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Effect of pheromone trap position in large and small trees and in the open field on the catch of codling moth, Cydia pomonella, males


, : Effect of pheromone trap position in large and small trees and in the open field on the catch of codling moth, Cydia pomonella, males. Mitteilungen der Schweizerischen Entomologischen Gesellschaft 68(1-2): 69-78

Traps with the pheromone of codling moth, Cydia pomonella (L.), were positioned in the canopy of host and non-host plants as well as in the open field on poles placed in a distance of 10-40 m. Traps in the canopy of trees and shrubs yielded in general much more moths than traps in the open field. Another experiment was carried out in an apple orchard, in which groups of large spindle trees (3.5 m) alternated with groups of small trees (1.8 m). Traps in large trees caught much more moths than traps positioned at the same level in or near small trees. Codling moth adults approach tree silhouettes of host and non-host plants by visual orientation. They refrain from leaving the canopy of trees. The difference in trap catch in trees and in the open field seems to be mainly due to this mode of behavior.

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