Réponses électrophysiologiques et comportementales de Dendroctonus valens à des composés volatils non-hôtes

Zhang, Long-wa; Gillette, Nancy E.; Jian, Sun

doi:10.1051/forest:2007004

Cited by 14 publications

(11 citation statements)

References 22 publications

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“…Exceptions were attraction of T. chlorodia to exo-brevicomin and disruption of D. valens by verbenone and verbenone ϩ GLV. Both of these effects were expected (Bedard et al 1969, Gillette et al 2001, Fettig et al 2005, Zhang et al 2007), but it is of interest to note that the disruption of D. valens was signiÞcant despite the differences between our D. jeffreyi attractant and the typical host monoterpenes used to attract D. valens (Zhang et al 2007). For T. chlorodia, interaction plots suggest that the combination of heptanol release rate and exo-brevicomin presence were involved in attraction.…”

Section: Discussionmentioning

confidence: 80%

Attractant and Disruptant Semiochemicals forDendroctonus jeffreyi(Coleoptera: Curculionidae: Scolytinae)

2013

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Jeffrey pine, Pinus jeffreyi Greville and Balfour, is a dominant yellow pine and important overstory component of forests growing on diverse sites from southwestern Oregon to Baja California to western Nevada. The Jeffrey pine beetle, Dendroctonus jeffreyi Hopkins (Coleoptera: Curculionidae: Scolytinae), is monophagous on Jeffrey pine and its primary insect pest. Despite the importance of P. jeffreyi, difficult terrain, environmental concerns, and lack of roads can constrain pest management activities. Semiochemicals are often easier to apply and more environmentally acceptable than other options, but they are lacking in this system. Attractants have been identified, but field bioassays have been limited because of infrequent or short duration outbreaks and a lack of beetles during nonoutbreak periods. Disruptant semiochemicals have not been assessed for D. jeffreyi during outbreak conditions; however, commercially available semiochemicals have been implicated as disruptants for this bark beetle. The objective of this study was to identify the most effective commercially available attractant and disruptant semiochemicals for D. jeffreyi. Our highest observed catch occurred with the blend of 5% 1-heptanol and 95% n-heptane. When this was used to challenge potential disruptant semiochemicals, the combination of S-(-)-verbenone and the green leaf volatile blend (cis-3-Hexenol and 1-Hexanol) reduced trap catch by ≍80%. However, frontalin was most effective, reducing the number of D. jeffreyi caught by >96%. Within each year of the study, the percentage female of D. jeffreyi caught with our attractant decreased from start to end of the experimental period. On average, our first collection in a year (mid-June to early July) was 59% female, whereas our last (mid-August) was 34%. Frontalin was equally or more effective against females (the pioneering sex) than males, providing optimism that semiochemical disruption may be possible for protecting Jeffrey pines from D. jeffreyi.

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Section: Discussionmentioning

confidence: 80%

Attractant and Disruptant Semiochemicals forDendroctonus jeffreyi(Coleoptera: Curculionidae: Scolytinae)

2013

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“…Where it is most invasive, in northern China, Sun et al found that certain ratios of host monoterpenes (α-pinene:β-pinene:3-carene = 1∶1∶1) and even 3-carene alone efficiently attracted RTBs[32]. Moreover, another study showed the number of D. valens attracted to kairomone-baited traps was reduced by nonhost volatiles(NHVs) by 26.3 to 70% [33], a finding confirmed by other studies [34], [35], indicating that NHVs might help beetles to discriminate among potential hosts in the field. This research suggested that primary attraction has an important role in host selection of D. valens .…”

Section: Introductionmentioning

confidence: 99%

Monoterpene Variation Mediated Attack Preference Evolution of the Bark Beetle Dendroctonus valens

