RESOURCES: Quick, Call a Tree Surgeon

Science  30 Jul 2004:
Vol. 305, Issue 5684, pp. 585
DOI: 10.1126/science.305.5684.585d

The blackened leaves of a rhododendron are telltale signs of an infestation by Phytophthora ramorum, a funguslike pathogen that causes sudden oak death. The disease, which attacks many plants besides oaks, began laying waste to California forests in the mid-1990s and has now spread to at least 21 states. To uncover more about maladies that assail trees, flip open this Web text from plant pathologist James Worrall of the U.S. Forest Service. Forest and Shade Tree Pathology starts with general backgrounders on rusts, cankers, wilts, and other types of plant ailments. Other sections cover the causes, symptoms, and control methods for specific diseases such as sudden oak death, which appears to have traveled from state to state in nursery plants (Science, 26 March, p. 1959). Readers can add their opinions on tree sicknesses to the site's “Log Blog.”

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