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- W2135269898 abstract "Several plant essential oils were tested for their effect on behaviour and mortality of M. euphorbiae. Olfactory and contact experiments were performed to study these effects. We found that host plant and formulation of the different oils have a strong influence on repellence and mortality of the aphids. Three out of ten tested oils show potential for control of this aphid in greenhouses and field crops. The potato aphid (Macrosiphum euphorbiae) is an economically important pest in many arable crops (Moeller 1973). It is an important vector of plant viruses (Cerato et al. 1994) and causes growth reduction of plants. Although biological control of M. euphorbiae in greenhouses is successful, reduction of high populations with non-persistent chemicals is sometimes necessary before introduction of parasitoids or when the circumstances for biological control are unfavourable. Virus transmission at low aphid populations in certain crops is also limiting the possibilities for biological control. The reduced number of available insecticides in The Netherlands and the need for alternatives to control insect pests with no or limited effects on non- target organisms has led to this study on the effectiveness of plant essential oils. Plant essential oils constitute a rich source of bioactive chemicals and are commonly used as fragrances and flavouring agents in food. Several essential oils have been tested against different insect species, including aphids (Masatoshi 1999a,b). Many of these studies show that prolonged contact and/or periods of exposure to high concentrations in the vapour phase (fumigation) are needed to kill the insects. Repelling insects from their host plants by spraying plant essential oils is even more difficult since they have to mask the host-plant odour for prolonged periods. Product formulation of these essential oils is critical for efficacy in time, phytotoxicity of the treated plants as well as prevention of washing off. In this study we looked at different aspects related to efficacy of repelling and killing M. euphorbiae with a number of plant essential oils in different formulations in a laboratory study. Further, we tested the effect of plant species and treatment with a formulated essential oil in a windtunnel test on repellence efficacy." @default.
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- W2135269898 date "2004-01-01" @default.
- W2135269898 modified "2023-09-28" @default.
- W2135269898 title "Repellence and toxicity of plant essential oils to the potato aphid, Macrosiphum euphorbiae" @default.
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