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Behavioral and Reproductive Response of White Pine Weevil (Pissodes strobi) to Resistant and Susceptible Sitka Spruce (Picea sitchensis).

Robert JA, Bohlmann J - Insects (2010)

Bottom Line: Young Sitka spruce [Picea sitchensis (Bong.) Carr.] trees are particularly susceptible to weevil attack.Pockets of naturally occurring Sitka spruce resistance have been identified in high weevil hazard areas in coastal British Columbia.When exposed to resistant trees, both male and female weevils were deterred during host selection and mating, females showed delayed or reduced ovary development, and successful reproduction of weevils was prevented on resistant trees.

View Article: PubMed Central - PubMed

Affiliation: Michael Smith Laboratories, University of British Columbia, Vancouver, BC V6T 1Z4, Canada. jrobert@unbc.ca.

ABSTRACT
White pine weevil (Pissodes strobi, Peck.) is a native forest insect pest in the Pacific Northwest of North America that attacks species of spruce (Picea spp.) and pine (Pinus spp.). Young Sitka spruce [Picea sitchensis (Bong.) Carr.] trees are particularly susceptible to weevil attack. Pockets of naturally occurring Sitka spruce resistance have been identified in high weevil hazard areas in coastal British Columbia. In this study, we characterize behavioral, physiological and reproductive responses of weevils to an extremely resistant Sitka spruce genotype (H898) in comparison to a highly susceptible genotype (Q903). The experiments relied on a large number of three-year-old clonally propagated trees and were therefore restricted to two contrasting Sitka spruce genotypes. When exposed to resistant trees, both male and female weevils were deterred during host selection and mating, females showed delayed or reduced ovary development, and successful reproduction of weevils was prevented on resistant trees.

No MeSH data available.


Related in: MedlinePlus

The resistant and susceptible monoterpene profiles in response to weevil feeding. The average amount of monoterpene measured (µg/g dry weight ± 1SE) on each sampling day for resistant (A-D) and susceptible (E-H) trees. Asterisk indicates a significant difference between treatment and control (p < 0.05). nd = not detected).
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insects-01-00003-f002: The resistant and susceptible monoterpene profiles in response to weevil feeding. The average amount of monoterpene measured (µg/g dry weight ± 1SE) on each sampling day for resistant (A-D) and susceptible (E-H) trees. Asterisk indicates a significant difference between treatment and control (p < 0.05). nd = not detected).

Mentions: The monoterpene profiles over 22 days of continuous weevil feeding were variable but largely unchanged in either resistant or susceptible trees for the compounds we measured, specifically (+)-α-pinene, (−)-limonene, (+)-sabinene and (+)-3-carene (Figure 2). Most of the compounds did not change significantly with continuous weevil feeding in either genotype, but (+)-3-carene decreased significantly at day 15 (F1, 3 = 30.756, p < 0.012) and day 22 (F1, 4 = 35.524, p < 0.004) in the resistant genotype exposed to weevil feeding. Importantly, the monoterpene (+)-3-carene was not detected in Q903 consistent with recent observations of (+)-3-carene as an indicator for Sitka spruce resistance against white pine weevil [6].


Behavioral and Reproductive Response of White Pine Weevil (Pissodes strobi) to Resistant and Susceptible Sitka Spruce (Picea sitchensis).

Robert JA, Bohlmann J - Insects (2010)

The resistant and susceptible monoterpene profiles in response to weevil feeding. The average amount of monoterpene measured (µg/g dry weight ± 1SE) on each sampling day for resistant (A-D) and susceptible (E-H) trees. Asterisk indicates a significant difference between treatment and control (p < 0.05). nd = not detected).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4553465&req=5

insects-01-00003-f002: The resistant and susceptible monoterpene profiles in response to weevil feeding. The average amount of monoterpene measured (µg/g dry weight ± 1SE) on each sampling day for resistant (A-D) and susceptible (E-H) trees. Asterisk indicates a significant difference between treatment and control (p < 0.05). nd = not detected).
Mentions: The monoterpene profiles over 22 days of continuous weevil feeding were variable but largely unchanged in either resistant or susceptible trees for the compounds we measured, specifically (+)-α-pinene, (−)-limonene, (+)-sabinene and (+)-3-carene (Figure 2). Most of the compounds did not change significantly with continuous weevil feeding in either genotype, but (+)-3-carene decreased significantly at day 15 (F1, 3 = 30.756, p < 0.012) and day 22 (F1, 4 = 35.524, p < 0.004) in the resistant genotype exposed to weevil feeding. Importantly, the monoterpene (+)-3-carene was not detected in Q903 consistent with recent observations of (+)-3-carene as an indicator for Sitka spruce resistance against white pine weevil [6].

Bottom Line: Young Sitka spruce [Picea sitchensis (Bong.) Carr.] trees are particularly susceptible to weevil attack.Pockets of naturally occurring Sitka spruce resistance have been identified in high weevil hazard areas in coastal British Columbia.When exposed to resistant trees, both male and female weevils were deterred during host selection and mating, females showed delayed or reduced ovary development, and successful reproduction of weevils was prevented on resistant trees.

View Article: PubMed Central - PubMed

Affiliation: Michael Smith Laboratories, University of British Columbia, Vancouver, BC V6T 1Z4, Canada. jrobert@unbc.ca.

ABSTRACT
White pine weevil (Pissodes strobi, Peck.) is a native forest insect pest in the Pacific Northwest of North America that attacks species of spruce (Picea spp.) and pine (Pinus spp.). Young Sitka spruce [Picea sitchensis (Bong.) Carr.] trees are particularly susceptible to weevil attack. Pockets of naturally occurring Sitka spruce resistance have been identified in high weevil hazard areas in coastal British Columbia. In this study, we characterize behavioral, physiological and reproductive responses of weevils to an extremely resistant Sitka spruce genotype (H898) in comparison to a highly susceptible genotype (Q903). The experiments relied on a large number of three-year-old clonally propagated trees and were therefore restricted to two contrasting Sitka spruce genotypes. When exposed to resistant trees, both male and female weevils were deterred during host selection and mating, females showed delayed or reduced ovary development, and successful reproduction of weevils was prevented on resistant trees.

No MeSH data available.


Related in: MedlinePlus