Effect of silhouette color on trap catches of Dendroctonus frontalis (Coleoptera : Scolytidae)

Citation
Bl. Strom et Ra. Goyer, Effect of silhouette color on trap catches of Dendroctonus frontalis (Coleoptera : Scolytidae), ANN ENT S A, 94(6), 2001, pp. 948-953
Citations number
34
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Entomology/Pest Control
Journal title
ANNALS OF THE ENTOMOLOGICAL SOCIETY OF AMERICA
ISSN journal
0013-8746 → ACNP
Volume
94
Issue
6
Year of publication
2001
Pages
948 - 953
Database
ISI
SICI code
0013-8746(200111)94:6<948:EOSCOT>2.0.ZU;2-3
Abstract
With the exception of responses to semiochemicals, host selection behaviors of . frontalis are largely unstudied. To better understand the host findin g behavior of D.frontalis, and to identify Potential visual disruptants, we evaluated the response of D. frontalis to multiple-funnel traps of eight d ifferent colors, Multiple-funnel traps provide an attractive vertical silho uette, similar to a host stem, that aids in capturing bark beetles and allo ws for controlled evaluation of visual cues. Evaluation of mean trap catch of each color by analysis of variance (ANOVA) produced two separate groups: white and yellow traps caught significantly fewer D. frontalis than the ot her six colors tested (black, blue, brown. gray, green, red). Examination o f spectral reflectance curves showed that the eight colors could be natural ly placed into two groups, those with high peak reflectance (white and yell ow) and those with low peak reflectance (black, blue, brown. gray, green, r ed). When high and low peak reflectance were substituted for color in a sep arate ANOVA, reflectance group was as good as color at explaining the varia bility in trap catch (r(2) = 0.88 versus 0.92). Therefore, hue (dominant wa velength) was unimportant in affecting D.frontalis host finding behavior at the reflectance levels we tested and, thus, we found no strong evidence th at differential wavelength sensitivity affected the response of D. frontali s. These results, show that dark colored silhouettes (those with low reflec tance values), regardless of hue, are best for capturing D. frontalis, whil e white or yellow are the best candidate colors for disrupting host finding .