Abstract
Fluorescein sodium, a water soluble dye detectable under UV light, proved to be an excellent material for marking adult Cochliomyia hominivorax (Coquerel). The dye was detected by squashing adult screwworms on white filter paper and then viewing the resulting squash under short wavelength (2537 A) UV light. When fluorescein sodium was incorporated into adult food (3 parts water: 1 part corn syrup) at concentrations of 0.01–5.0%, it gave 100% initial marking and 97% marking after 14 days at the highest concentration. Addition of the dye to the food did not affect adult mortality at concentrations tested. Seventy-five % of the flies that were allowed to feed 10 sec on Screwworm Adult Suppression System (SWASS) units containing 5% fluorescein sodium (no insecticide) retained detectable amounts of this dye at 13 days after the initial feeding. The addition of 5% dye to the SWASS units did not affect their attractiveness. When 50 SWASS units containing 5% dye (no insecticide) were equally distributed over 2.6 km2 areas, from 17–25% of the screwworms and up to 35% of the secondary screwworm, C. macellaria (F.), captured in swormlure-baited traps placed within the areas had ingested detectable amounts of the dye within 24 h after the units were dispensed.
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