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The Sensitivity of Larvae and Eggs of Meloidogyne Species To Hot-Water Treatments

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For more content, see Nematology.

Day-old larvae and mature egg masses of Meloidogyne arenaria, M. hapla, M. incognita incognita, M. incognita acrita, and M. javanica from Rutgers tomato were treated with water at 44°, 46°, 48°, or 50° C. The sensitivity of each species was determined by observation of the treated animals and regression analyses made on percentage larval kill. Less time was needed to kill all larvae of M. hapla than any of the other species at all temperatures. Longer exposures were necessary to kill all larvae of M. arenaria at 46°, 48°, and 50° C. Hatch of larvae from heated egg masses was compared with hatch from unheated egg masses 72 hrs after exposure in water to 46° C or 48° C. Greater numbers of larvae hatched from eggs exposed for 1 to 3 min. to 46° C than from unheated eggs. Egg masses of M. hapla were more sensitive than other species to 6 min. exposures at 46° C. No larvae hatched from any egg masses exposed to 48° C for 6 min.

Affiliations: 1: Department of Botany and Plant Pathology, Ohio Agricultural Experiment Station, Wooster, Ohio, U.S.A.


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