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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

Female and male choice of resistant versus susceptible host tree genotypes. Weevil distribution on susceptible (solid lines) and resistant (dotted lines) trees in choice experiments. (A) The percentage of female weevils when mixed with male weevils; (B) male weevils when mixed with female weevils; and (C) male weevils only, observed on the susceptible and on the resistant genotypes at each sampling day.
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insects-01-00003-f005: Female and male choice of resistant versus susceptible host tree genotypes. Weevil distribution on susceptible (solid lines) and resistant (dotted lines) trees in choice experiments. (A) The percentage of female weevils when mixed with male weevils; (B) male weevils when mixed with female weevils; and (C) male weevils only, observed on the susceptible and on the resistant genotypes at each sampling day.

Mentions: Over the entire timecourse of the choice experiment, a higher number of female weevils were observed on the susceptible tree genotype (Figure 5A). Over 70% of the females had already moved to a susceptible tree by day two and this proportion remained fairly constant until the end of the experiment at day 23. Movement of male weevils reflected a pattern similar to that of the females for the first half of the time course until day 14 (Figure 5B). In contrast to the female weevils, after day 14 the males showed a random distribution on susceptible and resistant trees. We tested whether the presence of females was influencing male choice of susceptible versus resistant host trees. When males were caged without females (Figure 5C), the males again showed an initial preference for susceptible trees until day 15, then showed a more even distribution between resistant and susceptible 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)

Female and male choice of resistant versus susceptible host tree genotypes. Weevil distribution on susceptible (solid lines) and resistant (dotted lines) trees in choice experiments. (A) The percentage of female weevils when mixed with male weevils; (B) male weevils when mixed with female weevils; and (C) male weevils only, observed on the susceptible and on the resistant genotypes at each sampling day.
© Copyright Policy
Related In: Results  -  Collection

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

insects-01-00003-f005: Female and male choice of resistant versus susceptible host tree genotypes. Weevil distribution on susceptible (solid lines) and resistant (dotted lines) trees in choice experiments. (A) The percentage of female weevils when mixed with male weevils; (B) male weevils when mixed with female weevils; and (C) male weevils only, observed on the susceptible and on the resistant genotypes at each sampling day.
Mentions: Over the entire timecourse of the choice experiment, a higher number of female weevils were observed on the susceptible tree genotype (Figure 5A). Over 70% of the females had already moved to a susceptible tree by day two and this proportion remained fairly constant until the end of the experiment at day 23. Movement of male weevils reflected a pattern similar to that of the females for the first half of the time course until day 14 (Figure 5B). In contrast to the female weevils, after day 14 the males showed a random distribution on susceptible and resistant trees. We tested whether the presence of females was influencing male choice of susceptible versus resistant host trees. When males were caged without females (Figure 5C), the males again showed an initial preference for susceptible trees until day 15, then showed a more even distribution between resistant and susceptible 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