How Low Can They Go? Plant-Parasitic Nematode Distribution in a Washington Vineyard

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Figure 1
Aerial map of vineyard sampling area, with vineyard sampling locations indicated with white stars. Blocks sampled include Vitis vinifera cvs. Merlot, Cabernet Sauvignon, Syrah, and Malbec planted between 1990 and 2006.
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Figure 2
Soil sampling schematic for each vineyard location. Soil samples were deep-augured at 0.3, 0.9, or 1.5 m (1, 3, or 5 feet) from vines between each of two vine rows, for a total of five sampling positions. Each sample was divided into four depths of 30.5 cm (12 inches) each, to a total depth of 122 cm (48 inches) in the soil profile.
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Figure 3
Contour map of dagger nematode (Xiphinema spp.) soil population densities (number per 250 cm³ soil) by soil depth (30.5, 61, 91.5, or 122 cm below the soil surface) and position (0.3, 0.9, or 1.5 m from the vine row). Red indicates high population density and violet indicates low population density.
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Figure 4
Contour map of northern root-knot nematode (Meloidogyne hapla) soil population densities (number per 250 cm³ soil) by soil depth (30.5, 61, 91.5, or 122 cm below the soil surface) and position (0.3, 0.9, or 1.5 m from the vine row). Red indicates high population density and violet indicates low population density.

Vol 3 Issue Suppl 1