Parasitism byAphidius ervi (Hym.: Aphidiidae): Preference for pea aphid and blue alfalfa aphid (Hom.: Aphididae) and competition withA. Smithi |
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| Authors: | B H P Bueno A P Gutierrez P Ruggle |
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| Institution: | (1) Departamento de Fitossanidade, Escola Superior de Agricultura de Lavras, Cx. Postal 37, 37200 Lavras, MG, Brasil;(2) Division of Biological Control, University of California at Berkeley, 1050 San Pablo Ave., 94706 Albany, Ca., USA |
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| Abstract: | The pea aphidAcyrthosiphon pisum (Harris) and the blue alfalfa aphidA. kondoi Shinji are pests of alfalfaMedicago sativa L. worldwide. The parasitoidAphidium ervi Haliday attacks both species andA. smithi is host specific to pea aphid Experiments were conducted to determine the preference ofA. ervi forA. pisum andA. kondoi at three densities of hosts using the percentages of parasitism and superparasitism, and the distribution of eggs among hosts as criteria. Also examined was the outcome of competition between the two parasitoids when exposed to the same hosts. A. ervi attacks moreA. pisum when provided alone (no choice test) and when provided together in equal numbers withA. kondoi (choice test). There was no significant difference in the number of progeny produced by either parasitoid when a female of each species was introduced simultaneously into the same test unit containingA. pisum hosts. The effects of the pathogenPandora neoaphidis on this competition is reviewed. |
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| Keywords: | parasitism interspecitic competition host preference aphids |
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