. Control of insects attacking stored tobacco and tobacco products. Tobacco Storage Diseases and injuries. CONTROL OF INSECTS ATTACKING STORED TOBACCO 21 1. All electrical equipment of an electrically operated dusting machine, includ- ing motor, switches, and attachment plug, should be of the type approved for dust-laden atmospheres, and the frame of the dusting machine and discharge nozzle should be effectively grounded to prevent static electricity accumulation. Fan blades of the blower should be constructed of a nonferrous metal. 2. During dusting operations all electrical equipment other t
. Control of insects attacking stored tobacco and tobacco products. Tobacco Storage Diseases and injuries. CONTROL OF INSECTS ATTACKING STORED TOBACCO 21 1. All electrical equipment of an electrically operated dusting machine, includ- ing motor, switches, and attachment plug, should be of the type approved for dust-laden atmospheres, and the frame of the dusting machine and discharge nozzle should be effectively grounded to prevent static electricity accumulation. Fan blades of the blower should be constructed of a nonferrous metal. 2. During dusting operations all electrical equipment other than that directly connected to the dusting machine should be disconnected and no open flames or other sources of ignition should be allowed in the building. 3. No internal-combustion engine furnishing power for an insecticide duster should be used or stored inside any principal building or additions thereto. Wind movement in excess of 5 to 7 miles per hour seriously inter- feres with dusting in open warehouses, both by hindering the proper distribution of the insecticide and by carrying it outside; there-. FlGURE 16. -The power duster and operating crew applying pyrethrum powder to a section of an open warehouse. fore, applications should be made when conditions are as calm as possible. Rainy weather does not interfere provided the dust is not allowed to get wet. Pyrethrum powder is eifective only against adult tobacco moths, and for this reason applications should be made when moths are present in the storages. Suction-light-trap catches serve as a satisfactory gage of moth abundance. Operation of the traps should start in April, the time depending on the temperature, and the dust should be applied weekly as long as the average catch of tobacco moths per trap exceeds about 25 per week. The use of pyrethrum powder in open warehouses has the following objectionable features: (1) After a season of dusting a coating of the pyrethrum powder covers the containers of tobacco, and thi
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