An ultra-low-volume liquid is a type of pesticide that is typically a very high concentration that is applied in very low amounts, usually in an aerosol form. The small droplet size means they can stay airborne for longer, maximising contact with airborne pests.
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All definitions are adaptations from Martin EA, Law J. Concise Medical Dictionary and Concise Colour Medical Dictionary. Oxford; New York, NY: Oxford University Press; 2020.