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Greenhouse Screening of Alfalfa Cultivars for Resistance to Southern Root-Knot Nematode

Dep. of Agronomy
Dep. of Plant Pathology, Univ. of Georgia, Athens, GA 30602

^* Corresponding author.

Since alfalfa (Medicago sativa L.) is susceptible to southern rootknot nematode [Meloidogyne incognita (Kofoid & White) Chitwood], identification of resistant cultivars is necessary. In this study, the reliability of a greenhouse screening procedure using nematode eggs applied to individual seedlings was compared to the standard procedure of inoculating with juveniles. The level of root-knot resistance among 12 alfalfa cultivars was also determined using the egg method. The egg method gave more reliable information for galling and reproduction. Cultivars differed for percentage of resistant plants, but all had fewer galls than ‘Lahontan’ (susceptible check) and most were as resistant as ‘Moapa 69’ (resistant check).

Received for publication August 5, 1988.