Evaluation of the efficiency of alternative products to control downy mildew and anthracnose in grapevine, cultivar Niagara Branca

Abstract

The aim of this study was to evaluate the efficiency of alternative products to control downy mildew
and anthracnose in grapevine. An experiment was carried out at Epagri/Urussanga Experiment Station, in Santa Catarina State, Brazil, from September 2004 to February 2005. The following treatments were tested: Fitophos
K®, Phosphorus K®, Ecolife-40®, Bordeaux mixture, extract of the alga Ulva fasciata and control. All treatments reduced leaf downy mildew severity compared to non-treated plants (24,7%). However, the highest disease
reduction was reached by spraying Ulva-extract, which did not differ significantly from both Bordeaux mixture and Ecolife-40® treatments. Plants treated with alga extract had lower anthracnose incidence in grape bunches
(15%) than the control (42,5%), but did not differ from those treated with Phosphorus K®, Bordeaux mixture and Fitophos K®.