Inexpensive Japanese Beetle Traps

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Abstract
Development of a cheap trap effected a saving of $30,000 with no loss in efficiency in the Japanese beetle control program for Maryland during 1939. Comparative studies on the efficiency of the Maryland 1939 trap, the Government control trap, patent 1968954, and the Federal scouting trap showed the Government control trap was the least efficient with the Maryland trap most efficient by 10%. Traps made of wood and paraffin-treated and painted cardboard were efficient; paper traps were too fragile. Traps painted green and white were much more efficient than aluminum painted and galvanized traps. Painting the inside of the funnel white was only slightly more effective than painting it green. Traps having a 60[degree] funnel pitch were more effective than 45[degree] or 80[degree] funnels, and a f-inch bottom aperture more effective than a 1-inch aperture. A supporting rod of galvanized wire No. "0" 66 inches over all was used. Traps suspended 31/2 ft. from the ground proved more efficient than traps 41/2 and 51/2 ft. from the ground. A new unassembled trap of high efficiency, with a 1-gallon beetle container and rod, complete except for bait, can be manufactured and delivered for 271/2c.

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