Efficacy of Selected Fumigant and Nonfumigant Nematicides to Control Meloidogyne javanica in Florida Tobacco

Four field trials were conducted over three years to compare the relative efficacy of nematicides, dosages, and application techniques for control of Meloidogyne javanica (Treub) Chitwood in flue cured tobacco (Nicotiana tabacum L.). Trials were conducted in a Klej fine sand naturally infested with M. javanica. Chemicals utilized were 1,2-dichloropropane-1,3-dichloropropene (DD), ethylene dibromide (EDB), ethoprop, phenamiphos, fensulfothion, metalaxvl, aldicarb, and carbofuran. DD and EDB gave the best control of M. javanica and increased tobacco yield in most tests while carbofuran, metalaxyl, and aldicarb gave the poorest control. Effectiveness of ethoprop and phenamiphos varied among test years but was improved by utilizing high rates of these materials. The post-plant applications of ethoprop did not significantly increase tobacco yields when compared to similar preplant incorporated dosages. Melalaxyl alone or in combination with nematicides did not significantly increase nemat