Abstract
A scanning electron microscope procedure was used to determine which spray particle sizes deposit effectively on immatures of Trialeurodes vaporariorum (Westwood) following ULV applications by 2 different application techniques. Spray application techniques which maximize use of machine airblast to create air circulation within the foliage caused deposit of larger spray particles (i.e., allowed a larger portion of the spray particle size output to deposit successfully) on the immature stages. An optimum spray particle size of 15–25 µm (mass median diam) is supported for ULV applications in greenhouse floriculture.
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