Integrated Management of Two-spotted Spider Mite Tetranychus urticae on Hops using Hop ß-acids as an Antifeedant Together with the Predatory Mite Phytoseiulus persimilis |
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Authors: | G Jones C A M Campbell J Hardie J A Pickett B J Pye L J Wadhams |
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Institution: |
a Horticulture Research International Department of Biological Sciences East Malling, West Malling ME19 6BJ Kent.
b Aphid Biology Group Department of Biological Sciences, Imperial College at Silwood Park Ascot SL5 7PY Berkshire.
c Rothamsted Research Department of Biological Sciences Harpenden AL5 2JQ Hertfordshire. |
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Abstract: | The effects on population development of two-spotted spider mite Tetranychus urticae by sprays of hop β-acids, a repellent and antifeedant of T. urticae, together with an inoculative release of the predatory mite Phytoseiulus persimilis were compared on tall and dwarf hops. The combination of the semiochemical with the predator was more effective than either factor singly on both hop types. The highest numbers of spider mites and their eggs were recorded on untreated plots. The sprays of β-acids slowed the rate of increase of the pest and contributed more to the effect of the combined treatment early in the season when the predator was establishing itself on the crop. By harvest time, the predator was the more influential of the two factors. |
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Keywords: | Hops Ipm Antifeedant Phytoseiulus Persimilis Tetranychus Urticae |
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