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Response of Resistant and Susceptible Alfalfa Cultivars to Regional Isolates of Stem Nematode¹

Nine stem nematode [Ditylenchus dipsaci (Kühn) Filipjev] isolates were collected from different nematodeinfested regions of the United States and Canada. They were tested for variations in pathogenicity at 15, 20, and 25 C on ‘Ranger’ and ‘Moapa’ (susceptible and ‘Lahontan’ and ‘Caliverde 65’ (resistant) alfalfa (Medicago sativa L.) to determine if variations in plant responses to different nematode isolates should be considered when breeding for resistance to stem nematode. All isolates were generally capable of parasitizing alfalfa; however, a difference in virulence was detected among isolates. Isolates did not demonstrate an interaction with temperature or with alfalfa cultivars. We concluded that a resistant alfalfa developed in a breeding program using one pathogenic isolate would probably be resistant to stem nematode isolates from other regions.

Key Words: Medicago sativa L. • Ditylenchus dipsaci (Kühn) Filipjev • Breeding

² Research agronomist, Field Crops Laboratory, Plant Genetics & Germplasm Inst., ARS, USDA, Agric. Res. Ctr. (West), Beltsville, MD 20705 (formerly, Irrigated Agric. Res. and Ext. Ctr., Prosser, Wash.); associate agronomist, and hematologist, IAREC, Washington State Univ., Prosser, WA 99350.

Received for publication April 2, 1977.