Insecta, Lepidoptera, Pyralidae .
Description, Biology, Life Cycle, Damage, Common Names, Images
- Limited to Oleaceae, this pyralid lives on olive and ash (Fraxinus excelsior).
- First-generation adults appear in April and May, second-generation adults in August-September.
- Eggs are laid singly or in groups of 2 to 5 in crevices of the trunk. Embryonic development lasts 2 weeks.
- Larval growth lasts 2 to 2.5 months for the spring generation and about 6 months for the overwintering generation. The caterpillar is xylophagous, penetrating into the wood just after hatching. Sawdust in the galleries in the trunk and branches, mixed with silken threads, is rejected to the outside.
- pupation lasts 4 weeks for first generation individuals (in March) and 3 weeks for those of the second generation (in July).
- Normaly 2 generations a year, 3 if the summer generation has time to be completed before the onset of cold weather.
During the winter, larvae, sheltered in their galleries, continue their development, but at a slower rate.
The galleries excavated by the caterpillar at the base of the trunk and the forks of branches block the circulation of sap, killing the extremities of the tree. Certain parts of the foliage dry out.
5 to 6 caterpillars suffice to cause the death of the infested host. The pyralid is a primary pest , i.e. capable of developing to the detriment of a healthy, vigorous tree.
This pest is of importance only in certain regions.
The presence of the pest and the activity of the caterpillar are signalled by the frass and sawdust bound by silken threads, rejected from the galleries.
DE: Ölbaumzünsler ES: Piral del olivo FR: Pyrale des troncs de l'olivier IT: Tignola rodiscorza dell'olivo e del frassino PT: Pirale da oliveira GB: Olive pyralid moth
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