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Environ Entomol

Title:		The Aggregation Pheromone of Metamasius spinolae (Coleoptera: Dryophthoridae) Revisited: Less is More
Author(s):		Malo EA; Gutierrez-Escobar V; Castrejon-Ayala F; Rojas JC;
Address:		"Grupo de Ecologia de Artropodos y Manejo de Plagas, Departamento de Agricultura, Sociedad y Ambiente, El Colegio de la Frontera Sur (ECOSUR), Tapachula, Chiapas, Mexico, CP. Interacciones Planta-Insecto, Centro de Desarrollo de Productos Bioticos, Instituto Politecnico Nacional, Yautepec, Morelos, Mexico, CP"
Journal Title:		Environ Entomol
Year:		2020
Volume:		49
Issue:		4
Page Number:		803 - 809
DOI:		10.1093/ee/nvaa054
ISSN/ISBN:		1938-2936 (Electronic) 0046-225X (Linking)
Abstract:		"The weevil Metamasius spinolae (Gyllenhal) is the most important insect pest of cultivated prickly pear in Mexico. A previous work reported that the pheromone of this weevil species was composed by three components. In this study, we reinvestigated the aggregation pheromone of M. spinolae using gas chromatography-electroantennography and gas chromatography-mass spectrometry to locate and identify new potential pheromonal compounds. The behavioral activity of identified compounds was evaluated in laboratory and field trials. Metamasius spinolae males released four compounds: 2-methyl-4-heptanone, 6-methyl-2-hepten-4-one, 2-methyl-4-octanone, and 2-hydroxy-2-methyl-4-heptanone. In the laboratory assays, depending on the concentration, the compounds were attractive, neutral, or repellent to M. spinolae. Field evaluation showed that traps baited with 2-hydroxy-2-methyl-4-heptanone singly or in most of the binary or tertiary blends where this compound was present captured a higher number of M. spinolae compared to live males and the other compounds identified. In conclusion, our results indicate that 2-hydroxy-2-methyl-4-heptanone is the main component of the aggregation pheromone of M. spinolae. We suggest that this compound should be used for developing a monitoring or a mass-trapping system for M. spinolae"
Keywords:		Animals *Coleoptera Gas Chromatography-Mass Spectrometry Male Mexico Pheromones *Sex Attractants *Weevils cactus chemical communication male volatile prickly pear weevil;
Notes:		"MedlineMalo, Edi A Gutierrez-Escobar, Veronica Castrejon-Ayala, Federico Rojas, Julio C eng Research Support, Non-U.S. Gov't England 2020/05/28 Environ Entomol. 2020 Aug 20; 49(4):803-809. doi: 10.1093/ee/nvaa054"