Influence of salt concentration on infectivity and development of Meloidogyne incognita on tomato

In greenhouse studiesl infectivity and development of M. incoynila on tomato was impaired by increasing soil solution concentrations (ECe 1.5, 2.5, 3.5, 5.0 mmhos/cm) ol NaC1, CaCI, or combinations of both salts. In two experiments, reduced inlrctivily was pronounced on a susceptible cultivar (Hunts) a t all salt concentrations, while infectivity was reduced primarily a t higher salt concentrations on a moderately resistant host (Beelmaster). Development of entrant juveniles was significantly depressed by both salts on cv. Hunts. hut merely delayed on cv. Beefmaster. Impaired infectivity and developmpnt resulted in population reduction to 2306 and 39% of controls on Reefmaster and Hunts, respectively, six u'rrks after infection.