University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Barbara Egger
(2011):
Die Wirkung von Salicylsäure- und Jasmonsäurederivaten auf Larven von Frankliniella occidentalis Pergande.
Master / Diploma Thesis - Institut für Pflanzenschutz (IPS),
BOKU-Universität für Bodenkultur,
pp 65.
UB BOKU
obvsg
- Abstract:
- The objective of this study was to investigate effects of four volatile secondary plant substances (methyl jasmonate, cis-jasmone, methyl salicylate and salicylaldehyde) on the behaviour of the second instar (L2) of Frankliniella occidentalis Pergande (Thysanoptera: Thripidae). The test substances were applied to bean leaf discs at 1% concentration. In order to determine their toxicity, second instars of F. occidentalis were sprayed directly with the test substances. None proved to be toxic to F. occidentalis L2. In choice experiments, F. occidentalis L2 avoided significantly to settle, i.e. to stay in contact on plant material treated with either jasmonate. The salicylate treatments did not result in significant responses. The damage on the leaf discs by the feeding activity was examined after 24 hours in no-choice experiments. The application of cis-jasmone led to a significant reduction of damaged leaf area. A one hour behavioural study on leaf discs treated with methyl jasmonate or cis-jasmone showed a change in behaviour: the F. occidentalis larvae showed tendentially reduced movements and reduced feeding activity. Their deterrent and behaviour manipulating effects on F. occidentalis larvae make methyl jasmonate and cis-jasmone interesting subjects for further studies. The two substances could probably be used in integrated pest management strategies.
- Beurteilende(r): Koschier Elisabeth Helene