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Biology of Longitarsus flavicornis (Stephens) (Coleoptera: Chrysomelidae) and its effectiveness in controlling ragwort (Senecio jacobaea L.) in Tasmania
journal contribution
posted on 2023-05-16, 19:04 authored by Ireson, J, Friend, DA, Holloway, RJ, Paterson, SMonitoring established field populations of an introduced French strain of Longitarsus flavicornis in Tasmania in 1985/86 showed that newlyâ€emerged adults were first recorded in early December, with peak emergences occurring in January. Oviposition commenced in January, first instar larvae were recorded from midâ€February and the first pupae were collected in early November. Laboratory studies suggested that eggs laid in the field in late autumn may not hatch until the following spring. Evidence is presented that prevailing weather conditions may have initially restricted establishment and spread of L. flavicornis in some areas. Ragwort density was reduced at 2 monitored sites where L. flavicornis was established. Ragwort populations, which initially consisted of plants with both single and multiâ€crowns, and shoots from a range of size and development classes, were replaced by populations dominated by plants with single crowns and small rosettes. These observations indicate that L. flavicornis can be effective in controlling ragwort. Copyright © 1991, Wiley Blackwell. All rights reserved
History
Publication title
Journal of the Australian Entomological SocietyVolume
30Pagination
129-141ISSN
0004-9050Department/School
Tasmanian Institute of Agriculture (TIA)Publisher
Wiley-Blackwell Publishing AsiaPlace of publication
AustraliaRepository Status
- Restricted