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Abstract
Application of oxamyl and fenamiphos to grazed pasture significantly reduced nematode populations and gave increased herbage production, but both responses were soon masked by prolonged summer drought. Dominant genera were Paratylenchus, Doryllium, Dorylaimus, Aporcelaimus, and Tylenchus. Populations differed significantly with treatment, time, and depth (0-5, 5- 10, 10-20, 20-30 cm) but extremes of soil moisture masked the nematode: plant relationship. Generally, results from fortnightly sampling of 0-10 cm soil did not differ significantly from those sampled monthly. Generic population estimates in single cores were highly variable, but 10 bulked cores give reasonable estimates. Although 3-monthly sampling is generally sufficient at 10-30 cm, there are indications of seasonal changes at 20-30 cm which need study. Extraction by centrifugal flotation yielded, in some months, significantly more nematodes, apparently because of the recovery of dead but intact nematodes.