Wind-tunnel study on attraction inhibitor in maleColeophora laricella Hbn. (Lepidoptera: Coleophoridae)

Witzgall, Peter; Priesner, E.

doi:10.1007/bf00983768

Cited by 46 publications

(26 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, reducing the modifier's release rate should at least partially duplicate the effects of displacing the modifier, particularly regarding effects 1 and 3 above. In support of this inference, spatial displacement of a modifier (either a synergist or an inhibitor) from the release point of an insect semiochemical generally produces the same outcome as reducing the dose of or eliminating the modifier: displacement of inhibitors increases (McLaughlin et al 1974;Witzgall and Priesner 1991;Liu and Haynes 1992;Rumbo et al 1993;Potting et al 1999), whereas displacement of synergists reduces insect responses to a semiochemical (Linn and Gaston 1981;Byers 1987;Lux et al 1994). However, in experiment 3, reducing the dose of (+)-endo-brevicomin at the center trap caused a reduction in D. frontalis catches at both the center and the adjacent traps, not an increase in catch at the center trap as would be predicted if the relatively higher catch in the outer traps was attributable simply to a relatively lower concentration of (+)-endo-brevicomin at these locations.…”

Section: Discussionmentioning

confidence: 90%

Spatial Displacement of Release Point can Enhance Activity of an Attractant Pheromone Synergist of a Bark Beetle

Sullivan

Mori

2009

J Chem Ecol

View full text Add to dashboard Cite

Flight responses of the southern pine beetle, Dendroctonus frontalis Zimmermann, to widely-spaced (>130 m) traps baited with pine volatiles (in turpentine) and the female-produced pheromone component frontalin were enhanced when a bait containing the male pheromone component (+)-endo-brevicomin was attached directly to the trap. However, displacing this bait 4-16 m horizontally from the trap significantly increased its synergistic effect. (+)-endo-Brevicomin enhanced catch to the same degree when the bait was positioned either on the trap or 32 m away. In another experiment, pairs of frontalin/turpentinebaited traps were established with 4 m spacing between traps and >100 m spacing between pairs. Attachment of either a racemic or (+)-endo-brevicomin bait to one trap of a pair caused a significant increase in catch by both traps, but catch in the trap lacking endo-brevicomin was increased more than in its endo-brevicomin-baited twin. In a third experiment, widely-spaced groups of three traps (in a line with 1 and 4 m spacing between the middle and outer traps) were baited uniformly with frontalin and turpentine, and the release rate of (+)-endo-brevicomin from the middle trap was varied across three orders of magnitude. Release rates sufficient to enhance total D. frontalis catch by the trio also caused relatively higher catches to occur in the outer traps than in the middle one. These experiments indicated that both male and female D. frontalis fly to and land preferentially at sources of frontalin and host odors when these are located some distance away from a source of endo-brevicomin. This behavior may have evolved in D. frontalis to allow host-seeking beetles to locate growing, multi-tree infestations while avoiding fully-colonized trees within these infestations. Our data demonstrate that trap spacing alone can qualitatively change the outcome of bait evaluation trials and may explain why many earlier experiments with endo-brevicomin failed to identify it as an aggregation pheromone synergist for D. frontalis. We believe that important aggregative functions of semiochemicals of other bark beetle species may have been similarly overlooked due to choice of experimental procedures.

show abstract

Section: Discussionmentioning

confidence: 90%

Spatial Displacement of Release Point can Enhance Activity of an Attractant Pheromone Synergist of a Bark Beetle

Sullivan

Mori

2009

J Chem Ecol

View full text Add to dashboard Cite

show abstract

“…An additional nearby attractant source provides intermittent stimulation with pure attractant, and restores upwind attraction, in codling moth (Fig. 1) as in other species (Witzgall and Priesner 1991;Liu and Haynes 1993;Fadamiro et al 1999).…”

Section: Discussionmentioning

confidence: 97%

“…Pheromone antagonists must be perceived simultaneously to suppress upwind orientation behaviour and source location (Witzgall and Priesner 1991;Liu and Haynes 1993), as male moths distinguish between pheromone and antagonist odour filaments at an astounding temporal and spatial resolution (Fadamiro et al 1999). The respective synergists and antagonists are perceived via specialized antennal receptor cells (Priesner 1986;CossØ et al 1998), and differences in the processing of pheromone synergists and antagonists in the antennal lobe are becoming apparent (Christensen et al 1995;Hansson et al 1995).…”

