Downy mildew of the vine

Downy mildew of the vine

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Downy mildew of the vine: life cycle of the disease and how to cure it. Symptoms and remedies to eliminate vine blight.

Theredowny mildewis defined thediseasemore serious than can attack thelives. It appeared in Europe in 1878, coming from North America. Since then, thedowny mildewit has become the most studied disease because, in viticulture, it causes the greatest number of damage. The greatest damage occurs with attacks of downy mildew in the period between the pre-flowering and full fruit set phases. For preventive purposes, baking soda in agriculture is used to prevent the spread of late blight.

Downy mildew of the vine:life cycle and symptoms

here is the life cycle of downy mildew of the vine: downy mildew overwinters in the form of "Oospora" in the fallen leaves in the ground in autumn. Yeah, thedowny mildewit is a fungal disease that can persist in the soil and its development strictly depends on rain, humidity and temperature.

In spring, with rising temperatures and rains, the oospores they germinate and produce filaments that end in a macroconidium.

Macroconidium is the structure that gives rise to zoospores.

The zoospores are equipped with two flagella which cause them to fluctuate in an aqueous environment. The zoospores can thus reach the stoma of the leaves where, fixing themselves, they will give rise to a first infection: primary infection.

Secondly, the zoospores produced between late spring and early summer, germinate and form new filaments of the fungus that are able to infect the various green organs of the lives.

In this phase, a few days of incubation at the right temperature are enough to make those appear on the vine leaves yellow spots.

Between symptomsbest known of thedowny mildewwe point out precisely theyellow spots on the leavescalled "oil stains".

Subsequently, on the lower page of the leaf, in correspondence with the spot, the conidiophore branches appear which at their ends have a multitude of conidia with the characteristic white mold. The presence of white mold under the leaf is also among thesymptomsuseful for recognize the downy mildew of the vine.

From the conidia, new zoospores are formed (already described above). Once again the zoospores will give rise to infections. The second line of infection is called, in this case, secondary infectionlinked to the samelife cycle of downy mildew.

The infectious process just described will be repeated several times throughout the summer. If the atmospheric conditions are favorable (with rain, persistent dampness) thedowny mildew of the vineit will be more difficult to contain.

Conversely, with adverse weather conditions for the downy mildew fungus the extent of infections will be reduced. The adverse conditions for the vine downy mildew fungusthey see high temperatures with little rainfall and dry weather.

Downy mildew of the vine, symptoms

Among the emblematic symptoms for to recognizetheredowny mildew of the vinewe told you aboutyellow spots on the leavesand white mold on the underside of the leaves.

There are other symptoms that are detected when the infection of thevine downy mildew fungusit has now reached advanced stages.

If the berries begin to blacken, with an early drying of the grapes, thedowny mildewit is no longer curable. The treatment, in this case, must be carried out to prevent the spread of attacks on plants and plant organs that are still healthy.

Downy mildew of the vine:how to cure it

Inbiological agriculturethe only method to prevent and treatdowny mildew of the vineconsists of a copper-based treatment.

In conventional agriculture, copper-based treatments are used and are recommended in the phase of enlargement of the berries for preventive purposes.

Copper has an excellent ability to control downy mildew but should be used for preventive purposes. For intensive treatment, in case of infections already in progress, the well-known antiperonosporics are used.

For the treatment, the application period and the doses, we advise you to read the instructions on the purchase package.

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Video: See how Grape Downy Mildew develops (June 2022).


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