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Article

Cycle biologique et importance appliquée de l'espèce Yponomeuta rorellus Hübner dans les ripisylves à Salix alba de la région Midi-Pyrénées

Auteurs : Torossian (Claude) et Roques (Lydie)


Année de publication : 1989
Publication : Acta œcologica. Œcologia applicata
Volume : 10
Fascicule : 1
Pagination : 47-63


Résumé :

The bioecology of the small ermine moth (Yponomeuta rorellus Hubner) is studied in this paper. Present results can be summarized as follows: The taxonomic position of the species Yponomeuta rorellus Hubner in the padellus-complex is defined and discussed (PAG, 1959; FRIESE, 1960; WIEGAND, 1962...). The biological cycle of Yponomeuta rorellus Hubner is explained, this caterpillar was outbreaking for 5 years in the riparian forests of the Midi-Pyrenees area. The first larval instar showed a large range of behaviors. After hatching, the L (1) overwintered under their ooplaca until the next spring. Then they lived as endophytic (leaf-miners) and then, as exophytic (leaf-cutters). A strict synchronisation between L (1) emerging through the ooplaca and unfolding leaves was observed; that seemed to be an essential condition to the invasive process success. The auxilary complex (parasitic insects and bacteria) was also of great importance and seemed to be able to regulate the gradation process. In the future, we wish to carry out studies on the silk production activity. Silk muff measurements moreover, seem of great interest for a synthetical approach of the difficult problem of the outbreak quantification