Control de Mesocriconema xenoplax, Xiphinema index y Xiphinema americanum s.l. Variando la concentracion de cadusafos, y efecto en rendimiento de uva de mesa var. Red Globe durante 4 años de aplicaciones

Cadusafos was evaluated at different concentrations of application over 4 seasons between the years 2005 and 2009, to determine an optimal concentration and to relate nematicidal control with yield of table grapes var. Red Globe. The study was done in Los Andes, Fifth Region, Chile, on non-grafted plants. Cadusafos was applied at 80, 200, 400 and 800 ppm of active ingredient, in doses of 2, 3 and 6 l/ha of a.i., plus one control treatment. Ethoprophos and carbofuran were used as chemical controls. Applications were made through drip irrigation system, in the phenological stages of pre-bloom, bloom and fruit set. Applications at 400 ppm a.i. were better than 200, 80 and 800 ppm a.i., concentrations without nematicidal effect. In the four seasons, reduction of nematicidal action of cadusafos was observed on Mesocriconema xenoplax, applied at 400 ppm a.i. In the fourth and last season cadusafos did not control M. xenoplax. Bloom, set fruit and postharvest applications were equal in population reduction of M. xenoplax. Control of M. xenoplax also was observed in postharvest sampling, suggesting persistence of nematicidal effect of cadusafos until 140-182 days. Population levels of Xiphinema index and X. americanum s.l. were low during the experiments. Cadusafos improved yields, but in the third and fourth season yields were lower than in the previous seasons. Management advantages of nematicide concentration in technical irrigation systems are discussed.