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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

Feeding and oviposition punctures for weevils given a choice between resistant and susceptible host tree genotypes. The average number of feeding and oviposition holes (± 1SE) counted on the leader, interwhorl, and over the entire tree for the resistant and the susceptible genotypes over 23 days of continuous weevil exposure when the weevils were given a choice between tree genotypes.
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insects-01-00003-f006: Feeding and oviposition punctures for weevils given a choice between resistant and susceptible host tree genotypes. The average number of feeding and oviposition holes (± 1SE) counted on the leader, interwhorl, and over the entire tree for the resistant and the susceptible genotypes over 23 days of continuous weevil exposure when the weevils were given a choice between tree genotypes.

Mentions: Weevil feeding patterns and reproductive success were also different between resistant and susceptible host trees in the choice tests with female and male weevils combined. Generally, weevils fed less on the resistant trees as assessed by the number of feeding holes (F1, 4 = 7.084, p = 0.056 over the whole tree) (Figure 6). Successful reproduction, as assessed by development of larvae, occurred on the susceptible trees (average ± 1SE: 8.7 ± 0.9 larvae on the leader and 2.3 ± 1.4 larvae on the interwhorl), but no larvae were found on the resistant trees.


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

Robert JA, Bohlmann J - Insects (2010)

Feeding and oviposition punctures for weevils given a choice between resistant and susceptible host tree genotypes. The average number of feeding and oviposition holes (± 1SE) counted on the leader, interwhorl, and over the entire tree for the resistant and the susceptible genotypes over 23 days of continuous weevil exposure when the weevils were given a choice between tree genotypes.
© Copyright Policy
Related In: Results  -  Collection

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

insects-01-00003-f006: Feeding and oviposition punctures for weevils given a choice between resistant and susceptible host tree genotypes. The average number of feeding and oviposition holes (± 1SE) counted on the leader, interwhorl, and over the entire tree for the resistant and the susceptible genotypes over 23 days of continuous weevil exposure when the weevils were given a choice between tree genotypes.
Mentions: Weevil feeding patterns and reproductive success were also different between resistant and susceptible host trees in the choice tests with female and male weevils combined. Generally, weevils fed less on the resistant trees as assessed by the number of feeding holes (F1, 4 = 7.084, p = 0.056 over the whole tree) (Figure 6). Successful reproduction, as assessed by development of larvae, occurred on the susceptible trees (average ± 1SE: 8.7 ± 0.9 larvae on the leader and 2.3 ± 1.4 larvae on the interwhorl), but no larvae were found on the resistant trees.

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