Liu

Wáng

et al. 2011

PLoS ONE

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Several studies suggest that some bark beetle like to attack large trees. The invasive red turpentine beetle (RTB), Dendroctonus valens LeConte, one of the most destructive forest pests in China, is known to exhibit this behavior. Our previous study demonstrated that RTBs preferred to attack large-diameter trees (diameter at breast height, DBH ≥30 cm) over small-diameter trees (DBH ≤10 cm) in the field. In the current study, we studied the attacking behavior and the underlying mechanisms in the laboratory. Behavioral assays showed that RTBs preferred the bark of large-DBH trees and had a higher attack rate on the bolts of these trees. Y-tube assays showed that RTBs preferred the volatiles released by large-DBH trees to those released by small-DBH trees. Subsequent analysis revealed that both large- and small-DBH trees had the same composition of monoterpenes, but the concentration of each component differed; thus it appeared that the concentrations acted as cues for RTBs to locate the right-sized host which was confirmed by further behavioral assays. Moreover, large-DBH pine trees provided more spacious habitat and contained more nutrients, such as nitrogen, than did small-DBH pine trees, which benefited RTBs' fecundity and larval development. RTBs seem to have evolved mechanisms to locate those large hosts that will allow them to maximize their fitness. Monoterpene variation mediated attack preference implies the potential for the management of RTB.

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“…Cues identified as attractive in an olfactometer are expected to correspond to cues used naturally in the field (recent examples include Lou et al 2006; Dormont et al 2007; Zahng et al 2007). However, this is not always the case (i.e.…”

Section: Introductionmentioning

confidence: 99%

Olfactory Attraction of the Larval Parasitoid,Hyposoter horticola, to Plants Infested with Eggs of the Host Butterfly,Melitaea cinxia

Castelo¹,

Nouhuys²,

Corley³

2010

Journal of Insect Science

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Parasitoids locate inconspicuous hosts in a heterogeneous habitat using plant volatiles, some of which are induced by the hosts. Hyposoter horticola Gravenhost (Hymenoptera: Ichneumonidae) is a parasitoid of the Glanville fritillary butterfly Melitaea cinxia L. (Lepidoptera: Nymphalidae). Melitaea cinxia lays eggs in clusters on leaves of Plantago lanceolata L. (Lamiales: Plantaginaceae) and Veronica spicata L. (Lamiales: Plantaginaceae). The parasitoid oviposits into host larvae that have not yet hatched from the egg. Thus, though H. horticola is a parasitoid of Melitaea cinxia larvae, it must find host eggs on plants that have not been fed on by the larvae. Using a Y-tube olfactometer, the response of H. horticola to odors of Melitaea cinxia and extracts of the attacked plant species were tested. Three week-old eggs (near hatching) were attractive to young H. horticola, but one week-old eggs were attractive only to old or experienced H. horticola. Melitaea cinxia larvae were not attractive. A water extract of P. lanceolata was attractive, but ethanol or hexane extracts were not. None of the extracts of V. spicata were attractive. Leaves of V. spicata were attractive only if harboring eggs, but P. lanceolata leaves with eggs were not. Free flying H. horticola in a large outdoor enclosure were presented with host and plant cues. As in the olfactometer, V. spicata was attractive only when eggs were on it, and P. lanceolata was somewhat attractive with or without eggs. This study shows for the first time that a parasitoid of larvae uses egg volatiles or oviposition-induced plant volatiles, to find host larvae, and that Melitaea cinxia eggs or traces of oviposition induce the production of these volatiles by the plant. Based on the results, and given the natural distribution of the plants and M. cinxia eggs, parasitism of Melitaea cinxia eggs on P. lanceolata would be expected to be low. Instead, under natural conditions, a fraction of the eggs in virtually all egg clusters are parasitized on both plant species. The mismatch between the experimental results and the natural pattern of host-parasitoid interactions is discussed in terms of the expected coupling foraging cues with foraging success.

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Réponses électrophysiologiques et comportementales de Dendroctonus valens à des composés volatils non-hôtes

Cited by 14 publications

References 22 publications

Attractant and Disruptant Semiochemicals forDendroctonus jeffreyi(Coleoptera: Curculionidae: Scolytinae)

Attractant and Disruptant Semiochemicals forDendroctonus jeffreyi(Coleoptera: Curculionidae: Scolytinae)

Monoterpene Variation Mediated Attack Preference Evolution of the Bark Beetle Dendroctonus valens

Olfactory Attraction of the Larval Parasitoid,Hyposoter horticola, to Plants Infested with Eggs of the Host Butterfly,Melitaea cinxia

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