The agave weevil, Scyphophorus acupunctatus Gyllenhal (Coleoptera: Curculionidae), is the most important insect pest of wild and cultivated agaves in the world. Combined gas chromatography‐electroantennography (GC‐EAD) analysis of male volatile extracts showed that four peaks elicited antennal responses from males and females. The peaks were identified by GC‐mass spectrometry (GC‐MS) as 2‐methyl‐4‐heptanol (1), 2‐methyl‐4‐octanol (2), 2‐methyl‐4‐heptanone (3), and 2‐methyl‐4‐octanone (4). Electroantennogram (EAG) recordings of both sexes to 0.01‐, 0.1‐, 1‐, and 10‐µg stimulus load of synthetic compounds showed that the dose of the tested compounds and weevil sex significantly influenced the antennal response of S. acupunctatus. However, there was no sexual dimorphism in the antennal responses to the four synthetic compounds evaluated because the EAG profiles revealed no interaction between doses by sex. Antennae of S. acupunctatus were most sensitive to compounds 2 and 4, reaching the threshold at a 0.01‐µg stimulus load. Weevil antennae were less sensitive to compounds 1 and 3, and the threshold response to these compounds was 0.1 µg. Behavioural evaluation of the synthetic compounds showed them to be attractive to both males and females in a Y‐tube olfactometer. Field experiments confirmed the laboratory results, showing that all components, singly or in blends, were attractive to the weevils. In general, traps baited with the quaternary blend of compounds 1–4 captured significantly more weevils than traps baited with males. However, compounds 3 and 4 were sufficient to obtain captures equivalent to those by the quaternary blend. The potential use of the aggregation pheromone in the development of a mass‐trapping programme as a viable pest management alternative for S. acupunctatus is discussed.
In programmes applying the sterile insect technique (SIT), the quality of insects deployed in the field determines the success in preventing, suppressing, containing or eradicating the pest population. In the fruit fly emergence and release facility (ERF) of the Moscamed Program in Mexico, irradiated pupae of Ceratitis capitata are packed in Mexico‐type towers, and key adult quality parameters, such as emergence, fliers and survival, are determined throughout the packing, handling and release process. However, different methodologies are used to estimate the percentage of fliers in the different stages of the process, raising doubts of whether observed differences are due to the effect of each stage or to the methodology used. With this in mind, we developed an alternative called ‘Adult Flier device’ (=AF‐device) to evaluate the adult flier parameter following a critical evaluation path of five steps: (1) upon arrival at ERF, (2) post‐packing, (3) post‐holding, (4) post‐chilling and (5) post‐release, where adult fliers and survival under stress were evaluated. We also compared the current methodologies for the estimation of ‘absolute fliers’ available in different operating manuals. Our results suggest that the AF‐device allows reliable traceability of sterile insect quality parameters throughout the packing and release process, since no significant differences were observed with the control treatments. In the chilling stage, the five methodologies tested were equivalent, but the AF‐device was less time‐consuming and required less manpower and biological material than the other methodological options. Our results demonstrate that the use of the AF‐device can be a feasible, versatile, innovative and efficient alternative to evaluate quality control parameters throughout the process of packing and releasing sterile insects, providing reliable results in a timely manner with less hand labour using minimal biological material.
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