Superimposed Shallow and Deep Soil Fumigation to Control Xiphinema americanum and Peach Rosette Mosaic Virus Reinfection in a Concord Vineyard. D. C. Ramsdell, Professor of Plant Pathology, Department of Botany and Plant Pathology, Michigan State University, East Lansing 48824. G. W. Bird, Professor of Nematology, Department of Entomology, J. M. Gillett, Research Technician, Department of Botany and Plant Pathology, and L. M. Rose, Research Technician, Department of Entomology, Michigan State University, East Lansing 48824. Plant Dis. 67:625-627. Accepted for publication 11 November 1982. Copyright 1983 American Phytopathological Society. DOI: 10.1094/PD-67-625.

Superimposed shallow plus deep fumigant applications 20 (8 in.) and 91 cm (36 in.) in vineyard soil from which vines uniformly infected by peach rosette mosaic (PRMV) had been removed the previous year reduced populations of Xiphinema americanum to zero or near zero in the top 1.8 m (6 ft) of soil for 6 yr. Deep and shallow superimposed treatments applied at high rates were Telone II, Terrocide 30D, Terrogel 67, and Vorlex. A lower rate of Vorlex (than the superimposed rate) applied shallow only failed to control X. americanum and reinfection in one of 40 vines by the sixth year after fumigation. Virus-free Vitis labrusca L. ‘Concord’ grapevines planted in the variously treated S plus D plots remained free of infection by PRMV for 6 yr, but in the control plot two of 16 vines became infected by the fifth season and three of 40 vines became infected by the sixth season.