Abstract
Of 724 chemicals screened as repellents for red-winged blackbirds (Agelaius phoeniceus), only 6 satisfied criteria for high repellency and low toxicity. Of these, meiylthio-3,Sxylyl Nmethylcarbamate (methiocarb) and 2-methyl-a,a-diphenyl-1-pyrrolidinebutyramide (DRC 3324) were consistently effective against house sparrows (Passer domesticus), grackles (Quiscalus quiscula), pheasants ( Phasianus colchiclls), bicolored blackbirds ( Agelvius tricolor), brown-headed cowbirds ( Molothrus ater), and California quail (Lophortyx californicus). BIRD REPELLENTS * Schafer and Brunton 569 250 man-hours of labor at $3.00 per hour $ 750 5 pounds of 4-aminopyridine at $60.00 per pound 3d) NIethocel and acetone for 16 gallons of spray 15 Sprayer parts plus one-fourth the cost of sprayer 35
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