Two hydraulic spray nozzle systems, a flat fan and a high-pressure hollow cone, were used forultra-low-volume application of the mosquito adulticide fenthion under a multiple swath scheme. Eight swathsat 322-m intervals were applied from a height of 91 m to simulate operational conditions. Deposition, effectson nontarget organisms (fiddler crabs), aerial flux, and mosquito (Ochlerotatus taeniorhynchus) mortality weremonitored for 8,230 m downwind, including...