. Control of insects in stored and manufactured tobacco. Tobacco Diseases and pests Control; Tobacco Storage Diseases and injuries. 18 CIRCULAR 8 6 9, U. S. DEPARTMENT OF AGRICULTURE A power sprayer has been especially designed for use in tobacco warehouses. This machine has a blower that will deliver approxi- mately ^.400 cubic feet of air per minute at an initial velocity of about 5,700 feet per minute. Such a spray machine will blow finely atomized spray 100 feet or more, and reasonably good coverage can be obtained in open warehouses, even with a breeze of 6 to 7 miles an hour (fig. 11). T
. Control of insects in stored and manufactured tobacco. Tobacco Diseases and pests Control; Tobacco Storage Diseases and injuries. 18 CIRCULAR 8 6 9, U. S. DEPARTMENT OF AGRICULTURE A power sprayer has been especially designed for use in tobacco warehouses. This machine has a blower that will deliver approxi- mately ^.400 cubic feet of air per minute at an initial velocity of about 5,700 feet per minute. Such a spray machine will blow finely atomized spray 100 feet or more, and reasonably good coverage can be obtained in open warehouses, even with a breeze of 6 to 7 miles an hour (fig. 11). The spray should be a moderately fine mist. A spray that will hang in the air for not less than 5 minutes or more than 15 minutes is most Figure 11.—Applying pyrethrum-oil space spray in a warehouse containing flue- cured tobacco. Fire-insurance underwriters have approved the use of pyrethrum- oil spray in tobacco warehouses when prepared and used as directed. Although the flash point of the oil used in these sprays is approxi- mately 175° F., such oil is moderately flammable and might be ex- plosive under certain conditions. Only electric spray machines should be used. Sparkproof motors and switches and heavy-duty rubber- jacketed extension cord containing a grounding wire should be used on all sprayers. All precautions recommended by the interested fire insurance com- panies should be carefully followed. Closed-Type Warehouses The closed-type warehouse differs from the open-type in that it can be sealed for fumigation. Closed warehouses usually afford better. 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 Tenhet, Joseph N. (Joseph Nesbitt), b. 1897; Bare, Clarence O. (Clarence Owen), 1889-. Washington, D. C. : U. S. Dept. of Agriculture
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