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Multidimensional scaling (MDS, stress = 0.14) plots of all samples based on latitude and density of Helicotylenchus spp. (A), and crop cultivation method (B). Nematode density levels (expressed as adult and juvenile nematodes × 100 cc soil−1) are: L = low or absent (0–290), M = medium (291–804), H = high (805–1,319), VH = very high (> 1,319) (mean density and standard deviation (SD) = 290 ± 514 nematodes × 100 cc soil−1).
