INFLUENCE OF STEM NEMATODE INFESTATION ON BACTERIAL WILT REACTION AND FORAGE YIELD OF ALFALFA VARIETIES

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Abstract
Four varieties of alfalfa (Medicago sativa L.) were tested in field plots for their reactions to single and dual inoculations with the stem and bulb nematode Ditylenchus dipsaci (Kühn) Filipjev and the alfalfa wilt bacterium Corynebacterium insidiosum (McCull.) Jensen. Grimm was highly susceptible to both pathogens. Vernal maintained high resistance to C. insidiosum despite moderate nematode infestation. Lahontan remained highly resistant to both pathogens. Beaver lost much of its inherent resistance to the wilt bacterium when infested by D. dipsaci.Six varieties, including the four above, were grown in a forage-yield test in which nematode-inoculated and uninoculated plots were harvested in three successive seasons. The nematode-susceptible varieties showed marked reduction in forage yield during the second and third harvest years. Vernal, with partial nematode resistance, was less severely affected. The resistant varieties, Talent and Lahontan, showed no yield reduction.

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