Parasite interaction with sporulation by cronartium quercuum f sp fusiforme on loblolly pine pinus taeda and slash pine pinus elliottii var elliottii

Kuhlman, E.G.

Phytopathology 71(3): 348-350


ISSN/ISBN: 0031-949X
Accession: 006062157

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Scytalidium uredinicola was the most common parasite of the aecial stage of C. quercuum f. sp. fusiforme in 3 pine plantations during 4 seasons. This mycoparasite was more frequently associated with aeciospores of the rust on loblolly pine in 2 North Carolina [USA] plantations than on slash pine in a South Carolina plantation. Tuberculina maxima was present on galls on loblolly pine during both aecial and spermatial sporulation, but it was not present on galls on slash pine. In the spring, T. maxima occurred several weeks before aecia appeared and remained independent of the rust aecia. Galls parasitized by T. maxima one spring less commonly had aecia the following spring than did galls without T. maxima. Parasitism by T. maxima was less frequent in the fall and had no effect on aecial sporulation the following spring. Galls with aecia alone, aecia with S. uredinicola, or neither of these were most likely to have the same sporulation type the following spring. Adult Epuraea lengi, a nitidulidid beetle, commonly fed on both aecial and spermatial tissue. Larvae of E. lengi fed on aeciospores and larvae of an unidentified diptera fed on spermatia.