. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig. 1.—Compressed-Air Spraying Machine, Showing Air Bottle, Tank, Reducing Valve, and Pressure Gauge. (Original.). Fig. 2.—Filling Air Bottles for Compressed-Air Spraying Machine. (Original.) SPRAYING AGAINST THE HOP 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 United States. Bureau of Entomology. Washington : G. P. O.

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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectentomology