. Bulletin of the Department of Agriculture. Agriculture. THE TOBACCO BEETLE. 51 be easily destroyed at such times by brushing them down into pans of Avater or oil, or onto sheets of sticky fly paper. In a tobacco ware- house visited by the writer the owners make it part of the regular duties of the watchman to visit each window in the building where the beetles collect and sweep them down on sheets of fly paper spread out on the window sills. Immense numbers of the beetles are de- stroyed in this way at very little cost. COLLECTING BEETLES BY SUCTION. The use of suction fans operated at
. Bulletin of the Department of Agriculture. Agriculture. THE TOBACCO BEETLE. 51 be easily destroyed at such times by brushing them down into pans of Avater or oil, or onto sheets of sticky fly paper. In a tobacco ware- house visited by the writer the owners make it part of the regular duties of the watchman to visit each window in the building where the beetles collect and sweep them down on sheets of fly paper spread out on the window sills. Immense numbers of the beetles are de- stroyed in this way at very little cost. COLLECTING BEETLES BY SUCTION. The use of suction fans operated at lights for collecting the beetles in warehouses has been reported. There has been no opportunity to. Fig. 14.—Suction fan used for collecting adults of the tobacco beetle in a tobacco ware- house. test this method. The use of vacuum cleaners operated by electric current might possibly prove to be an effective method of collect- ing beetles at the windows of warehouses. At Lancaster, Pa., a suc- tion fan was used in one of the large tobacco warehouses. Beetles could be readily drawn from cracks in the building and from about windows, and large numbers were said to have been collected in a short time on several occasions. A photograph of the apparatus used is shown in figure 14. OTHER REMEDIES. EXPOSURE TO VACUUM. In 1012, a series of experiments were made at Clarksville, Tenn., by Mr. A. C. Morgan and the writer to ascertain the effect of treating infested tobacco in vacuum. With the apparatus used, a vacuum of about inches could be readily obtained. When the air in the vacuum chamber was exhausted the beetles became inactive, but after exposures varying from 1 to 24 hours they again became active when normal air pressure was restored. In some of the experiments a few adults were killed. The eggs hatched normally after exposure. While the experiments with vacuum apparatus alone from a practical. Please note that these images are extracted from scanned page images that may
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