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Differential response of male and female Diabrotica speciosa (Coleoptera: Chrysomelidae) to bitter cucurbit-based toxic baits in relation to the treated area size
- Cabrera Walsh, G., Mattioli, Federico, Weber, Donald C.
- International journal of pest management 2014 v.60 no.2 pp. 128-135
- Cucurbitaceae, Diabrotica speciosa, baits, females, males, phagostimulants, plant extracts, sex ratio, sticky traps, toxicity
- Cucurbitacin-rich extracts are phagostimulants for both male and female Luperini, but field trials reveal that males are far more attracted to them than females. The sex ratio and number of beetles killed by an application of cucurbitacin-based toxic baits was assessed at two different scales: small areas of 100 m ², and a larger area of 10,000 m ². The small area bait applications killed mostly males (95.2%), but the 1-ha treated plot showed a lower sexual bias (57% male). An earlier study indicated point sources (sticky traps) attracted only males. Results indicate that the distance attraction to bitter cucurbit extracts is almost exclusive to males, but the wide dispersal of a toxic bait based on them should promote encounter and control of both sexes within the treated area. No significant non-target effects were observed.