Anatomy of fusiform rust galls on loblolly pine

Jackson, L.W.R.; Parker,

Phytopathology 48(11): 637-640


ISSN/ISBN: 0031-949X
Accession: 030075407

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During the last 2 decades the incidence of fusiform gall rust (Cronartium fusiforme) has increased on slash pine, Pinus elliottii. and loblolly pine, P. taeda, in the southern United States. The fungus produces spindle-shaped galls on branch or stem of loblolly pine. Hyphae are large in diameter, septate, and uninucleate. In young shoots, they spread freely through the intercellular spaces of the cortex. In older twigs, they advance radially between the phloem ray cells, then through the cambium and into the wood rays. The haustoria, which become constricted as they pass through the cell walls, are allantoid, unbranched, and uninucleate. They invade the cells in the cortex, phloem and wood rays and epithelial cells in the resin ducts. The infection greatly increases the size and number of cells in the wood rays. The galls afford an ideal habitat for the breeding of a chalcid wasp.