De novo biosynthesis of the aggregation pheromone components ipsenol and ipsdienol by the pine bark beetles Ips paraconfusus Lanier and Ips pini (Say) (Coleoptera: Scolytidae).

A paradigm developed in the 1970s thatIpsbark beetles biosynthesize their aggregation pheromone components ipsenol and ipsdienol by hydroxylating myrcene, a host tree monoterpene. Similarly, hostα-pinene was hydroxylated to a third pheromone componentcis-verbenol. In 1990, however, we reported that amounts of ipsenol and ipsdienol produced by maleIps paraconfusus(Coleoptera: Scolytinae) feeding in five host pine species were nearly the same, even though no detectable myrcene precursor was detected in one of these pines (Pinus sabiniana). Subsequent research showed ipsenol and ipsdienol are also biosynthesized from smaller precursors such as acetate and mevalonate, and thisde novopathway is the major one, while host tree myrcene conversion by the beetle is the minor one. We report concentrations of myrcene,α-pinene and other major monoterpenes in five pine hosts (Pinus ponderosa,P. lambertiana,P. jeffreyi,P. sabiniana, andP. contorta) ofI. paraconfusus. A scheme for biosynthesis of ipsdienol and ipsenol from myrcene and possible metabolites such as ipsenone is presented. Mass spectra and quantities of ipsenone are reported and its possible role in biosynthesis of aggregation pheromone. Coevolution of bark beetles and host trees is discussed in relation to pheromone biosynthesis, host plant selection/suitability, and plant resistance.

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Frontalin: De novo biosynthesis of an aggregation pheromone component by Dendroctonus spp. bark beetles (Coleoptera: Scolytidae)

Insect Biochemistry and Molecular Biology ◽

10.1016/s0965-1748(03)00069-9 ◽

2003 ◽

Vol 33 (8) ◽

pp. 773-788 ◽

Cited By ~ 45

Author(s):

Lana S. Barkawi ◽

Wittko Francke ◽

Gary J. Blomquist ◽

Steven J. Seybold

Keyword(s):

Aggregation Pheromone ◽

Bark Beetles ◽

De Novo ◽

Pheromone Component ◽

De Novo Biosynthesis

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The occurrence and pathogenicity of Geosmithia spp. and common blue-stain fungi associated with pine bark beetles in planted forests in Israel

European Journal of Plant Pathology ◽

10.1007/s10658-015-0713-9 ◽

2015 ◽

Vol 143 (4) ◽

pp. 627-639 ◽

Cited By ~ 9

Author(s):

Mally Dori-Bachash ◽

Liat Avrahami-Moyal ◽

Alex Protasov ◽

Zvi Mendel ◽

Stanley Freeman

Keyword(s):

Bark Beetles ◽

Pine Bark ◽

Planted Forests ◽

Blue Stain Fungi ◽

Pine Bark Beetles ◽

Blue Stain

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Bark Beetles,Pityogenes bidentatus, Orienting to Aggregation Pheromone Avoid Conifer Monoterpene Odors When Flying but Not When Walking

Psyche A Journal of Entomology ◽

10.1155/2012/940962 ◽

2012 ◽

Vol 2012 ◽

pp. 1-10 ◽

Cited By ~ 3

Author(s):

John A. Byers

Keyword(s):

Picea Abies ◽

Pinus Sylvestris ◽

Aggregation Pheromone ◽

Bark Beetles ◽

Slow Rotation ◽

Scotch Pine ◽

Release Rates ◽

Host Trees ◽

Pheromone Components ◽

Males And Females

Previous studies and data presented here suggest that odors from healthy host Scotch pine (Pinus sylvestris) and nonhost Norway spruce (Picea abies), as well as major monoterpenes of these trees at natural release rates, significantly reduce the attraction of flying bark beetles,Pityogenes bidentatus, of both sexes to their aggregation pheromone components grandisol andcis-verbenol in the field, as tested by slow rotation of trap pairs. In contrast,P. bidentatusmales and females walking in an open-arena olfactometer in the laboratory did not avoid monoterpene vapors at release rates spanning several orders of magnitude in combination with aggregation pheromone. The bark beetle may avoid monoterpenes when flying as a mechanism for avoiding nonhost species, vigorous and thus unsuitable host trees, as well as harmful resinous areas of hosts. Inhibition of this flight avoidance response in beetles after landing would allow them to initiate, or to find and enter, gallery holes with high monoterpene vapor concentrations in order to feed and reproduce.

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1-Octen-3-ol is repellent to Ips pini (Coleoptera: Curculionidae: Scolytinae) in the midwestern United States

The Canadian Entomologist ◽

10.4039/n09-002 ◽

2009 ◽

Vol 141 (2) ◽

pp. 158-160 ◽

Cited By ~ 3

Author(s):

Therese M. Poland ◽

Deepa S. Pureswaran ◽

Tina M. Ciaramitaro ◽

John H. Borden

Keyword(s):

United States ◽

Aggregation Pheromone ◽

Bark Beetles ◽

Field Experiments ◽

Ips Pini ◽

Midwestern United States ◽

Pine Engraver ◽

Aggregation Behaviour

AbstractIn field experiments at three sites in Michigan and Ohio we tested the activity of 1-octen-3-ol in combination with ipsdienol, the aggregation pheromone of the pine engraver, Ips pini (Say). When 1-octen-3-ol was added to funnel traps baited with ipsdienol, significantly fewer beetles of either sex were captured than in traps baited with ipsdienol alone. This result suggests that the compound is potentially repellent and interrupts the response of beetles to their aggregation pheromone, and is consistent with previous reports of its inhibition of aggregation behaviour in other bark beetles.

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