Oecologia (2001) 127, 444-453

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Nadir Erbilgin and Kenneth F. Raffa (2001)
Modulation of predator attraction to pheromones of two prey species by stereochemistry of plant volatiles
Oecologia 127 (3), 444-453
Abstract: Predators and parasitoids are known to exploit both plant volatiles and herbivore pheromones to locate their insect prey. However, the interaction of these chemical cues in prey location, and the implications of multiple sources of chemical cues to predator feeding breadth and tracking of herbivore counter adaptations, are less well understood. We evaluated the responses of three coleopteran predators to the pheromones and plant signals associated with two species of common bark beetle prey. Thanasimus dubius, Platysoma cylindrica, and Corticeus parallelus feed exclusively on the fauna within trees colonized by bark beetles. The predominant bark beetles in conifer forests of central Wisconsin are Ips pini and Ips grandicollis. The aggregation pheromone of Wisconsin I. pini contains ipsdienol, which occurs as (+) and (-) enantiomers, and lanierone, and the pheromone of I. grandicollis contains ipsenol. The major hosts of these bark beetles are Pinus resinosa, Pinus banksiana, and Pinus strobus, which contain monoterpenes as their predominant phytochemical volatiles. Monoterpenes by themselves did not attract predators. However, some monoterpenes significantly affected predator attraction to aggregation pheromones. Myrcene, and to a lesser extent carene, reduced predator attraction. By contrast, pinene consistently enhanced attraction by all three predators to the pheromones of their Ips prey. However, the predators' responses were modulated by the stereochemistry of pinene, and these responses differed when confronted with the different pheromones of the two prey species.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Nadir Erbilgin, Kenneth F. Raffa

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
environment - cropping system/rotation
Research topic(s) for beneficials or antagonists:
environment/habitat manipulation

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Ips pini Pine (Pinus) U.S.A. (mid N)
Ips grandicollis Pine (Pinus) U.S.A. (mid N)
Thanasimus dubius (predator) Ips pini Pine (Pinus) U.S.A. (mid N)
Thanasimus dubius (predator) Ips grandicollis Pine (Pinus) U.S.A. (mid N)
Platysoma cylindrica (predator) Ips pini Pine (Pinus) U.S.A. (mid N)
Platysoma cylindrica (predator) Ips grandicollis Pine (Pinus) U.S.A. (mid N)
Corticeus parallelus (predator) Ips pini Pine (Pinus) U.S.A. (mid N)
Corticeus parallelus (predator) Ips grandicollis Pine (Pinus) U.S.A. (mid N)