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The occurrence of Entomophthorales on the carrot fly [Psila rosae F.] in the field during two successive seasons

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Abstract

Three species of Entomophthorales were found on adult carrot flies (Psila rosae F.) during two successive seasons:Entomophthora muscae (C.) Fres.,Condiobolus apiculatus (Thax.) Remaud. & Keller andErynia sp.E. muscae was by far the most common species and caused epizootics in one carrot fly population up to 3 times per year. Flies cuaght in the hedge showed a higher infection level than flies caught in the field close to the hedge. Flies caught 200 m away from the hedge showed the lowest infection level. Apparently the hedge was the site of infection, since carrot flies, killed byE. muscae, were found there attached to the underside of the leaves. Flies caught on yellow sticky traps developed only to a limited extend symptoms and gave little information about the fungus infection levels.

Résumé

Trois espèces d'Entomophthorales ont été trouvées sur des Mouches de la Carotte adultes durant 2 saisons successives:Entomophthora muscae (C.) Fres,Conidiobolus apiculatus (Thax.) Remaud. & Keller etErynia sp.E. muscae était de loin l'espèce la plus commune causant des épizooties dans une population de mouche de la carotte plus de 3 fois par an. Les mouches capturées dans la haie manifestaient un niveau d'infection plus élevé que celles capturées dans le champ à proximité de la haie. Les mouches capturées à 200 mètres de la haie manifestaient le niveau d'infection le plus bas. Apparemment, la haie était le foyer d'infection car les mouches de la carotte tuées parE. muscae s'y trouvaient attachées à la face inférieure des feuilles. Les mouches capturées sur les pièges jaunes développaient uniquement des symptômes limités et donnaient peu d'information sur les niveaux d'infection dus au champignon.

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  1. Department of Zoology, Royal Veterinary and Agricultural University, Bülowsvej 13, DK-1870 Frb. C., (Copenhagen), Denmark

    J. Eilenberg & H. Philipsen

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  1. J. Eilenberg
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  2. H. Philipsen
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Eilenberg, J., Philipsen, H. The occurrence of Entomophthorales on the carrot fly [Psila rosae F.] in the field during two successive seasons. Entomophaga 33, 135–144 (1988). https://doi.org/10.1007/BF02372648

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  • DOI: https://doi.org/10.1007/BF02372648

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