Abstract
The degradation of diazinon residues in the soil of an orchard on the Waimea Plains, Nelson was determined. The half life of diazinon varied significantly between 12.2 and 27.7 days, depending on the time of application. Soil applications of diazinon had a significant effect on the emergence of adult apple leafcurling midge (ALM) (Dasineura mali Diptera: Cecidomyiidae). More ALM were captured in the control and plots treated with diazinon on 7 September than in plots treated with diazinon on 21 September and 5 October.
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