. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. 382 ECONOMIC ENTOMOLOGY average profit was $ These results are interesting as they were obtained from farmers under ordinary farm conditions. DUST SPRAYING During the last 6 or 7 years there has been a revival of dust spraying, especially in New York State. Professors Reddick and. Fig. 249.—A dust sprayer in operation in an orchard. (Courtesy of the Niagara Sprayer Co.) Crosby of Cornell University carried out a s
. Class book of economic entomology, with special reference to the economic insects of the northern United States and Canada. Beneficial insects; Insect pests; Insects; Insects. 382 ECONOMIC ENTOMOLOGY average profit was $ These results are interesting as they were obtained from farmers under ordinary farm conditions. DUST SPRAYING During the last 6 or 7 years there has been a revival of dust spraying, especially in New York State. Professors Reddick and. Fig. 249.—A dust sprayer in operation in an orchard. (Courtesy of the Niagara Sprayer Co.) Crosby of Cornell University carried out a series of experiments from 1911 to 1917 with dust sprays against insects and fungous diseases of the orchard. Different mixtures were used: 1. Sulphur, 80 per cent.; arsenate of lead, 20 per cent. 2. Sulphur, 40 per cent.; arsenate of lead, 10 per cent.; finely ground gypsum, 50 per 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 Lochhead, William, 1864-. Philadelphia, Blakiston
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
