Endophyteinfected meadow fescue and loline alkaloids affect Argentine stem weevil larvae
| Autor: | B.A. Tapper, A.J. Popay, C. Podmore |
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| Rok vydání: | 2009 |
| Předmět: | |
| Zdroj: | New Zealand Plant Protection. 62:19-27 |
| ISSN: | 1179-352X 1175-9003 |
| DOI: | 10.30843/nzpp.2009.62.4801 |
| Popis: | In a meadow fescue plant assay, a lower percentage of tillers on endophyte-infected (E+) than endophyte-free (E–) plants on which eggs had been laid were damaged by Argentine stem weevil (ASW) larvae. There were indications of endophyte-mediated toxicity to young larvae. The percentage of damaged tillers on E– and E+ plants without ASW eggs was similar when they were planted alongside a plant with eggs, but severity of damage was less on E+ plants. In an artificial diet experiment, eggs took 2-3 days longer to hatch on an alkaloid-free diet than on diets containing either of two loline alkaloids produced by E+ meadow fescue. Growth and development of larvae was reduced by up to 36% at two higher concentrations of N-formyl loline (NFL) relative to the lowest concentration, and to a lesser extent by N-acetyl norloline. Larval survival declined with increasing concentrations of both alkaloids, with the highest mortality occurring at the two higher concentrations of NFL. |
| Databáze: | OpenAIRE |
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