Biological activity of essential oils against Thrips tabaci Lind. and Kakothrips robustus (Uzel) in field crops
Abstract
The scientific objective of the proposed project is the evaluation of the role of biologically active essential oils of plants within the Lamiaceae family and their volatile compounds in the chemical ecology of Thrips tabaci Lind. and Kakothrips robustus (Uzel). To achieve the project aim, the following bioassays will be conducted in the laboratory: field collected populations of both thrips species will be are reared. Key data on the allelochemical activity of selected essential oils and their volatile compounds at different concentrations against both thrips species will be obtained in Y-tube olfactometer bioassays. In flight cage experiments the influence of these volatile allelochemicals on host plant selection and settling behaviour will be investigated by comparing the number of thrips that land on an untreated host plant or a plant treated with volatile allelochemicals. Leaf disc bioassays will be conducted to examine the impact of the selected volatiles on reproduction rate and oviposition preference of adult thrips females. The number of larvae hatched from the leaf discs sprayed by means of a Potter Spray Tower or from untreated leaf discs will provide a measure of the acceptability of the plant as a reproductive host. In another experimental series using treated and untreated leaf discs, insecticidal effects of essential oils and their volatile compounds to adults and second instar larvae of both thrips species will be examined. As there are no efficient non-chemical control measurements available against thrips pests in field crops at present, these studies will provide a new approach to the development of repellents, deterrents and/or natural insecticides for use in both biological pest management strategies and Integrated Pest Management.
keywords Thrips tabaci Kakothrips robustus volatile plant allelochemicals repellents Lamiaceae
Publikationen
Influence of plant volatiles on feeding damage caused by the onion thrips Thrips tabaci
Autoren: Koschier, E.H., Sedy, K. Jahr: 2002
Journal articles
Die Wirkung pflanzlicher Allomone gegen schädliche Thysanopteren
Autoren: Koschier, E., Sedy, K. Jahr: 2002
Conference & Workshop proceedings, paper, abstract
Effects of plant volatiles on feeding and oviposition of Thrips tabaci Lindeman
Autoren: Koschier E., Sedy, K. Jahr: 2003
Conference & Workshop proceedings, paper, abstract
Thrips responses to plant odors
Autoren: De Kogel, W.J., Koschier, E. Jahr: 2003
Conference & Workshop proceedings, paper, abstract
Bioactivity of carvacrol and thymol against Frankliniella occidentalis and Thrips tabaci
Autoren: Sedy, K.A., Koschier, E.H. Jahr: 2003
Journal articles
Labiate essential oils affecting host selection and acceptance of Thrips tabaci Lindeman
Autoren: Koschier, E.H., Sedy, K.A. Jahr: 2003
Journal articles
Project staff
Elisabeth Helene Koschier
Ao.Univ.Prof. Dipl.-Ing. Dr.nat.techn. Elisabeth Helene Koschier
elisabeth.koschier@boku.ac.at
Tel: +43 1 47654-95303
Project Leader
01.04.2000 - 30.09.2002