. Concentrate spraying in deciduous orchards. Apples; Spraying and dusting in agriculture; Pulvérisation et poudrage en agriculture; Pulvérisation. 37 by Messrs. D. B. Waddell and J. M. McArthur. It consists in operating sprayers past a frame 30 feet high and 30 feet wide, to the face of which are attached small targets. The targets are mounted in pairs; one of each pair is a glass microscope slide coated with a silicone preparation; the other, a white card treated with a benzene solution of a high melting point wax (Fig. 10). The slides and cards are so treated as to minimize the spreading of
. Concentrate spraying in deciduous orchards. Apples; Spraying and dusting in agriculture; Pulvérisation et poudrage en agriculture; Pulvérisation. 37 by Messrs. D. B. Waddell and J. M. McArthur. It consists in operating sprayers past a frame 30 feet high and 30 feet wide, to the face of which are attached small targets. The targets are mounted in pairs; one of each pair is a glass microscope slide coated with a silicone preparation; the other, a white card treated with a benzene solution of a high melting point wax (Fig. 10). The slides and cards are so treated as to minimize the spreading of spray droplets and the penetration of the spray liquid. Equidistant from one another, at the five-foot level, are six pairs of such targets; six more pairs are directly above them at the 10-foot level, and so on at five-foot intervals to the 25-foot level. Thus, on the face of the frame are 30 pairs of targets. Charged with a water- solution of the dye Rhodamine B, at known concentration, the sprayers are driven past the spray frame at an angle of about 30 degrees, the first vertical row of targets being sprayed when the machine is 15 feet from the frame, and the last vertical row when the machine is five feet away (Fig. 11).. Figure 11—Spray-frame used in assessing orchard sprayers at the Entomology Laboratory, Summerland. As soon as a trial run is completed the sprayed slides and cards are removed to numbered holders, and replaced by fresh slides and cards. A statistical analysis showed that reproducible results necessitate three runs for each experimental machine or device. Since each assessment involves compari- son with a reference machine, six sets of 30 pairs of targets are Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Canada. Dept. of Agriculture. Entomology Research Institute; Mars
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