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Non-host volatile blend optimization for forest protection against the European Spruce Bark Beetle, Ips typographus

Unelius, Rikard C; Schiebe, Christian; Bohman, Björn; Andersson, Martin N LU and Schlyter, Fredrik (2014) In PLoS ONE 9. p.1-85381
Abstract
Conifer feeding bark beetles (Coleoptera, Curculionidae, Scolytinae) pose a serious economic threat to forest production.

Volatiles released by non-host angiosperm plants (so called non-host volatiles, NHV) have been shown to reduce the risk of

attack by many bark beetle species, including the European spruce bark beetle, Ips typographus. However, the most active

blend for I. typographus, containing three green leaf volatiles (GLVs) in addition to the key compounds trans-conophthorin

(tC) and verbenone, has been considered too expensive for use in large-scale management. To lower the cost and improve

the applicability of NHV, we aim to simplify the blend without compromising its anti-attractant... (More)
Conifer feeding bark beetles (Coleoptera, Curculionidae, Scolytinae) pose a serious economic threat to forest production.

Volatiles released by non-host angiosperm plants (so called non-host volatiles, NHV) have been shown to reduce the risk of

attack by many bark beetle species, including the European spruce bark beetle, Ips typographus. However, the most active

blend for I. typographus, containing three green leaf volatiles (GLVs) in addition to the key compounds trans-conophthorin

(tC) and verbenone, has been considered too expensive for use in large-scale management. To lower the cost and improve

the applicability of NHV, we aim to simplify the blend without compromising its anti-attractant potency. Since the key

compound tC is expensive in pure form, we also tested a crude version: technical grade trans-conophthorin (T-tC). In

another attempt to find a more cost effective substitute for tC, we evaluated a more readily synthesized analog: dehydroconophthorin

(DHC). Our results showed that 1-hexanol alone could replace the three-component GLV blend containing 1-

hexanol, (3Z)-hexen-1-ol, and (2E)-hexen-1-ol. Furthermore, the release rate of tC could be reduced from 5 mg/day to

0.5 mg/day in a blend with 1-hexanol and (–)-verbenone without compromising the anti-attractant activity. We further

show that T-tC was comparable with tC, whereas DHC was a less effective anti-attractant. DHC also elicited weaker

physiological responses in the tC-responding olfactory receptor neuron class, providing a likely mechanistic explanation for

its weaker anti-attractive effect. Our results suggest a blend consisting of (–)-verbenone, 1-hexanol and technical transconophthorin

as a cost-efficient anti-attractant for forest protection against I. typographus. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
PLoS ONE
volume
9
pages
1 - 85381
publisher
Public Library of Science
external identifiers
  • scopus:84897974655
ISSN
1932-6203
DOI
10.1371/journal.pone.0085381
language
English
LU publication?
yes
id
9c93d7a9-c207-45e5-b415-5526c4c919b2 (old id 4275579)
date added to LUP
2014-01-28 13:03:53
date last changed
2017-01-01 05:39:23
@article{9c93d7a9-c207-45e5-b415-5526c4c919b2,
  abstract     = {Conifer feeding bark beetles (Coleoptera, Curculionidae, Scolytinae) pose a serious economic threat to forest production.<br/><br>
Volatiles released by non-host angiosperm plants (so called non-host volatiles, NHV) have been shown to reduce the risk of<br/><br>
attack by many bark beetle species, including the European spruce bark beetle, Ips typographus. However, the most active<br/><br>
blend for I. typographus, containing three green leaf volatiles (GLVs) in addition to the key compounds trans-conophthorin<br/><br>
(tC) and verbenone, has been considered too expensive for use in large-scale management. To lower the cost and improve<br/><br>
the applicability of NHV, we aim to simplify the blend without compromising its anti-attractant potency. Since the key<br/><br>
compound tC is expensive in pure form, we also tested a crude version: technical grade trans-conophthorin (T-tC). In<br/><br>
another attempt to find a more cost effective substitute for tC, we evaluated a more readily synthesized analog: dehydroconophthorin<br/><br>
(DHC). Our results showed that 1-hexanol alone could replace the three-component GLV blend containing 1-<br/><br>
hexanol, (3Z)-hexen-1-ol, and (2E)-hexen-1-ol. Furthermore, the release rate of tC could be reduced from 5 mg/day to<br/><br>
0.5 mg/day in a blend with 1-hexanol and (–)-verbenone without compromising the anti-attractant activity. We further<br/><br>
show that T-tC was comparable with tC, whereas DHC was a less effective anti-attractant. DHC also elicited weaker<br/><br>
physiological responses in the tC-responding olfactory receptor neuron class, providing a likely mechanistic explanation for<br/><br>
its weaker anti-attractive effect. Our results suggest a blend consisting of (–)-verbenone, 1-hexanol and technical transconophthorin<br/><br>
as a cost-efficient anti-attractant for forest protection against I. typographus.},
  author       = {Unelius, Rikard C and Schiebe, Christian and Bohman, Björn and Andersson, Martin N and Schlyter, Fredrik},
  issn         = {1932-6203},
  language     = {eng},
  pages        = {1--85381},
  publisher    = {Public Library of Science},
  series       = {PLoS ONE},
  title        = {Non-host volatile blend optimization for forest protection against the European Spruce Bark Beetle, <i>Ips typographus</i>},
  url          = {http://dx.doi.org/10.1371/journal.pone.0085381},
  volume       = {9},
  year         = {2014},
}