. 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. 378 ECONOMIC ENTOMOLOGY cheap hand-pumps are usually sufficient; but for orchards pressure- pumps, operated either by hand or by power, are essential. With or- chards over 5 or lo acres or with high trees power-pumps or sprays, capable of giving a high pressure of 150 to 200 lbs. are now generally used. An important feature of all spray pumps is the agitator for keeping the chemicals in the tank well stirred. Moreover,
. 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. 378 ECONOMIC ENTOMOLOGY cheap hand-pumps are usually sufficient; but for orchards pressure- pumps, operated either by hand or by power, are essential. With or- chards over 5 or lo acres or with high trees power-pumps or sprays, capable of giving a high pressure of 150 to 200 lbs. are now generally used. An important feature of all spray pumps is the agitator for keeping the chemicals in the tank well stirred. Moreover, it is very essential that the spraying be done thoroughly and at the proper time. Thoroughness of spraying, while largely a matter of personal atten- tion, is secured with greater convenience with a pump of high pressure and with suitable nozzles, extension rods and hose, so that every part of the plant, the tips of the twigs as well as the larger branches, is drenched. The proper time of application is determined by the habits of the insect, and herein hes the value of a knowledge of the life-history of the 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, 1864-1927. Philadelphia : Blakiston
Size: 1664px × 1502px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsects, bookyear1919
