n African Entomology - Development of (Berg) (Lepidoptera : Pyralidae) on six North American species




(Berg) (Lepidoptera : Pyralidae) has been used as a biological control agent of several species around the world and is widely assumed to be a generalist on host plants within the genus . The recent arrival and spread of on the North American mainland has raised concerns for the native species of that are being utilized as hosts by the moth. To confirm that is a threat to a wide range of species in North America, the host range of the moths was scrutinized in South Africa, where larval development could be monitored on several species under natural conditions. Development was monitored on L. Miller, Salm-Dyke, Englm, (Haworth) de Candolle, Haworth and DC. Larval survival, egg to pupation, was highest on (79.2%) followed by (57.5 %), (55.0 %), (29.2 %), (24.2 %) and (16.7 %). Male and female pupal mass was highest, and duration of development shortest on . In adult multi-choice oviposition trials, females laid significantly more egg sticks on than on the other species. Although is the preferred host for in South Africa, the moth is nevertheless able to utilize several other species of as hosts.


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