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Effects of the biological nematicide, DiTera , on hatching of Globodera rostochiensis and G. pallida

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For more content, see Nematologica.

DiTera® (Valent Biosciences Corp.), a novel biological nematicide, did not stimulate hatch of Globodera rostochiensis or G. pallida, but exposing cysts to 1 and 10% DiTera® in distilled water for 5 weeks irreversibly prevented hatch when the cysts were transferred to the natural hatching stimulus potato root diffusate (PRD). Similarly, exposing cysts of both species for 5 weeks to 1 and 10% DiTera® dissolved in PRD resulted in a significant inhibition of hatch which was irreversible when cysts were transferred to PRD alone. Tests on free eggs indicated that, when mixed with PRD, DiTera® prevented eggshell permeability change, normally caused by PRD as an initial phase in the hatching process, in a majority of eggs. This indication that DiTera® interfered with the specific hatching mechanism of G. rostochiensis was reinforced by the lack of hatch inhibition of Meloidogyne incognita. The potential for DiTera® as a novel control agent to prevent hatch of G. rostochiensis or G. pallida in the field is discussed.

Das neuartige biologische Nematizid DiTera® (Valent Biosciences Corp.) regte das Schlüpfen von Globodera rostochiensis und G. pallida nicht an. Wenn Zysten 5 Wochen lang in 1 und 10%igen Lösungen von DiTera® in destilliertem Wasser gehalten wurden, war das Schlüpfen auch nach Überführung in das natürliche Schlüpfmedium Kartoffelablaufwasser (PRD) irreversibel blockiert. In ähnlicher Weise trat eine signifikante Schlüpfhemmung auf, wenn die Zysten für 5 Wochen in 1 und 10%igen Lösungen von DiTera® in PDR waren. Diese Schlüpfhemmung war irreversibel, auch wenn die Zysten anschliessend in reines PRD gebracht wurden. Versuche mit freien Eiern zeigten, dass DiTera® in Mischung mit PRD den Wechsel in der Durchlässigkeit der Eischale verhindert, der normalerweise bei den meisten Eiern als Anfangsphase des Schlüpfvorganges durch PRD verursacht wird. Dieser Hinweis darauf, dass DiTera® den spezifischen Schlüpfmechanismus von G. rostochiensis stört, wurde dadurch bestätigt, dass das Schlüpfen von Meloidogyne incognita nicht gestört wurde. Die Verwendungdsmöglichkeiten von DiTera® als neuartiges Bekämpfungsmittel zur Verhinderung des Schlüpfens von G. rostochiesis oder G. pallida im Freiland werden diskutiert.

Affiliations: 1: Entomology and Nematology Department, IACR-Rothamsted, Harpenden, Hertfordshire AL5 2JQ, UK; 2: Valent Biosciences Corp., 6131 RFD Oakwood Road, Long Grove, IL 60047, USA


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