
Drooping leaves or shoots.
Wilt
Abnormal development of multiple shoots.
Witch’s broom
42
Made with FlippingBook Online newsletter maker