Abstract
Parasitism ofCoccinella septempunctata L. byPerilitus coccinellae (Schrank) varies seasonally with an 11% overall rate among beetles overwintering in the Hackensack Meadowlands, which is less than that reported in Europe.P. coccinellae may parasitizeC. 7-punctata twice yearly. FemaleC. 7-punctata were parasitized more heavily than males. Although parasitism byP. coccinellae varied significantly among host species, it was not significantly different among 3 habitats. High host density favored greater parasitism in 3 coccinellid species. Rearing for parasite cocoons, consistently showed lower parasitism rates than did dissection for parasitized larvae. Overwintering survival of cagedC. 7-punctata near Stillwater, OK, varied between years averaging 53,5%. Infection of overwinteringC. 7-punctata byBeauveria bassiana (Balsamo) was 1,6% in 1978–1979.
Résumé
Le parasitisme deCoccinella 7-punctata L. parPerilitus coccinellae (Schrank) varie selon les saisons avec un taux maximum de 11% chez les coccinelles hivernantes dans la région de Hackensak Meadowlands, ce qui est moindre qu'en Europe.P. coccinellae peut parasiterC. 7-punctata 2 fois par an. Les femelles deC. 7-punctata sont davantage parasitées que les mâles. Le parasitisme parP. coccinellae varie de façon significative selon les espèces hôtes mais ne diffère pas dans les 3 habitats étudiés. Une forte densité en hôtes favorise le parasitisme chez 3 espèces de coccinelles. L'élevage pour obtenir les cocons des parasites donne des taux de parasitisme nettement inférieurs à ceux observés par dissection des larves parasitées. La survie pendant l'hiver en cages deC. 7-punctata, près de Stillwater, OK, est variable selon les années et en moyenne de 53,5%. L'infection parBeauveria bassiana (Balsamo) chez lesC. 7-punctata hivernantes fut de 1,6% en 1978–1979.
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Journal article number 4018 of the Oklahoma Agricultural Experiment Station. A jointly supported effort on behalf of USDA-SEA, Beneficial Insects Research Laboratory, Newark, DE and the Oklahoma Agricultural Experimental Station.
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Cartwright, B., Eikenbary, R.D. & Angalet, G.W. Parasitism byPerilitus coccinellae [Hym.: Braconidae] of indigenous coccinellid hosts and the introducedCoccinella septempunctata [Col.: Coccinellidae], with notes on winter mortality. Entomophaga 27, 237–243 (1982). https://doi.org/10.1007/BF02374808
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DOI: https://doi.org/10.1007/BF02374808