Results of the Single Release Efficacy of the Predatory Mite <i>Neoseiulus californicus</i> (McGregor) against the Two-Spotted Spider Mite (<i>Tetranychus urticae</i> Koch) on a Hop Plantation
In 2015, we studied the efficiency of the predatory mite <i>Neoseiulus californicus</i> (McGregor) for suppression of the two-spotted spider mite <i>Tetranychus urticae</i> in a field experiment at a hop plantation. We randomly arranged four treatments in a three-block experi...
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MDPI AG
2020-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/1/118 |
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| author | Matej Vidrih Anja Turnšek Magda Rak Cizej Tanja Bohinc Stanislav Trdan |
| author_facet | Matej Vidrih Anja Turnšek Magda Rak Cizej Tanja Bohinc Stanislav Trdan |
| author_sort | Matej Vidrih |
| collection | DOAJ |
| description | In 2015, we studied the efficiency of the predatory mite <i>Neoseiulus californicus</i> (McGregor) for suppression of the two-spotted spider mite <i>Tetranychus urticae</i> in a field experiment at a hop plantation. We randomly arranged four treatments in a three-block experiment. Fungicides were used in all treatments; insecticides were used in all treatments except the predatory mite treatment and acaricides were used in only two treatments. A single inundative release of the mite <i>N. californicus</i> was carried out on 4 July. On four different dates (10 June, 17 July, 29 July and 9 August), we counted the eggs and the mobile stages (larvae, nymphs and adults) of the two-spotted spider mite in all four treatments. In the treatment with the predatory mite, we established the fewest eggs and mobile stages of <i>T. urticae</i> 14 days after the release of the predator. The selected acaricides in our research acted in a primarily ovicidal manner, but we did not detect satisfactory effects on the mobile stages of the two-spotted spider mite. This result suggests the emergence of resistance of two-spotted spider mites to the acaricides hexythiazox and abamectin. Our research established comparable effects of the predatory mite <i>N. californicus</i> and acaricides, and further improvement of the efficiency would require release of the natural enemy into a hop plantation in mid-June, followed by a second release three weeks later. The costs of acaricide use in our experiment were from 12.7-fold (two sprayings of hexythiazox, and a single spraying with abamectin) to 17.8-fold (single treatments of hexythiazox and abamectin) lower than those of a single release of the biological control agent in question. The results of our study represent a starting point for future research, which could achieve satisfactory results in suppressing two-spotted spider mites on a hop plantation by repeated use of the predatory mite <i>N. californicus</i>. |
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| last_indexed | 2024-03-10T13:47:07Z |
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| spelling | doaj.art-1002ebb264b94916a16c5e25db0253cb2023-11-21T02:29:00ZengMDPI AGApplied Sciences2076-34172020-12-0111111810.3390/app11010118Results of the Single Release Efficacy of the Predatory Mite <i>Neoseiulus californicus</i> (McGregor) against the Two-Spotted Spider Mite (<i>Tetranychus urticae</i> Koch) on a Hop PlantationMatej Vidrih0Anja Turnšek1Magda Rak Cizej2Tanja Bohinc3Stanislav Trdan4Department of Agronomy, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, SloveniaDepartment of Agronomy, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, SloveniaSlovenian Institute of Hop Research and Brewing, Cesta Žalskega Tabora 2, SI-3310 Žalec, SloveniaDepartment of Agronomy, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, SloveniaDepartment of Agronomy, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, SloveniaIn 2015, we studied the efficiency of the predatory mite <i>Neoseiulus californicus</i> (McGregor) for suppression of the two-spotted spider mite <i>Tetranychus urticae</i> in a field experiment at a hop plantation. We randomly arranged four treatments in a three-block experiment. Fungicides were used in all treatments; insecticides were used in all treatments except the predatory mite treatment and acaricides were used in only two treatments. A single inundative release of the mite <i>N. californicus</i> was carried out on 4 July. On four different dates (10 June, 17 July, 29 July and 9 August), we counted the eggs and the mobile stages (larvae, nymphs and adults) of the two-spotted spider mite in all four treatments. In the treatment with the predatory mite, we established the fewest eggs and mobile stages of <i>T. urticae</i> 14 days after the release of the predator. The selected acaricides in our research acted in a primarily ovicidal manner, but we did not detect satisfactory effects on the mobile stages of the two-spotted spider mite. This result suggests the emergence of resistance of two-spotted spider mites to the acaricides hexythiazox and abamectin. Our research established comparable effects of the predatory mite <i>N. californicus</i> and acaricides, and further improvement of the efficiency would require release of the natural enemy into a hop plantation in mid-June, followed by a second release three weeks later. The costs of acaricide use in our experiment were from 12.7-fold (two sprayings of hexythiazox, and a single spraying with abamectin) to 17.8-fold (single treatments of hexythiazox and abamectin) lower than those of a single release of the biological control agent in question. The results of our study represent a starting point for future research, which could achieve satisfactory results in suppressing two-spotted spider mites on a hop plantation by repeated use of the predatory mite <i>N. californicus</i>.https://www.mdpi.com/2076-3417/11/1/118two-spotted spider mite<i>Humulus lupulus</i>predatory mitebiological control |
| spellingShingle | Matej Vidrih Anja Turnšek Magda Rak Cizej Tanja Bohinc Stanislav Trdan Results of the Single Release Efficacy of the Predatory Mite <i>Neoseiulus californicus</i> (McGregor) against the Two-Spotted Spider Mite (<i>Tetranychus urticae</i> Koch) on a Hop Plantation Applied Sciences two-spotted spider mite <i>Humulus lupulus</i> predatory mite biological control |
| title | Results of the Single Release Efficacy of the Predatory Mite <i>Neoseiulus californicus</i> (McGregor) against the Two-Spotted Spider Mite (<i>Tetranychus urticae</i> Koch) on a Hop Plantation |
| title_full | Results of the Single Release Efficacy of the Predatory Mite <i>Neoseiulus californicus</i> (McGregor) against the Two-Spotted Spider Mite (<i>Tetranychus urticae</i> Koch) on a Hop Plantation |
| title_fullStr | Results of the Single Release Efficacy of the Predatory Mite <i>Neoseiulus californicus</i> (McGregor) against the Two-Spotted Spider Mite (<i>Tetranychus urticae</i> Koch) on a Hop Plantation |
| title_full_unstemmed | Results of the Single Release Efficacy of the Predatory Mite <i>Neoseiulus californicus</i> (McGregor) against the Two-Spotted Spider Mite (<i>Tetranychus urticae</i> Koch) on a Hop Plantation |
| title_short | Results of the Single Release Efficacy of the Predatory Mite <i>Neoseiulus californicus</i> (McGregor) against the Two-Spotted Spider Mite (<i>Tetranychus urticae</i> Koch) on a Hop Plantation |
| title_sort | results of the single release efficacy of the predatory mite i neoseiulus californicus i mcgregor against the two spotted spider mite i tetranychus urticae i koch on a hop plantation |
| topic | two-spotted spider mite <i>Humulus lupulus</i> predatory mite biological control |
| url | https://www.mdpi.com/2076-3417/11/1/118 |
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