Robert Jeanne A, Bohlmann Jörg
Michael Smith Laboratories, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
Insects. 2010 Aug 19;1(1):3-19. doi: 10.3390/insects1010003.
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.
白松象甲（Pissodes strobi, Peck.）是北美太平洋西北部的一种本土森林害虫，会攻击云杉（Picea spp.）和松树（Pinus spp.）的树种。年轻的西加云杉[Picea sitchensis (Bong.) Carr.]树尤其容易受到象甲的攻击。在不列颠哥伦比亚省沿海的高象甲危害地区，已发现了自然存在的西加云杉抗性群体。在本研究中，我们比较了象甲对一种极具抗性的西加云杉基因型（H898）和一种高度敏感基因型（Q903）的行为、生理和繁殖反应。实验依赖大量三年生的克隆繁殖树木，因此仅限于两种对比鲜明的西加云杉基因型。当接触抗性树木时，雄性和雌性象甲在寄主选择和交配过程中都会受到阻碍，雌性象甲的卵巢发育延迟或减少，并且抗性树木上的象甲无法成功繁殖。
