Effects of oxamyl and carbofuran on nematode populations below 10 grass cultivars

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Abstract
Ten grass cultivars sown in plots of Horotiu sandy loam were treated with oxamyl and carbofuran for insect control, and a year after sowing were sampled for soil nematodes. There were significantly (P6/m2 to 0.6 × 106/m2; below phalaris there was no reduction. Herbage production was increased (10–24%) in all cultivars except prairie grass. The nematode fauna in untreated plots contained less than 1% of any of the recognised plant pathogenic nematode genera. Glasshouse pot trials showed some significant responses to oxamyl and carbofuran, in sieved soil in the absence of insects and in sterilised soil. Field response to these insecticides in this trial may be due to insect control; there may be an element of plant response to the chemicals used, but nematode control is not a factor.

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