Sarfo, Joseph E., Campbell, Colin A.M. and Hall, David R. ORCID: https://orcid.org/0000-0002-7887-466X (2020) Effect of lure age and blend on sex pheromone trap catches of the mirid Sahlbergella singularis on cacao in Ghana. Crop Protection, 138:105344. ISSN 0261-2194 (doi:10.1016/j.cropro.2020.105344)

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Abstract

Mirids, Sahlbergella singularis and Distantiella theobroma (Heteroptera: Miridae), are the main cacao pests in West Africa. Females of both species produce sex pheromones composed of hexyl (R)-3-((E)-2-butenoyl)-butyrate and hexyl (R)-3-hydroxybutyrate, the major and minor components, respectively. Lures composed of 1000:500 µg blends of the two components pre-aged for 2, 4, 8 and 12 weeks were compared with fresh lures in a field experiment in Ghana. Lures were replaced monthly. A total of 272 S. singularis, all male, was caught. Fresh lures and those pre-aged for 2 and 4 weeks caught similar numbers in a month while lures pre-aged for 8 and 12 weeks caught 34 % and 26 %, respectively, than fresh lures. The attractiveness of five different pheromone blends were compared in a 15-month field trapping experiment. A total of 701 S. singularis, all male, was caught. The highest numbers were caught in traps releasing both components with no significant difference among 1000:50, 1000:500 and1000:1000 µg blends. Traps releasing hexyl (R)-3-((E)-2-butenoyl)-butyrate alone caught fewer individuals than two-component blends, and those releasing hexyl (R)-3-hydroxybutyrate alone caught similarly low numbers to unbaited controls. We recommend that 2:1 blend lures, renewed at least bi-monthly are used for mass-trapping cacao mirids. The results are discussed in relation to previously published mirid pheromone blend optimisation and longevity studies.

Item Type:	Article
Uncontrolled Keywords:	theobroma cacao, pheromone trap, sahlbergella singularis, lure longevity, pheromone blend
Subjects:	S Agriculture > S Agriculture (General)
Faculty / School / Research Centre / Research Group:	Faculty of Engineering & Science Faculty of Engineering & Science > Natural Resources Institute Faculty of Engineering & Science > Natural Resources Institute > Agriculture, Health & Environment Department Faculty of Engineering & Science > Natural Resources Institute > Chemical Ecology Research Group
Last Modified:	09 Aug 2021 01:38
URI:	http://gala.gre.ac.uk/id/eprint/29575

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