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This study was undertaken to determine whether pesticide spray volumes on avocados could be substantially lowered with the use of a superspreader adjuvant, and to identify an optimum spray volume and adjuvant rate to maximize spray retention. Ground-based air blast applications of copper fungicide were made to 4-5 year old fruit- bearing trees. Spray retention was quantified on foliage and fruit, at a range of canopy heights and positions. Spray deposits on foliage were maintained or improved using reduced volume sprays (500-700 litres/ha) incorporating the superspreader Du-Wett, compared to the standard high volume treatment (2500 litres/ha). The adjuvant maintained total spray deposits on fruit using 3-5 times less spray volume than is current standard practice. There was no evidence of phytotoxicity on any fruit or foliage due to adjuvant sprays. The study highlighted deficiencies in current spray application technology used on avocados.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

Use of a superspreader adjuvant to reduce spray application volumes on avocados