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J Chem Ecol

Title:		"Identification of a New Blend of Host Fruit Volatiles from Red Downy Hawthorn, Crataegus mollis, Attractive to Rhagoletis pomonella Flies from the Northeastern United States"
Author(s):		Cha DH; Powell THQ; Feder JL; Linn CE;
Address:		"Department of Entomology, NYS Agricultural Experiment Station, Cornell University, Geneva, NY, 14456, USA. Dong.Cha@ARS.USDA.GOV. US Pacific Basin Agricultural Research Center, USDA-ARS, Hilo, HI, 96720, USA. Dong.Cha@ARS.USDA.GOV. Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, 46656, USA. Department of Biological Sciences, Binghamton University - State University of New York, Binghamton, NY, 13902, USA. Department of Entomology, NYS Agricultural Experiment Station, Cornell University, Geneva, NY, 14456, USA"
Journal Title:		J Chem Ecol
Year:		2018
Volume:		20180620
Issue:		7-Aug
Page Number:		671 - 680
DOI:		10.1007/s10886-018-0977-6
ISSN/ISBN:		1573-1561 (Electronic) 0098-0331 (Linking)
Abstract:		"A new blend of volatiles was identified for the fruit of downy red hawthorn, Crataegus mollis, that is attractive to Rhagoletis pomonella flies infesting this host in the northeastern USA. The new blend was as attractive as the previously identified mixture but is more complex in the number of odorants (six in the old versus ten in the new) and differs significantly in the ratio of three volatiles, 3-methylbutan-1-ol, butyl hexanoate, and dihydro-beta-ionone, that are common to both blends and exerted agonist or antagonist effects on behavior in a flight tunnel assay. However, behavioral results with the old and new northern hawthorn blends, as well as modified blends with substituted ratios of 3-methylbutan-1-ol, butyl hexanoate, dihydro-beta-ionone, indicated that the 'agonist' or 'antagonist' effects of these volatiles depended on the ratio, or balance of compounds within the blend. In addition, the new blend contains a number of esters identified from the headspace of domesticated apple, Malus domestica, that are attractive to apple-origin R. pomonella, and present in the five other blends from southern hawthorns, including the southern C. mollis var. texana blend, but are not part of the previously identified blend from northern C. mollis fruit. This finding supports the hypothesis that in addition to providing specificity to the odor blends of the northern and southern hawthorn populations, the presence of the significant amounts of ester compounds in the new northern hawthorn blend might have provided a source of standing variation that could help explain the shift in host preference by C. mollis-infesting flies to introduced apple in the mid-1800's"
Keywords:		"Animals Arthropod Antennae/physiology Behavior, Animal/physiology Crataegus/*chemistry/metabolism Fruit/chemistry/metabolism Gas Chromatography-Mass Spectrometry Host-Parasite Interactions Malus/chemistry/metabolism New England Smell Tephritidae/*physiolo;"
Notes:		"MedlineCha, Dong H Powell, Thomas H Q Feder, Jeffrey L Linn, Charles E Jr eng 0614378/NSF/ 2018/06/21 J Chem Ecol. 2018 Aug; 44(7-8):671-680. doi: 10.1007/s10886-018-0977-6. Epub 2018 Jun 20"