Effectiveness of sodium hypochlorite as a disinfestation treatment against genetically diverse strains of grape phylloxera Daktulosphaira vitifoliae Fitch (Hemiptera: Phylloxeridae)
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[1] Agriculture Victoria
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[2] Department of Economic Development, Jobs, Transport and Resources
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- Localización: Australian journal of grape and wine research, ISSN 1322-7130, Vol. 23, Nº 3, 2017, págs. 432-440
- Idioma: inglés
- Texto completo no disponible (Saber más ...)
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Resumen
Background and Aims Grape phylloxera, Daktulosphaira vitifoliae Fitch, causes damage to ungrafted European grapevines, Vitis vinifera L. Where distribution is limited such as in Australia and China, phylloxera is managed primarily through quarantine protocols. In Australia, there are 83 known phylloxera genetic strains, and studies have shown differences in susceptibility to some disinfestation treatments. First instar nymphs are the most dispersive stage and can be transferred from infested to healthy vineyards on footwear and hand held tools. The current disinfestation protocol recommends a footbath treatment for 30 s with 2% sodium hypochlorite (NaOCl) followed by a water rinse.
Methods and Results Survival of six endemic phylloxera genetic strains, G1, G4, G7, G19, G20 and G30, was determined by immersing first instars in 0, 2, 3 and 4% NaOCl for 30, 40 and 60 s followed by a 30 s water rinse. Although phylloxera survival was significantly reduced by increasing NaOCl concentration and treatment duration, none of the treatment combinations were 100% effective. By excluding the post-treatment water rinse, 100% mortality was achieved across all the six genetic strains using a treatment of 2% NaOCl for 60 s.
Conclusions Results from this study recommend a revised disinfestation treatment for footwear and hand held tools.
Significance of the Study It is important to consider differences in susceptibility to disinfestation treatments by phylloxera genetic strains.
