. Cooperative economic insect report. Beneficial insects; Insect pests. SURVEY METHODS - 207 - FLY BAITS AND TRAPS Preliminary tests in Colorado during 1956 showed that fly baits sprayed on beet plants gave rather spectacular results on kills of adult sugar beet root maggots. In 1957 bait traps, using several attractants, particularly hydrolysate materials, were found to attract a wide variety of Diptera. Tests during 1957, beginning in April and continuing weekly until October, gave population data on sugar beet root maggot, seed-corn maggot, western wheat stem maggot and spinach leaf miner.
. Cooperative economic insect report. Beneficial insects; Insect pests. SURVEY METHODS - 207 - FLY BAITS AND TRAPS Preliminary tests in Colorado during 1956 showed that fly baits sprayed on beet plants gave rather spectacular results on kills of adult sugar beet root maggots. In 1957 bait traps, using several attractants, particularly hydrolysate materials, were found to attract a wide variety of Diptera. Tests during 1957, beginning in April and continuing weekly until October, gave population data on sugar beet root maggot, seed-corn maggot, western wheat stem maggot and spinach leaf miner. This method has also proved very successful in determining emer- gence, broods and seasonal activity of these four pests. The study of baiting technique was expanded in 1958. Materials used in Bait Traps for Sugar Beet Root Maggot Adults 1957 A. Dylox, 1 oz., sugar 1 lb., water 2 qts. B. Dylox, 1 oz., sugar 1 lb., water 2 qts., yeast hydrolysate 1/2 oz. C. Dylox, 1 oz., sugar 1 lb., water 2 qts., casein hydrolysate 1/2 oz. D. Dylox, 1 oz., sugar 1 lb., water 2 qts., soy hydrolysate 1/2 oz. E. Dylox, 1/2 oz., water 1 pt., protein bait No. 2* 4 oz. F. Dylox, 1/2 oz., water 1 pt., protein bait Nck 7* 4 Trapping Procedure and Results A wood cylinder inches in diame- ter by 3 inches long, or a corn cob 3 inches long, was dipped in one of the above baits and suspended over the 6-inch funnel of a Japanese beetle trap or a similar funnel-type trap. (see illustration). Flies attracted to the bait dropped into the container under the funnel. All of the above baits caught adults of the sugar beet root maggot. Bait A caught the most and bait D was next in numbers. Bait B, containing yeast hydrolysate, fermented and did not attract many of the root maggot flies but did attract and kill many sarco- phagids and calliphorids. In 1958, the bait traps were modified by replacing the corn cob with a wick in a two (2) ounce salve jar. (L. E. Jenkins). Fly Bait Trap * Protein bait contains
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