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Title: Diplodia Tip Blight and Canker of Pines (Pest Alert)
Author: USDA Forest Service,;
Source: Pest Alert, unnumbered. Newtown Square, PA:U.S. Dept. of Agriculture, Forest Service, Northern Area State & Private Forestry
Publication Series: Program Aid
Description: The fungus Diplodia pinea can cause serious damage to Austrian, ponderosa, red, Scots, mugo, jack, and white pine. Although it is considered a weak pathogen, it may successfully attack and kill trees. It may be more serious on trees growing out of their natural range or stressed by adverse climatic conditions or air pollution. Infection can occur as a result of hail snow damage, insect wounds, and wounds caused by shearing Christmas trees. The most common symptom of this disease is stunting and subsequent browning of current year shoots and needles in May and June. Fully developed shoots may also be killed. Pockets of infected trees are typical in windbreaks. In more severe cases, pitchy cankers may form under the bark of twigs or the main stem, causing individual branches or the entire tree to turn brown and die. Small black fungus fruiting bodies may be found on branches, stems, needles, and cones.
Keywords: Tip mortality.
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USDA Forest Service 0. Diplodia Tip Blight and Canker of Pines (Pest Alert). Pest Alert, unnumbered. Newtown Square, PA:U.S. Dept. of Agriculture, Forest Service, Northern Area State & Private Forestry
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