A field trial to study the effects of soil fumigants on pure swards of 'Grasslands Huia' white clover growing in a yellow-grey earth infested with clover cyst nematode (Heterodera irijolii) , was run for 18 months. The treatments, replicated four times (24 plots, 2 x 1 m), were: control, methyl bromide, 'DD' soil fumigant at 300 l/ha, 'Nemagon' at 11.23 l/ha. 'Nemagon' at 22.46 l/ha, and 'Mocap' at 67 kg/ha. Twelve harvests were made during the trial and mean yield response to fumigation was 7.6% [-0.2% ('Nemagon' 22.46 I/ha) to 12.3% ('D.D.')]. However, during periods of activity of the clover cyst nematode yields were up to 46% higher in fumigated than in control plots. The effect was enhanced by moisture stress. Fumigation also extended the growing season into the summer drought.
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