Results of the single release efficacy of the predatory mite Neoseiulus californicus (McGregor) against the two-spotted spider mite (Tetranychus urticae Koch) on a hop plantation

Vidrih, Matej (author), Turnšek, Anja (author), Rak Cizej, Magda (author), Bohinc, Tanja (author), Trdan, Stanislav (author)

In 2015, we studied the efficiency of the predatory mite Neoseiulus californicus (McGregor) for suppression of the two-spotted spider mite Tetranychus urticae 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 N. californicus 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 T. urticae 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 N. californicus 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 N. californicus.

• Language: English
• Keywords: two-spotted spider mite, Humulus lupulus, predatory mite, biological control
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2021
• Number of pages: 12 str.
• Numbering: Vol. 11, iss. 1, art. 118
• PID: 20.500.12556/RUL-134807
• UDC: 632
• ISSN on article: 2076-3417
• DOI: 10.3390/app11010118
• COBISS.SI-ID: 44502275
• Publication date in RUL: 02.02.2022

Record is a part of a journal

• Title: Applied sciences
• Shortened title: Appl. sci.
• Publisher: MDPI
• ISSN: 2076-3417
• COBISS.SI-ID: 522979353

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
• Licensing start date: 01.01.2021

Secondary language

• Language: Slovenian
• Keywords: biotično varstvo, naravni sovražniki, predatorske pršice, Neoseiulus californicus, škodljivci rastlin, Tetranychus urticae, hmelj

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P4-0013
• Name: Hortikultura

• Funder: Other - Other funder or multiple funders
• Funding programme: Ministry of Agriculture, Forestry and Food, Administration of The Republic of Slovenia for Food Safety, Veterinary and Plant Protection, Professional Tasks from the Field of Plant Protection