Symptomless Resistance of Alfalfa to Meloidogyne incognita acrita
AbstractPenetration, development and migration of the cotton root-knot nematode, Meloidogyne incognita acrita, in resistant and susceptible alfalfa varieties was compared. Larvae entered both resistant and susceptible plants in approximately the same numbers. After 3 to 4 days, the number of larvae in resistant roots decreased sharply until at 7 days fewer than 5 larvae/seedling and no nematode development could be found. In susceptible roots, larvae became sedentary and developed normally; egg production began as early as 18 days after penetration of the host. Key Words: Meloidogyne incognita acrita, Medicago sativa, Alfalfa, Resistance. Susceptibility, Larva migration.
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