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Control of the Colorado potato beetle (Leptinotarsa decemlineata [Say]) on potato under field conditions: a comparison of the efficacy of foliar application of two strains of Steinernema feltiae (Filipjev) and spraying with thiametoxam

Bekämpfung des Kartoffelkäfers (Leptinotarsa decemlineata [Say]) an Kartoffeln im Feld: ein Vergleich der Wirksamkeit von Blattbehandlungen mit zwei Stämmen von Steinernema feltiae (Filipjev) mit Thiametoxam

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Abstract

The efficacy of entomopathogenic nematodes in controlling Leptinotarsa decemlineata on potato was tested in a field experiment. A Slovenian strain of Steinernema feltiae (B30) was used with the commercial product Entonem and the insecticide thiametoxam. The application of the nematodes and thiametoxam was repeated twice. In the second application half of the first dose (250.000 infective juveniles m–2) was used. Observing the population dynamics of the pest, it has become apparent that entomopathogenic nematodes significantly decreased the number of larvae, while no effect on their eggs and adults was confirmed. In controlling larvae in both years thiametoxam showed the best results in general, meanwhile treatments with EPNs showed no differences. In both years the highest yield was obtained when thiametoxam was used (2008: 24.38 t ha–1; 2009: 21.60 t ha–1), while the lowest yield was in the control treatment (2008: 7.65 t ha–1; 2009: 6.94 t ha–1). Different treatments of EPNs showed differences, and yields ranged from 16.44 (S. feltiae B30 low concentration) to 17.81 t ha–1 (Entonem high concentration) in 2008, and between 11.06 (S. feltiae B30 low concentration) and 14.88 t ha–1 (Entonem high concentration) in 2009. Both strains of entomopathogenic nematodes showed sufficient activity when controlling larvae, but unfortunately the high price of these biological agents at the moment makes it difficult for their broader implementation in the systems of potato production.

Zusammenfassung

Die Wirksamkeit entomopathogener Nematoden bezüglich der Bekämpfung des Kartoffelkäfers (Leptinotarsa decemlineata) wurde im Feld an Kartoffeln untersucht. Ein slowenischer Stamm von Steinernema feltiae (B30) und das kommerzielle Produkt Entonem wurden mit dem Insektizid Thiametoxam in zweifacher Wiederholung verglichen. Bei der zweiten Anwendung wurde mit 250.000 Nematodenlarven m–2 die halbe Dosis der ersten ausgebracht. Populationsdynamische Beobachtungen am Schadtier ergaben, dass die entomopathogenen Nematoden zwar die Anzahl der Käferlarven signifikant verminderten, die Anzahl der Eier und Adulten aber nicht beeinflussten. Gegenüber den Käferlarven zeigte Thiametoxam in beiden Jahren generell die stärkste Wirkung, während sich die Wirkung der Varianten mit entomopathogenen Nematoden nicht voneinander unterschied. Die höchsten Kartoffelerträge wurden in beiden Versuchsjahren mit Thiametoxam erzielt (2008: 24,38 t ha–1; 2009: 21,60 t ha–1), während die geringsten Mengen in der Kontrolle geerntet wurden (2008: 7,65 t ha–1; 2009: 6,94 t ha–1). Die verschiedenen Behandlungen mit Nematoden wirkten unterschiedlich; die Erträge variierten zwischen 16,44 (S. feltiae B30 in geringer Dosierung) und 17,81 t ha–1 (Entonem in hoher Dosierung) im Jahr 2008, sowie zwischen 11,06 (S. feltiae B30 in geringer Dosierung) und 14,88 t ha–1 (Entonem in hoher Dosierung) im Jahr 2009. Beide untersuchten Nematodenstämme zeigten gegenüber den Larven des Kartoffelkäfers ausreichende Wirksamkeit, aber ihr derzeitig hoher Preis beeinträchtigt noch ihre verbreitetere Anwendung im Kartoffelbau.

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Laznik, Ž., Tóth, T., Lakatos, T. et al. Control of the Colorado potato beetle (Leptinotarsa decemlineata [Say]) on potato under field conditions: a comparison of the efficacy of foliar application of two strains of Steinernema feltiae (Filipjev) and spraying with thiametoxam. J Plant Dis Prot 117, 129–135 (2010). https://doi.org/10.1007/BF03356348

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