HOST RESISTANCE TO THE FIR ENGRAVER BEETLE, SCOLYTUS VENTRALIS (COLEOPTERA: SCOLYTIDAE): 4. EFFECT OF DEFOLIATION ON WOUND MONOTERPENE AND INNER BARK CARBOHYDRATE CONCENTRATIONS

@article{Wright1979HOSTRT,
  title={HOST RESISTANCE TO THE FIR ENGRAVER BEETLE, SCOLYTUS VENTRALIS (COLEOPTERA: SCOLYTIDAE): 4. EFFECT OF DEFOLIATION ON WOUND MONOTERPENE AND INNER BARK CARBOHYDRATE CONCENTRATIONS},
  author={Lawrence C. Wright and Alan A. Berryman and S. Gurusiddaiah},
  journal={The Canadian Entomologist},
  year={1979},
  volume={111},
  pages={1255 - 1262}
}
Abstract Monoterpene production, inner bark carbohydrate concentrations, and fir engraver attacks on grand fir were monitored for 3 years following Douglas-fir tussock moth defoliation. Monoterpenes were reduced for 2 years following defoliation. Defoliation caused a reduction in total sugars the first year following defoliation and a reduction in starch the second year. Total sugars and the previous year’s starch concentrations were positively correlated with monoterpene production. The trees… 
The Spruce Bark Beetle of Eurasia
The spruce bark beetle, Ips typographus Linnaeus (Coleoptera: Scolytidae), is the most destructive scolytid in the coniferous forests of the palaearctic region. In Europe, outbreaks may lead to the
ACCUMULATION OF MONOTERPENES AND ASSOCIATED VOLATILES FOLLOWING INOCULATION OF GRAND FIR WITH A FUNGUS TRANSMITTED BY THE FIR ENGRAVER, SCOLYTUS VENTRALIS (COLEOPTERA: SCOLYTIDAE)
TLDR
The extent of the defensive response was influenced by host age, disease, crown class, and artificial stress, and the proportions of limonene, myrcene, and Δ-3-carene, present in the monoterpene fraction increased.
Resistance of picea abies to ips typographus: tree response to monthly inoculations with ophiostoma polonicum, a beetle transmitted blue‐stain fungus
TLDR
Tree resistance was correlated with resinosis, and tree variables not correlated with resistance were DBH, annual ring width, periodic growth, vigor index, or phloem carbohydrate concentration.
Abundance of the fir engraver, Scolytus ventralis, and the Douglas-fir beetle, Dendroctonus pseudotsugae, following tree defoliation by the Douglas-fir tussock moth, Orgyia pseudotsugata
TLDR
Although beetle offspring emerging per dm 2 of bark surface was relatively low in defoliated trees, defoliation appeared to reduce host resistance which enabled beetles to successfully attack at lower densities, reducing intraspecific competition, and resulting in increased emergence of offspring/female parent.
Pruning enhances the susceptibility of Picea abies to infection by the bark beetle‐transmitted blue‐stain fungus, Ophiostoma polonicum
TLDR
The results lend support to the hypothesis that a reduction in the photosynthesis capacity increases host tree susceptibility to a beetle‐fungus attack, and that induced defence against infection depends on efficient translocation of assimi...
The fir engraver beetle in western states
TLDR
The fir engraver beetle, Scolytus ventralis LeConte, was first described from two specimens collected at Vancouver, Washington, but the species has been subsequently recorded throughout the western United States and British Columbia.
Interacting Selective Pressures in Conifer-Bark Beetle Systems: A Basis for Reciprocal Adaptations?
TLDR
The theory that a synchronous decline in resistance capacity among old trees in even-aged stands increases the likelihood of beetle epidemics and subsequent fires, thereby favoring reestablishment of lodgepole pine is examined.
Characteristics of subalpine fir susceptible to attack by western balsam bark beetle (Coleoptera: Scolytidae)
TLDR
The results of this study suggest that western balsam bark beetle mortality may be limited by the presence and distribution of susceptible hosts, and identifies a number of variables that could be used in a susceptibility and risk rating model for western balsem bark beetle.
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References

SHOWING 1-10 OF 14 REFERENCES
HOST RESISTANCE TO THE FIR ENGRAVER BEETLE, SCOLYTUS VENTRALIS (COLEOPTERA: SCOLYTIDAE): 2. REPELLENCY OF ABIES GRANDIS RESINS AND SOME MONOTERPENES
TLDR
It is hypothesized that α-pinene is the most important monoterpene in the insects’ perception of a resistant host.
Host resistance to the fir engraver beetle. 1. Monoterpene composition of Abies grandis pitch blisters and fungus-infected wounds
TLDR
The results suggest that conifers respond to fungus infection by producing monoterpenes which are more toxic, repellent, and (or) inhibitory to bark beetles and their associated fungi.
REACTIONS OF LODGEPOLE PINE TO ATTACK BY DENDROCTONUS PONDEROSAE HOPKINS AND BLUE STAIN FUNGI
The reaction in lodgepole pine in response to attack by Dendroctonus ponderosae and subsequent infection by blue stain fungi varies with the degree of resistance manifested by the tree. In both
Starch content of Douglas-fir defoliated by the tussock moth
Defoliation by the Douglas-fir tussock (Orgyiapseudosugata (McDunnough)) moth resulted in a reduction of total tree reserve energy, in the form of starch, proportional to the intensity of
Host resistance to the fir engraver beetle. 3. Lesion development and containment of infection by resistant Abies grandis inoculated with Trichosporium symbioticum
Development of lesions in resistant grand fir trees was observed from time of uninoculated- control injury and Trichosporium symbioticum inoculation to wound stabilization. Lesion development was s...
Derivation of the springtime starch increase in balsam fir (Abies balsamea)
TLDR
The bulk of the starch accumulating in conifers during the spring is derived from current photosynthesis, the rest being regenerated from carbohydrates produced during the previous year and stored overwinter.
Inhibition of growth of blue stain fungi by wood extractives
Resistance by lodgepole pine to invasion by blue stain fungi is effected by an initial flow of oleoresin followed by a gradual impregnation with resinous substances of the tissues adjacent to the
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