Deposition and drift of ulv and vlv insecticide sprays applied to cotton by hand applicator in northern nigeria

摘要

AbstractExperiments have been carried out in northern Nigeria to study the deposition and drift of the small spray droplets (70–130 μ v.m.d.), utilised in the application of carbaryl plus an indicating dye, to cotton, at very low volume rates (6–12 litre/ha) using water‐based formulations and at ultralow volume rates (3 litre/ha) using waterless formulations. The character of the deposition and extent of drift have been shown to relate to spray droplet size, formulation and a combination of meteorological factors. Practical recommendations have been evolved for very low volume and ultralow volume techniques in which the time of application is restricted to those periods of the day which favour high re