Oxamyl sprays for the control of potato spraing disease caused by nematode-transmitted tobacco rattle virus

Field trials on sites infested with trichodorid nematodes in Scotland tested the effects of dichloropropene-dichloropropane mixture (D-D), thiofanox, and granules and foliar sprays of oxamyl on the incidence of spraing disease in potato (cv. Pentland Dell) tubers. D-D was effective in controlling spraing on all three sites, thiofanox was ineffective on the one site tested. On two sites oxamyl granules and sprays, alone and together, significantly decreased the amount of spraing. Those treatments including a spray were more effective than granules alone. At the third site different rates and times of application of sprays were tested.