First report of Elytroderma deformans infecting Coulter pine in California.

Vogler, D. R., and Pronos, J. 1984.

U.S.D.A., Forest Service, Pacific Southwest Region, San Francisco, CA 94111.

Plant Disease 68:918. (1984)


Abstract

In 1983 we found Elytroderma deformans (Weir) Dark. infecting six planted Pinus coulteri D. Don in the southern Sierra Nevada at the University of California's Whitaker Forest, Tulare County, 160 km east of the nearest native stand. The pines were 40-45 yr old, 38-66 cm in diameter at breast height, and 13-23 m tall. We identified the fungus by disease symptoms and by microscopic examination of hysterothecia on 1-yr-old needles. We observed witches' brooms, some larger than 1 m in diameter, in the trees' lower crowns and resinous necrotic lesions in the outer phloem of infected twigs. Nearby native P. ponderosa Laws. and planted P. jeffreyi Grev. & Balf. were also diseased and were likely sources of inoculum. In southern California, E. deformans infects P. jeffreyi where its range overlaps that of P. coulteri, but P. coulteri is not known to be infected in its native stands.


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