Abstract
An apparatus was designed and built to deliver micronized dust particles to the foliage of mature orchard trees under a mobile canopy. The dust is propelled by compressed air (about 1120 kPa), which is pulsed through sand-blast guns using the Bernoulli effect. The canopy consists of steel pipes that support the cover and serve as a conduit for compressed air that flows to the guns. Quick-coupling fittings on the canopy pipes allow for easy attachment and removal of multiple guns at various, optional positions. The support structure for the canopy is attached to a mobile trailer, which transports it over mature orchard trees while the dust is being applied. The canopy reduces drift and enhances the coverage of dusts while they are being applied. This innovative apparatus can be used to apply pesticides, growth promoters and regulators, fertilizers, and biocontrol agents in powdered form. The distribution of corn starch on apple foliage is assessed using this invention.
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