Evaluation of fumigant and non-fumigant nematicides for the control of Meloidogyne chitwoodi on potato

Abstract

In two experiments conducted in Parma, Idaho, U.S.A. to study the efficacy of fumigant and non-fumigant nematicides on Meloidogyne chitwoodi infesting potato, there was a significant reduction in the number of root knot nematode infected tubers in treated plots compared to the untreated control. In the first experiment, maximum marketable yield and minimum percentage of nematode infected tubers were observed in a combined treatment of metam sodium (351 l/ha) with fosthiazate (5 kg/ha). Total tuber yield was significantly increased by application of metam sodium and fosthiazate, singly or in combination. The percentage of nematode infected tubers in treated plots ranged from 11.4-29.9%. In the second experiment, marketable yield was significantly increased by application of ethoprop or metam sodium or by two rates (140 and 187 l/ha) of 1,3-D compared to the untreated control. Total tuber yield was significantly increased by the application of the highest rate of 1,3-D and by metam sodium treatment. The percentage of nematode infected tubers in treated plots ranged from 18.7 to 28.0%, with the lowest number of parasitized tubers occurring in the 1,3-D (187 l/ha) treatment.