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Ecology
Luck, R.F., Div of Biol Control, Univ of California, Riverside, CA 92521, USA.
Podoler, H., Div of Biol Control, Univ of California, Riverside, CA 92521, USA.
Aphytis melinus (Hymenoptera: Aphelinidae) an ectoparasitoid of California red scale Aonidiella aurantii, replaced A. lingnanensis, another ectoparasitoid, in certain California citrus areas during the 1960s following the former's introduction in 1956-1957. Although both species attack a similar range of host sizes, A. melinus utilizes a smaller threshold scale size for the production of daughters. Size differences of scales within a citrus tree (largest scales occur on fruits, smallest on wood, and intermediate on leaves), seasonal variation in scale age structure, multivoltinism of the scale and parasitoid populations, seasonal availability of citrus fruits (the substrate that supports the largest scales), differences in the temperature tolerances of the two parasitoid species (A. linganensis is less tolerant), and differences in their vagility (A. melinus is more vagile), probably all favor A. melinus in competition with A. lingnanensis. The latter does not realize its fecundity advantage in female progeny when these species compete because A- melinus preempts California red scale before it grows into the size range preferred by A. lingnanensis. Collection records through show that A. melinus continued to extend its geographical range coastally in southern California through 1972.-Authors
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Competitive exclusion of Aphytis lingnanensis by A. melinus: potential role of host size.
66
Luck, R.F., Div of Biol Control, Univ of California, Riverside, CA 92521, USA.
Podoler, H., Div of Biol Control, Univ of California, Riverside, CA 92521, USA.
Competitive exclusion of Aphytis lingnanensis by A. melinus: potential role of host size.
Aphytis melinus (Hymenoptera: Aphelinidae) an ectoparasitoid of California red scale Aonidiella aurantii, replaced A. lingnanensis, another ectoparasitoid, in certain California citrus areas during the 1960s following the former's introduction in 1956-1957. Although both species attack a similar range of host sizes, A. melinus utilizes a smaller threshold scale size for the production of daughters. Size differences of scales within a citrus tree (largest scales occur on fruits, smallest on wood, and intermediate on leaves), seasonal variation in scale age structure, multivoltinism of the scale and parasitoid populations, seasonal availability of citrus fruits (the substrate that supports the largest scales), differences in the temperature tolerances of the two parasitoid species (A. linganensis is less tolerant), and differences in their vagility (A. melinus is more vagile), probably all favor A. melinus in competition with A. lingnanensis. The latter does not realize its fecundity advantage in female progeny when these species compete because A- melinus preempts California red scale before it grows into the size range preferred by A. lingnanensis. Collection records through show that A. melinus continued to extend its geographical range coastally in southern California through 1972.-Authors
Scientific Publication
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