Section: Introductionmentioning

confidence: 99%

Codling moth males do not discriminate between pheromone and a pheromone/antagonist blend during upwind flight

Coracini¹,

Bengtsson²,

Cichón³

et al. 2003

Naturwissenschaften

Self Cite

View full text Add to dashboard Cite

Discrimination between conspecific and heterospecific signals is a key element in the evolution of pheromone-mediated communication in insects. Pheromone antagonists prevent heterospecific attraction. They are typically pheromone synergists in other species and enable specific communication in closely related species, using partly the same chemicals. In codling moth, Cydia pomonella, as in other moths, upwind flights to a pheromone/antagonist blend were slower and more convoluted than to pheromone. However, this deteriorated flight behaviour did not account for the strong decrease in male attraction. The pheromone/antagonist blend blocked instead the onset of upwind flight. This was corroborated by placing a separate source of pheromone close by, which restored male attraction. Males flying upwind did not discriminate between pheromone and the adjacent pheromone/antagonist blend, and landed on either source. This indicates differences in the neural regulation for initiating and maintaining a behavioural response to pheromone.

show abstract

“…Along with our behavioral data, the colocalization of the neurons suggests that the binary mixture constitutes an ecologically significant signal, assuming that selective pairing of ORNs is adaptive and not due to chance. Some male moths have a remarkable ability to distinguish odor filaments from different sources with extremely high spatiotemporal resolution (Fadamiro et al, 1999;Witzgall and Priesner, 1991). It was suggested that such amazing feats depend on ORNs being located within the same sensillum (Fadamiro et al, 1999), which is common among pheromone agonist/antagonist neurons in Lepidoptera Larsson et al, 2002).…”

Section: Discussionmentioning

confidence: 99%

Peripheral modulation of pheromone response by inhibitory host compound in a beetle

Andersson

Larsson

Blaženec

et al. 2010

Journal of Experimental Biology

View full text Add to dashboard Cite

SUMMARYWe identified several compounds, by gas chromatographic-electroantennographic detection (GC-EAD), that were antennally active in the bark beetle Ips typographus and also abundant in beetle-attacked spruce trees. One of them, 1,8-cineole (Ci), strongly inhibited the attraction to pheromone in the field. Single-sensillum recordings (SSRs) previously showed olfactory receptor neurons (ORNs) on I. typographus antennae selectively responding to Ci. All Ci neurons were found within sensilla co-inhabited by a pheromone neuron responding to cis-verbenol (cV); however, in other sensilla, the cV neuron was paired with a neuron not responding to any test odorant. We hypothesized that the colocalization of ORNs had a functional and ecological relevance. We show by SSR that Ci inhibited spontaneous activity of the cV neuron only in sensilla in which the Ci neuron was also present. Using mixtures of cV and Ci, we further show that responses to low doses (1-10ng) of cV were significantly reduced when the colocalized Ci neuron simultaneously responded to high doses (1-10mg) of Ci. This indicated that the response of the Ci neuron, rather than ligand-receptor interactions in the cV neuron, caused the inhibition. Moreover, cV neurons paired with Ci neurons were more sensitive to cV alone than the ones paired with the non-responding ORN. Our observations question the traditional view that ORNs within a sensillum function as independent units. The colocalization of ORNs might sharpen adaptive responses to blends of semiochemicals with different ecological significance in the olfactory landscape.

show abstract

Wind-tunnel study on attraction inhibitor in maleColeophora laricella Hbn. (Lepidoptera: Coleophoridae)

Cited by 46 publications

References 14 publications

Spatial Displacement of Release Point can Enhance Activity of an Attractant Pheromone Synergist of a Bark Beetle

Spatial Displacement of Release Point can Enhance Activity of an Attractant Pheromone Synergist of a Bark Beetle

Codling moth males do not discriminate between pheromone and a pheromone/antagonist blend during upwind flight

Peripheral modulation of pheromone response by inhibitory host compound in a beetle

Contact Info

Product

Resources

About