. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. Fig. 1.—Hand Pump and Barrel on Sledge. (Original.). Fig. 2.—Knapsack Spraying Machine in Use in Hopyard. (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