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Oulema melanopus (L.) (Coleoptera: Chrysomelidae) adults are susceptible to entomopathogenic nematodes (Rhabditida) attack: results from a laboratory study

Adulte Stadien des Rothalsigen Getreidehähnchens Oulema melanopus (L.) (Coleoptera: Chrysomelidae) sind anfällig gegenüber entomopathogenen Nematoden (Rhabditida): Ergebnisse einer Laborstudie

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Abstract

Three species of entomopathogenic nematodes from Slovenia (Steinernema feltiae B30, S. carpocapsae C101, and Heterorhabditis bacteriophora D54) and commercial product Entonem (S. feltiae as active ingredient) were tested under laboratory conditions for their ability to kill adult cereal leaf beetles (Oulema melanopus). The nematode strains were tested at 250, 500, 1000, and 2000 infective juveniles/adult and at 15, 20, and 25°C. The numbers of beetles killed were recorded 2, 4, and 6 days after treatment. S. carpocapsae strain C101 was the most effective and showed itself to be a good alternative to chemical insecticides (at 2 DAT 100% mortality was recorded), and appears to have the highest potential for controlling overwintered cereal leaf beetles under field conditions. The temperature had the greatest influence on the efficacy of the entomopathogenic nematodes; both S. feltiae strains proved to work better at the lowest temperature, however the strain H. bacteriophora D54 had its best efficacy at the highest temperature. S. feltiae and S. carpocapsae have been efficient at lower suspension concentrations, which enables their more economical usage against the cereal leaf beetle in integrated agriculture practice in the future.

Zusammenfassung

Drei entomopathogene Nematodenstämme aus Slowenien (Steinernema feltiae B30, S. carpocapsae C101 und Heterorhabditis bacteriophora D54) sowie das S. feltiae enthaltende kommerzielle Produkt Entonem wurden im Labor hinsichtlich ihrer mortalen Wirkung auf adulte Stadien des Rothalsigen Getreidehähnchens (Oulema melanopus) überprüft. Die Nematoden wurden in Dichten von 250, 500, 100 und 2000 Infektionslarven pro adultem Käfer bei 15, 20 und 25°C getestet. Die Anzahl getöteter Getreidehähnchen wurde 2, 4 und Tage nach der Behandlung bestimmt. S. carpocapsae C101 war mit einer 100%igen Mortalität nach 2 Tagen der wirksamste Nematodenstamm und stellt damit eine praktikable Alternative zu chemischen Insektiziden dar. Er scheint das höchste Potential der untersuchten Stämme zur Bekämpfung überwinternder Getreidehähnchen im Feld zu besitzen. Die Temperatur besaß den größten Einfluss auf die Wirksamkeit der entomopathogenen Nematoden; die Wirkung der beiden Stämme von S. feltiae war bei 15°C, die von H. bacteriophora D54 dagegen bei 25°C am höchsten. S. feltiae und S. carpocapsae wirkten auch bei geringeren und damit kostengünstigeren Suspensionsdichten, was ihre zukünftigen Anwendungs-chancen gegenüber Getreidehähnchen im integrierten Pflanzenbau erhöhen könnte.

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Laznik, Ž., Tóth, T., Lakatos, T. et al. Oulema melanopus (L.) (Coleoptera: Chrysomelidae) adults are susceptible to entomopathogenic nematodes (Rhabditida) attack: results from a laboratory study. J Plant Dis Prot 117, 30–32 (2010). https://doi.org/10.1007/BF03356330

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