Abstract
When the alfalfa [Bruchophagus roddi (Gussakovsky)], clover [Bruchophagus gibbus (Boheman)], and trefoil seed chaldds (TSC) [Bruchophagus platypterus (Walker)] were exposed to yellow, white, green, and purple painted polyethylene vials perforated by four small holes, only the latter species had a color preference, and that was for yellow, the color of its host flower. When TSC were exposed to green and yellow targets 5 h after sunrise, they preferred yellow targets but not 1 h after sunrise. The possibility of a circadian response was eliminated because different sequences of light-dark regimes prior to the test did not change the results. When TSC were exposed only to yellow targets, half of which had trefoil flowers hidden within, females preferred targets with flowers. When an identical test was conducted but with green instead of yellow targets, the preference for targets with flowers disappeared. In a four-choice test, TSC preferred yellow targets with or without flowers to green targets with or without flowers. Thus, TSC displayed an olfactory response only when the color yellow was present. In unfiltered skylight females preferred baited targets when the test began 3 h before or 1 h after solar noon but not 4 h before or 2 h after solar noon. Chalcids did display an olfactory preference 4 h before solar noon when a Polaroid filter was used to filter skylight and provide an east-west but not a north-south E-vector. When Helmholtz coils were used to apply a magnetic field that canceled or changed the direction of the earth's magnetic field, olfactory preference disappeared because the applied magnetic field changed TSC perception of the E-vector. In effect, TSC must perceive yellow in the presence of an east-west E-vector to display an olfactory preference to a choice of odors. We believe this is the first report that the E-vector of celestial light can influence olfactory and visual behavior of an insect.
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Kamm, J.A., Fairchild, C.E., Gavin, W.E. et al. Influence of celestial light on visual and olfactory behavior of seed chalcids (Hymenoptera: Eurytomidae). J Insect Behav 5, 273–287 (1992). https://doi.org/10.1007/BF01049294
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DOI: https://doi.org/10.1007/BF01049294