The last couple of weeks the vineyards have received an important amount of precipitation, have been exposed to high humidity levels and warm conditions, including through the night. These conditions are ideal for the proliferation of Downy Mildew through the vineyard, keeping in mind that some varieties will be more susceptible than others. Symptoms may appear within 4-6 days in favourable conditions (optimum temperature is 18 – 25⁰ Celsius). Therefore, it’s necessary to scout the vineyard frequently these days, ideally at least 3 times per week, and keep a fungicide rotation to avoid developing resistance.
