Nematicidal Efficacy of Fluensulfone against False Root-knot Nematode (Nacobbus aberrans) in Cucumber Crop under Field Conditions
José Alonso Calvo-Araya *
Escuela de Ciencias Agrarias, Universidad Nacional de Costa Rica, Apartado 86-3000, Heredia, Costa Rica
Martha Orozco-Aceves
Instituto Regional de Estudios en Sustancias Tóxicas, Universidad Nacional de Costa Rica, Apartado 86-3000, Heredia, Costa Rica
*Author to whom correspondence should be addressed.
Abstract
The present study was carried out to compare the efficacy of a nematicide of new generation for the control of the false root-knot nematode; Nacobbus aberrans, in cucumber crop (Cucumis sativus L.) under field conditions. The experiment was set up under a randomized complete block design with four replications. Six treatments were assessed for control of N. aberrans: four doses of fluensulfone, one of the nematicide oxamyl and a control with no application of nematicides. Ten days before transplanting, nematicides were applied in a single application via irrigation systems. Higher control under field conditions was obtained with the application of fluensulfone at a dose of 2.75 L.ha-1. The lowest final population densities of N. aberrans in cucumber crop were recorded in the plots treated with fluensulfone at the dose of 2.25 L.ha-1, with an average of 6.25 juveniles, and the lowest galling index was observed in plots treated with fluensulfone at the same dose, with a galling index of 2.1. The results indicated that application of fluensulfone to cucumber crop can provide good control of N. aberrans.
Keywords: Cucumber, efficacy, fluensulfone, nematicide, oxamyl