. Insect and disease conditions in the United States, 1979-83 : what else is growing in our forests?. Forest insects United States; Trees Diseases and pests United States; Plants Disease and pest resistance. Fusiform Rust Site-Specific Options Promise To Slow Epidemic Written by Robert L. Anderson his disease flourishes across JL the Southeast, killing or deforming millions of slash and loblolly pines each year. Annual losses may exceed $110 million (Powers and others 1975). Fusiform rust is caused by a fungus native to North America. The fungus infects loblolly and slash pines, the most susce
. Insect and disease conditions in the United States, 1979-83 : what else is growing in our forests?. Forest insects United States; Trees Diseases and pests United States; Plants Disease and pest resistance. Fusiform Rust Site-Specific Options Promise To Slow Epidemic Written by Robert L. Anderson his disease flourishes across JL the Southeast, killing or deforming millions of slash and loblolly pines each year. Annual losses may exceed $110 million (Powers and others 1975). Fusiform rust is caused by a fungus native to North America. The fungus infects loblolly and slash pines, the most susceptible southern pine species. Longleaf pine and pond pine are some- times infected, but not to the same degree as loblolly or slash pines. In contrast, spruce, sand, Virginia, and shortleaf pines are highly resistant to infection. Infections on pines start as slight swellings, which enlarge to form spindle-shaped swellings on the branches or main stem (fig. 1). The swellings on larger main stems may become cankers, areas of diseased tissue that encircle the stem. In the spring, orange-yellow blisters form on the swellings (fig. 2). These blisters release aeciospores, the spore stage of the fungus that infects the leaves of the alternate host, oak. About 10 days later, orange-colored uredia develop on the underside of the oak leaf (fig. 3). Later, brown, hairlike telia form on the leaf. The telia produce basidiospores, the spore stage that reinfects pine. Oak, the alternate host, is not severely damaged. Historical Perspective Before 1930, fusiform rust was a botanical curiosity rather than an agent causing economic losses. At that time, slash and loblolly pines grew naturally, and wild- fires kept the alternate host, oak, at relatively low F-701524. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lo
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