Canadian Forest Service Publications

Age-related changes in the calling behaviour and the attractiveness of obliquebanded leafroller virgin females, Choristoneura rosaceana, under different constant and fluctuating temperature conditions. 1992. Delisle, J. Entomologia Experimentalis et Applicata 63(1): 55-62.

Year: 1992

Available from: Laurentian Forestry Centre

Catalog ID: 16457

Language: English

CFS Availability: Not available through the CFS (click for more information).


Virgin females of the tortricid Choristoneura rosaceana initiated calling in the first scotophase following emergence at both 15 and 20°C constant temperature under LD 16:8. As females aged, the onset of calling occurred much earlier, and the time spent calling increased significantly at both temperatures. For a given age, the onset of calling occurred significantly earlier at 15 than at 20°C, but the duration of calling did not vary with temperature. Similar results were obtained under warm and cold thermocycles that simulated natural conditions prevailing during the summer and autumn flight periods. A comparison of the attractiveness of females at 0, 3 and 5 days old in a deciduous forest in Quebec showed that the attractiveness of 0-day-old females relative to that of 3-day-old females did not vary between flights. However, compared with day-5 females, the relative attractiveness of 0- and 3-day-old females was greater in the summer than in the autumn flight periods. The potential adaptive value of these changes for seasonal mating success is discussed.



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