Mode of infection and early colonization of slash pine pinus elliottii var elliottii seedlings by cronartium quercuum f sp fusiforme

Miller, T.; Patton, R.F.; Powers, H.R.Jr

Phytopathology 70(12): 1206-1208


ISSN/ISBN: 0031-949X
Accession: 005908444

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After artificial inoculation of slash pine seedlings with basidiospores of C. quercuum f. sp. fusiforme, the fungus produced an infection peg which penetrated through the cuticle and cell walls of the epidermal cells of hypocotyls, cotyledons, stems, and primary and secondary needles. In some instances an appressorium was formed. Within infected cells, the fungus developed a vesicle-like structure, or an irregularly oblong primary hypha usually single-celled, but occasionally several-septate. From these structures, a hypha penetrated the cell wall and developed a largely intercellular mycelium, from which typical haustoria were produced in some cells.