Aleurocanthus woglumi [Hom.: Aleyrodidae] andEncarsia opulenta [Hym.: Encyrtidae]: Density-dependent relationship between adult parasite aggregation and mortality of the host |
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| Authors: | K R Summy F E Gilstrap W G Hart |
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| Institution: | (1) Subtropical Crop Insects Research, ARS, USDA, 78596 Weslaco, Texas;(2) Present address: Department of Entomology, Texas A&M University, 77843 College Station, TX |
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| Abstract: | Field and laboratory choice tests in which searching adultEncarsia opulenta Silvestri were exposed to variable densities of citrus blackfly,Aleurocanthus woglumi Ashby, indicated the following: (1) a direct functional relationship between adult parasite aggregation and host density, resulting in (2) a direct density-dependent mortality ofA. woglumi within a single generation timespan. The implications of such nonrandom searching patterns byE. opulenta on stability of the host-parasite interaction on Texas citrus are discussed. |
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| Keywords: | Citrus Aleurocanthus woglumi Aleyrodidae Encarsia opulenta Encyrtidae density dependence aggregation mortality factor |
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