Abstract
In laboratory assays of Dacus dorsalis Hendel populations that had been cultured on host fruit in the laboratory for one generation, we found that ovipositing females discriminated strongly against kumquat fruit infested by young conspecific larvae or young larvae of Ceratitis capitata (Wiedemann) but not against uninfested kumquat fruit whose surface was treated with fly-deposited substances such as kumquat juice, feces, or host marking pheromone. Discrimination against larval-infested fruit could allow D. dorsalis to avoid possible detrimental effects of intraspecific as well as intergeneric competition among larvae for limited host fruit resources.
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