In this section:
Fungicides
Management of new fungicides for the control of powdery mildew and other grape diseases
GWRDC funded, 1999 – 2002. Contact Dr Trevor Wicks
Final report to GWRDC, August 2002 (PDF 1MB)
This project was undertaken to develop and evaluate management strategies for the efficient use of the new fungicide group, the strobilurins, for the control of powdery mildew, downy mildew and Botrytis bunch rot of grapes. Laboratory, greenhouse and field experiments were carried out to determine the protectant and curative limitation of the strobilurin fungicides Amistar and Flint. These studies showed that they were most effective when applied before infection, and while they were effective against both powdery and downy mildew they were less effective on Botrytis bunch rot. Field trials over 3 seasons evaluating various sprays regimes were focused mainly on powdery mildew and these showed that excellent control of powdery mildew was obtained when 4 to 6 sprays per season were used and included either wettable sulphur or DMI before and after 2 to 3 applications of a strobilurin around flowering. Where Flint and Amistar were directly compared Flint was the most effective fungicide for controlling powdery mildew whereas Amistar was more effective than Flint in controlling downy mildew.
Strategic Use of Sulphur in IPM Programs for Grapevines
Project leader DR Bob Emmett, DPI Victoria. Contact Dr Trevor Wicks.
Final report to GWRDC, December 2003. (PDF 2.3 MB)
Laboratory and field studies re-examined the efficacy of sulphur for powdery mildew and mite control, clarifying the effects of factors influencing the performance of sulphur to develop strategies that make optimum use of sulphur in IPM programs while minimising the potential for residues in grape products.
