Swormlure-4: A New Formulation of the Swormlure-2 Mixture as an Attractant for Adult Screwworms, Cochliomyia hominivorax (Diptera: Calliphoridae)1

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Abstract
Fifteen candidate mixtures in which the ratios of the 10 components found in swormlure-2 (SL-2) were altered and compared with SL-2 for attractiveness to adult Cochliomyia hominivorax (Coquerel). The most attractive mixture (SL-4), differed from SL-2 in that it contained higher amounts of the components with the four lowest boiling points (bp) and lower amounts of the components with the six highest bp. Wind-oriented (WO) traps baited with SL-4 captured 40 and 81% more sterile and wild C. hominivorax (Coquerel), respectively, than SL-2 baited WO traps during 7 days of exposure. Sex ratios for sterile and wild screwworms captured in SL-4- and SL-2-baited traps were similar. SL-4 captured 19% more C. macellaria (F.) and 28% more “other Diptera” than SL-2. SL-4 was almost twice as volatile as SL-2. Dosage and response for SL-4 and SL-2, respectively, showed some positive correlations; we concluded that both the new composition and higher dosage were responsible for the increased attractiveness of SL-4.

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