Abstract
Under conditions of laboratory bioassay in which aphids were infected by total immersion in spore suspensions, blastospores of the entomopathogenic fungus,Verticillium lecanii (Zimm.)Viégas, were twice as pathogenic as conidia for the aphid,Macrosiphoniella sanborni Gill., on a numerical basis. By comparison, on a live-spore volume basis blastospores, being larger, were only ×0.6 as pathogenic. Blastospores were also, numerically, more pathogenic when healthy aphids were infected from spore-covered leaf discs in the laboratory. LC50s of the 2 assay methods differed by more than × 100. In glasshouses, the 2 spore-types achieved similar levels of control ofM. sanborni.
Résumé
Les essais réalisés au laboratoire par immersion complète des puceronsMacrosiphoniella sanborni Gill. dans des suspensions de spores deVerticillium lecanii (Zimm.)Viégas montrent que les blastospores sont 2 fois plus pathogènes que les conidies; cependant, lorsqu'on considère le volume de matériel vivant, la pathogénie des blastospores est seulement multipliée par un facteur de 0,6. Les blastospores sont plus pathogènes que les conidies quand les pucerons sont infectés au laboratoire à partir de disques foliaires recouverts de spores. Les DL50 des 2 méthodes diffèrent d'un facteur supérieur à 100. En serre, les 2 types de spores permettent le contrôle deM. sanborni à des niveaux similaires.
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Hall, R.A. Pathogenicity ofVerticillium lecani conidia and blastospores against the aphid,Macrosiphoniella sanborni . Entomophaga 24, 191–198 (1979). https://doi.org/10.1007/BF02375133
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DOI: https://doi.org/10.1007/BF02375133