1- Vine Downy, (Plasmopara viticola Berl. And Toni) Vine diseases.

2- What is Vine Mildew?

Vine mildew is one of the best known and most serious vine diseases in viticulture, since if the environmental conditions are favorable, it can attack all the green organs of the vine plant, being able to lose an important part of the production from grape.

It is a fungus and its activity begins in spring, when its development conditions are favorable.

The click of the fungus will be repeated over and over again depending on the humidity, until in autumn, the fungus will enter the resting phase again.

The following  conditions are ideal for fungus activity :

· Shoot length of 10 cm or more.
· Fall of a rain of 10 mm minimum.
· Average temperature above 10ºC.

3- Sinonimias del mildiu en vid

Grapevine downy mildew is also known as: mildew, mildew, fog, blight.

4- Influence of weather conditions for the development of vine mildew.

Climatic factors have a total influence on the development of this fungus.

There is a rule to remember which are the favorable conditions for the development of the disease, known by the three 10, and that is, that the disease develops when the 3 * 10 are fulfilled:

  1. Buds on the vine equal to or greater than 10 cm.
  2. Precipitation greater than 10 mm or 10 L / m2.
  3. Average temperature above 10ºC.

If we are in the period of development of the disease, and these three conditions occur, preventive treatment must be carried out .

This disease appears in regions of hot and humid climate during the vegetative growth period.

The conditions of propagation of this fungus are high relative humidity and temperature.

The conditions of propagation of this fungus are high relative humidity and temperature.

With relative humidity greater than 75% and temperatures between 12 and 30ºC, the daily development is greater than 25%.

5- Symptoms and damage of mildew in vineyard.

· In sheets.

The typical oil stains can be distinguished on the upper surface, corresponding to a whitish fluff on the underside.

Downy mildew is an endoparasitic fungus that gets into the spaces between cells in all parts of the vineyard.

It winters without showing activity in the strain, plant debris, in the soil, in the form of an egg known as an oospore . At the arrival of spring and when the right conditions are met, its activity begins.

The stages of the mildew cycle are as follows:

  1. Contamination : it is the first stage that the oospores finish the winter lethargy and germinate.
  2. Incubation : it spreads intercellularly, the first typical oil spots appearing on the underside of the leaves.
  3. Sporulation : in this phase the sexual multiplication of cells occurs during almost the entire vegetative period of the vine.
  4. Propagation : final stage in which zoospores spread through secondary contaminations to perpetuate the species. Pag through rain or air breezes is common

9- Active substances against vine mildew : 

Vineyard phytosanitary products registered for mildew. The Registry may vary as it is periodically updated and new products are always coming out.

The most used are the following:


Dr. Sofia Seccombe

My name is Dr. Sofia Seccombe, and in this small section, I want to tell you who I am and why I started this project. I don't want to bore you, but I consider that it is an important part of godlywine. It serves as an exercise in transparency so that the person who reads the articles can be sure that the information is reliable.

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