| Autor: |
Karg, Gerhard, Sauer, Arne |
| Zdroj: |
Journal of Chemical Ecology; February 1997, Vol. 23 Issue: 2 p487-501, 15p |
| Abstrakt: |
Spatial and temporal distributions and relative concentrations of the pheromone of the European grape vine moth Lobesia botrana(Lepidoptera: Tortricidae) were measured in mating disruption trials with electroantennograms. Measurements were carried out over several years during the flight season of the two generations of this pest insect. In three consecutive years significantly higher mean relative pheromone concentrations were measured in summer during the flight of the second generation of L. botranathan in spring during the flight of the first generation (P< 0.001). The relative pheromone concentrations in 1989 reached a maximum between late July and early August, when the highest mean daily temperatures were registered. In addition to the differences in mean relative pheromone concentrations, the spatial and temporal distributions of the pheromone differed significantly between spring and summer. EAG recordings taken in summer showed high, uniform pheromone concentrations in the treated plots, whereas in spring strong temporal and spatial fluctuations were recorded. In a vineyard defoliated by a hailstorm, the mean relative pheromone concentrations measured in summer were not significantly different from those measured in spring (P> 0.05), but were significantly lower than those of a nearby intact vineyard (P< 0.001). The results provided additional evidence that foliage is an important parameter determining mean pheromone concentrations and temporal and spatial distribution of pheromone in mating disruption trials. |
| Databáze: |
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