Abstract
The retention of organosilicone surfactant sprays (0-0.8% v/v) on wheat was determined, using a calibrated track sprayer, over a range of spray volumes representative of ground-based arable applications (37280 litres/ha). Volume of spray retained on foliage generally increased with carrier volume and surfactant concentration. Spray run-off was not evident with any treatment. The importance of the interaction between concentration of organosilicone and spray volume was highlighted. Spray was captured most efficiently at low spray volumes and 0.2% surfactant. It is expected that organosilicone surfactant addition to pesticide sprays on difficult-to-wet arable species would be beneficial over a wide range of application volumes.
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