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First Report of Arceuthobium hondurense in Mexico

April 2001 , Volume 85 , Number  4
Pages  444.1 - 444.1

R. Mathiasen , School of Forestry, Box 15018, Northern Arizona University, Flagstaff, 86011 ; D. Nickrent , Department of Plant Biology and Center for Systematic Biology, Southern Illinois University, Carbondale 62901 ; C. Parks , Pacific Northwest Research Station, USDA Forest Service, LaGrande, OR 97850 ; J. Beatty , Forest Insects and Diseases, USDA Forest Service, Sandy, OR 97055 ; and S. Sesnie , School of Forestry, Box 15018, Northern Arizona University, Flagstaff, AZ 86011

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Accepted for publication 25 January 2001.

Honduran dwarf mistletoe (Arceuthobium hondurense Hawksw. & Wiens) is a rare dwarf mistletoe previously known only from Honduras (1,2). In March 2000 we collected a dwarf mistletoe from approximately 7 km west of San Cristobal de las Casas, Chiapas, Mexico near Route 190 (elevation 2,440 m), which was morphologically similar to A. hondurense (1). This population had initially been classified as A. nigrumHawksw. & Wiens (1). However, our morphological measurements and analysis of nuclear rDNA ITS sequences of A. hondurense plants from Honduras (GenBank No. AF325969) and the plants from Chiapas (AF325970) have confirmed that the Chiapan population is A. hondurense and not A. nigrum. An additional population of A. hondurense was discovered in Chiapas approximately 11 km west of Oxchuc near Route 186 (elevation 2160 m). Both of the Chiapan populations of A. hondurense were parasitizing Pinus tecunumanii(Schw.) Eguiluz et Perry. Specimens of A. hondurense from Chiapas were deposited at the Deaver Herbarium, Northern Arizona University, Flagstaff. This is the first report of A. hondurense in Mexico and extends its known distribution from northwestern Honduras (3) by approximately 500 km. Although A. hondurense has not been observed in the pine forests of Guatemala, it is probable that it also occurs there (1).

References: (1) F. G. Hawksworth and D. Wiens. 1996. Dwarf Mistletoes: Biology, Pathology, and Systematics. USDA Agric. Handb. 709. (2) R. Mathiasen et al. Phytologia 36:211, 1998. (3) R. Mathiasen et al. Plant Dis. 84:372, 2000.

© 2001 The American Phytopathological Society