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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 number and area of cortical and induced resin ducts for weevil-attacked and control trees for resistant versus susceptible tree genotypes. (A) The average number of constitutive cortical resin ducts; and (B) induced traumatic resin ducts per millimeter stem circumference (± 1SE); (C) The average area per duct (± 1SE) of cortical resin ducts; and (D) induced traumatic resin ducts for resistant and susceptible Sitka spruce genotypes.
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insects-01-00003-f001: The number and area of cortical and induced resin ducts for weevil-attacked and control trees for resistant versus susceptible tree genotypes. (A) The average number of constitutive cortical resin ducts; and (B) induced traumatic resin ducts per millimeter stem circumference (± 1SE); (C) The average area per duct (± 1SE) of cortical resin ducts; and (D) induced traumatic resin ducts for resistant and susceptible Sitka spruce genotypes.

Mentions: Prior to using the clonally propagated resistant and susceptible trees in experiments to study weevil behavior, physiology and reproductive success, we assessed defense related traits. Resistant and susceptible trees showed substantial differences in their defense response of weevil induced traumatic resin duct formation (Figure 1B and 1D). The resistant genotype showed a significantly larger number of traumatic resin ducts at day 22 of weevil feeding relative to untreated control trees (tree genotype: F1, 7 = 102.8, p < 0.001; treatment: F1, 7 = 197.1, p < 0.001), whereas the susceptible genotype showed almost no traumatic resin duct formation. The number and area of constitutive cortical resin ducts were not significantly different between the two genotypes (Figure 1A and 1C).


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 number and area of cortical and induced resin ducts for weevil-attacked and control trees for resistant versus susceptible tree genotypes. (A) The average number of constitutive cortical resin ducts; and (B) induced traumatic resin ducts per millimeter stem circumference (± 1SE); (C) The average area per duct (± 1SE) of cortical resin ducts; and (D) induced traumatic resin ducts for resistant and susceptible Sitka spruce genotypes.
© Copyright Policy
Related In: Results  -  Collection

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

insects-01-00003-f001: The number and area of cortical and induced resin ducts for weevil-attacked and control trees for resistant versus susceptible tree genotypes. (A) The average number of constitutive cortical resin ducts; and (B) induced traumatic resin ducts per millimeter stem circumference (± 1SE); (C) The average area per duct (± 1SE) of cortical resin ducts; and (D) induced traumatic resin ducts for resistant and susceptible Sitka spruce genotypes.
Mentions: Prior to using the clonally propagated resistant and susceptible trees in experiments to study weevil behavior, physiology and reproductive success, we assessed defense related traits. Resistant and susceptible trees showed substantial differences in their defense response of weevil induced traumatic resin duct formation (Figure 1B and 1D). The resistant genotype showed a significantly larger number of traumatic resin ducts at day 22 of weevil feeding relative to untreated control trees (tree genotype: F1, 7 = 102.8, p < 0.001; treatment: F1, 7 = 197.1, p < 0.001), whereas the susceptible genotype showed almost no traumatic resin duct formation. The number and area of constitutive cortical resin ducts were not significantly different between the two genotypes (Figure 1A and 1C).

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