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J Insect Physiol

Title:		Visual cues of oviposition sites and spectral sensitivity of Cydia strobilella L
Author(s):		Jakobsson J; Henze MJ; Svensson GP; Lind O; Anderbrant O;
Address:		"Department of Biology, Lund University, Sweden. Electronic address: johan.jakobsson@biol.lu.se. Department of Biology, Lund University, Sweden; Brain Research Institute, University of Queensland, Australia. Department of Biology, Lund University, Sweden. Department of Philosophy, Lund University, Sweden"
Journal Title:		J Insect Physiol
Year:		2017
Volume:		20170701
Issue:
Page Number:		161 - 168
DOI:		10.1016/j.jinsphys.2017.06.006
ISSN/ISBN:		1879-1611 (Electronic) 0022-1910 (Linking)
Abstract:		"We investigated whether the spruce seed moth (Cydia strobilella L., Tortricidae: Grapholitini), an important pest in seed orchards of Norway spruce (Picea abies (L.) Karst.), can make use of the spectral properties of its host when searching for flowers to oviposit on. Spectral measurements showed that the flowers, and the cones they develop into, differ from a background of P. abies needles by a higher reflectance of long wavelengths. These differences increase as the flowers develop into mature cones. Electroretinograms (ERGs) in combination with spectral adaptation suggest that C. strobilella has at least three spectral types of photoreceptor; an abundant green-sensitive receptor with maximal sensitivity at wavelength lambda(max)=526nm, a blue-sensitive receptor with lambda(max)=436nm, and an ultraviolet-sensitive receptor with lambda(max)=352nm. Based on our spectral measurements and the receptor properties inferred from the ERGs, we calculated that open flowers, which are suitable oviposition sites, provide detectable achromatic, but almost no chromatic contrasts to the background of needles. In field trials using traps of different spectral properties with or without a female sex pheromone lure, only pheromone-baited traps caught moths. Catches in baited traps were not correlated with the visual contrast of the traps against the background. Thus, visual contrast is probably not the primary cue for finding open host flowers, but it could potentially complement olfaction as a secondary cue, since traps with certain spectral properties caught significantly more moths than others"
Keywords:		"Animals Cues Female Flowers Male Moths/*physiology *Oviposition Photoreceptor Cells, Invertebrate/classification/*physiology Picea *Visual Perception;"
Notes:		"MedlineJakobsson, Johan Henze, Miriam J Svensson, Glenn P Lind, Olle Anderbrant, Olle eng Research Support, Non-U.S. Gov't England 2017/07/06 J Insect Physiol. 2017 Aug; 101:161-168. doi: 10.1016/j.jinsphys.2017.06.006. Epub 2017 Jul 1"