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Abstract
In 1981–82, and 1982–83 trials were carried out on kiwifruit to examine the effectiveness of the controlled droplet application (CDA) spraying technique. Spraying was done at 60 and 50 litres/ha (total volume) over 2 full seasons using a rotating disc CDA sprayer developed at the NZAEI. A 1 year spraying programme involving the application of 200 litres/ha (total volume) of spray with a spinning cage CDA sprayer was also performed. Treatment included applications at half and three-quarters of the recommended chemical rate. The performance of these sprayers was compared with conventional high volume airblast and hydraulic units (2 250 litres/ha). Export spray programmes based on azinphos-methyl pre and post flowenng, followed by monthly applications of phosmet and/or diazinon, were used. Results were assessed on the basis of chemical residue analyses, and pest infestation on leaves, and fruit damage: All treatments at full chemical rate gave excellent control, and it is possible that chemical rates can be reduced.