Management of Meloidogyne javanica, M. arenaria, and M. incognita on Flue-Cured Tobacco with Organophosphate, Carbamate, and Avermectin Nematicides. D. Nordmeyer, Postdoctorate, Department of Entomology and Nematology, University of Florida, Gainesville 32611. D. W. Dickson, Professor, Department of Entomology and Nematology, University of Florida, Gainesville 32611. Plant Dis. 69:67-69. Accepted for publication 27 June 1984. Copyright 1985 The American Phytopathological Society. DOI: 10.1094/PD-69-67.

The differential sensitivity of Meloidogyne javanica, M. arenaria, or M. incognita to nonfumigant nematicides was evaluated on tobacco grown in microplots inoculated with 64 nematode eggs and/or infective second-stage juveniles per 100 cm³ of soil. Ethoprop, aldicarb, fenamiphos, oxamyl, and carbofuran applied at an overall rate of 6.7 kg a.i./ha, and avermectin B₁ at a rate of 0.17 kg a.i./ha increased yields of tobacco infected with M. incognita. Carbofuran did not increase yields of M. arenaria-infected plants. Neither carbofuran nor avermectin B₁ increased yields of M. javanica-infected plants. All nematicides except avermectin B₁ decreased the number of nematodes in the soil as well as the root-gall index at the end of the season. M. javanica and M. arenaria reproduced faster than M. incognita during the first part of the growing season.

Keyword(s): Nicotiana tabacum, root-knot nematodes.