Abstract
Abstract Deposition of aerially applied herbicide spray was measured on leaves, soda (drinking) straws, and water-sensitive cards in the upper and lower parts of honey mesquite plants for spray mixture application rates of 18.7, 37.4, and 74.8 L/ha (2, 4, and 8 gal/ac) and droplet spectrums having 32525, 47525 and 62525 m Dv0.5 (volume median diameter). Disc and disc-core nozzles were used to produce the different droplet spectrums. Two types of tubular nozzles (10762 m inside dia tubes each), included in part of the experiments, produced Dv0.5 of 295 and 311 m at 18.7 L/ha and 330 and 352 m at 37.4 L/ha. Results generally indicated that herbicide active ingredient deposits were highest for the 18.7 L/ha mixture application rate, with some exceptions for which the 325 m Dv0.5 droplets and 74.8 L/ha mixture application rate resulted in higher deposits on plant leaves.
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