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Visual cues of oviposition sites and spectral sensitivity of Cydia strobilella L.

Jakobsson, Johan LU ; Henze, Miriam J. LU ; Svensson, Glenn P. LU ; Lind, Olle LU and Anderbrant, Olle LU (2017) In Journal of Insect Physiology 101. p.161-168
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... (More)

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 λmax = 526 nm, a blue-sensitive receptor with λmax = 436 nm, and an ultraviolet-sensitive receptor with λmax = 352 nm. 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.

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Contribution to journal
publication status
published
subject
in
Journal of Insect Physiology
volume
101
pages
8 pages
publisher
Elsevier Ltd
external identifiers
  • scopus:85026899333
  • wos:000411547500020
ISSN
0022-1910
DOI
10.1016/j.jinsphys.2017.06.006
language
English
LU publication?
yes
id
e2ef594c-2ac2-4ce9-ab80-8437ae1d5b13
date added to LUP
2017-08-29 15:02:51
date last changed
2018-01-16 13:23:52
@article{e2ef594c-2ac2-4ce9-ab80-8437ae1d5b13,
  abstract     = {<p>We investigated whether the spruce seed moth (<i>Cydia strobilella</i> 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 <i>P. abies</i> 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 <i>C. strobilella</i> has at least three spectral types of photoreceptor; an abundant green-sensitive receptor with maximal sensitivity at wavelength λ<sub>max</sub> = 526 nm, a blue-sensitive receptor with λ<sub>max</sub> = 436 nm, and an ultraviolet-sensitive receptor with λ<sub>max</sub> = 352 nm. 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.</p>},
  author       = {Jakobsson, Johan and Henze, Miriam J. and Svensson, Glenn P. and Lind, Olle and Anderbrant, Olle},
  issn         = {0022-1910},
  language     = {eng},
  month        = {08},
  pages        = {161--168},
  publisher    = {Elsevier Ltd},
  series       = {Journal of Insect Physiology},
  title        = {Visual cues of oviposition sites and spectral sensitivity of <i>Cydia strobilella</i> L.},
  url          = {http://dx.doi.org/10.1016/j.jinsphys.2017.06.006},
  volume       = {101},
  year         = {2017},
}