Micro sprayers for the laboratory application of pesticides

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Abstract
SUMMARY: The microtip nozzle assembly described by Uk (1978) has been modified to provide a reliable and versatile sprayer for the laboratory application of pesticide formulations. The improved performance has been achieved through the introduction of knurled thimbles giving controlled adjustment of needle and stylus settings and by the provision of an offset liquid reservoir (0·1–2 ml) either pressurised or non‐pressurised.The device, which delivers monosize droplets (in‐flight diameter 50–500 μm) at velocities ranging from 0·5–20 m s‐1 has been used for aqueous and oil solutions, water dispersible powders and emulsifiable concentrates of varying concentration (0·1‐30g a.i. litre‐1) and is particularly suitable for the application of radiolabeled chemicals.