Incidence de la consommation des aiguilles de clones de Pin sylvestre défavorables à Diprion pini L. (Hym., Diprionidae) sur le développement de Thaumetopoea pityocampa Schiff. (Lep., Thaumetopoeidae) et de Graellsia isabellae Graëlls (Lep., Attacidae)
Auteurs : Géri (Claude), Auger (Michel) et Goussard (Francis)
Année de publication : 1994
Publication : Journal of Applied Entomology (= Zeitschrift für Angewandte Entomologie)
Volume :
117
Fascicule : 3
Pagination : 248-256
Résumé :
This paper presents the first results of feeding bioassays performed with Scots pine clones, more or less favourable to the sawfly Diprion pini L., on the caterpillars of two lepidopteran species: Thaumetopoea pityocampa Schiff., the pine Processionary, an important defoliator of mediterraneans forest and Graellsia isabellae Graells, a rare species, protected in France. Such studies are important in regard to breeding forest plants resistant to insect pests. A first experimentation was concerned with survival and development rate of Processionary larvae during the fall of 1992, on Scots pine clones in natural conditions. A second experiment dealed with some biological characteristics of G. isabellae (survival, sex-ratio, development rate, chrysalid weight). Caterpillars derived from a rearing population were fed with cut twigs from the hatching to cocoon spinning, in an outside shelter. Foliage consumption of the clones unfavourable to D. pini affected both species. T. pityocampa mortality increased and its larval development slowed down. G. isabellae larval development slowed down and its chrysalid weight decreased. Survival rates of the protected species were not changed