Vine treatments with sulfur

In vine cultivation it is very common to talk about the treatment of the vine with sulfur . Sulfur treatments on the vine are very common to prevent all kinds of diseases caused by fungi such as mildew or powdery mildew. 

In this post we are going to see what vine treatments with sulfur consist of, how they are applied, against what diseases they can be used, when is the best time to apply them and what main advantages and disadvantages they have.

Vine treatments with sulfur

Contents [ hide ]

  • 1 What are vine sulfur treatments?
  • 2 How are sulfur vine treatments applied?
  • 3 When to put sulfur on the vines?
    • 3.1 Grapevine mildew
  • 4 Vine powdery mildew
  • 5 When should sulfur vine treatments be carried out?
  • 6 Advantages and disadvantages of doing vine treatments with sulfur
  • 7 Sulfur treatments – Advantages and disadvantages
  • 8 Do you want to control all the treatments and have a good management of your vineyard?

What are vine sulfur treatments?

Vine cultivation is a crop sensitive to fungal diseases . After a rain, or several days with relative humidity and high temperatures, the leaves and shoots of our vineyard can be easily attacked by fungi present in the vineyard itself or in the environment.

What are vine sulfur treatments?

One of the main methods to prevent and combat fungal diseases is by applying sulfur. 

Sulfur is a mineral of volcanic origin that is very present throughout the earth’s crust. The presence of sulfur in vine treatments dries the environment of the leaf and produces toxic substances that prevent the proliferation of fungi, parasites and insects. 

Apart from being a mineral that fights pests and diseases, it is one of the main macronutrients of the vine , which makes it an essential in any vineyard. 

How are sulfur vine treatments applied?

Vine sulfur treatments can generally be applied in two ways: with water or powder:

  • The sulfur powder is applied directly onto the branches and leaves of the vine a duster . 
  • The wettable sulfur is diluted in water and applied with a spray bottle . 
How are sulfur vine treatments applied?
How are sulfur vine treatments applied?

The doses vary depending on the way the sulfur is treated on the vine. If we opt for powdered sulfur , a dose of 20-30 g / m2 is recommended, that is, 20-30 kg / ha . In wettable sulfur treatments, a dose of 0.25 to 0.75% is recommended, that is, between 250 and 750 g of wettable sulfur per 100 liters of water. 

When to put sulfur on the vines?

There are some main diseases for which it is recommended to do a sulfur treatment on the vine:

Mildew and powdery mildew are the two most important pests in the vineyard. Both diseases are caused by fungi and the application of sulfur can prevent and prevent their proliferation . 

Let’s see the differences between mildew and powdery mildew and when to sulfur the vineyard. 

Vine mildew

The downy mildew is one of the most feared fungi for winegrowers. If the environmental conditions are good , production losses can be very serious . 

As in most diseases of the vine caused by fungi, temperature and humidity are key to the proliferation of mildew. In the viticultural world there is a rule known as the rule of three tens that serves to know when the vine is most susceptible to getting mildew. 

  • Shoots over 10 cm long
  • Rains greater than 10 mm
  • Temperatures above 10ºC

Before this time, it is recommended to treat the vine with sulfur to prevent the growth of mildew. 

To detect mildew we must look for yellow and circular spots with white fuzz on the back of the leaves. These spots are produced by mildew and spread rapidly through shoots and clusters, significantly affecting production.

Vine powdery mildew

Also known as ash, ash or bad , powdery mildew is a disease of the vine caused by a fungus that winters in the plant remains of the vines and reproduces in spring when environmental conditions are favorable. 

From 15ºC, powdery mildew can begin to appear if the humidity is high, although the optimum temperature for propagation is between 25 and 30ºC . Temperatures above 35-40 ºC slow down the proliferation of powdery mildew. The main symptom of vine powdery mildew is the appearance of a white fluff that spreads throughout the green parts of the vine, including leaves, shoots and clusters. 

As in the case of mildew, it is recommended to periodically treat the vine with sulfur when environmental conditions are very favorable to the growth of fungi.

Downy mildew

When should sulfur vine treatments be performed?

Sulfur is a mineral product widely used to make treatments on the vine. Although it seems harmless and is even suitable in organic farming, it is very important to know its chemical properties well , since it can become highly toxic if not applied correctly. 

The effectiveness of sulfur as a phytosanitary is directly linked to temperature. Sulfur treatments on the vine begin to be effective after 20ºC in the vineyard. These temperatures coincide with the proliferation of pests, so at first glance everything seems positive. 

The problem comes when the ambient temperature exceeds 30ºC. From this temperature, the treatments on the vine with sulfur become toxic , burning the leaves and even the entire plantation. Therefore, it is very important to always follow the recommendations of the technicians and make the applications first thing in the day or late in the afternoon. 

Advantages and disadvantages of doing vine treatments with sulfur

TABLE ((     

Sulfur treatments – Advantages and disadvantages

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AdvantageDrawbacks
Natural and inexpensive product very effective against fungi and some insectsIrritating and very dirty product
Phytosanitary included in annex II of the list of products suitable for organic farming in regulation (EC) 889/2008.Very high toxicity if applied above 30ºC
Easy application and handlingHigh drift losses at the time of application
Good preservation of the product in cool and dry environments.Contact product, very volatile after rain or wind.

Do you want to control all the treatments and have a good management of your vineyard?

In Spain there are already more than 4000 farmers who manage their vineyards with Agroptima. In our agricultural management app you will find the software for phytosanitary products that allows you to write down all the treatments on your mobile , locate your vineyards, keep track of costs and profits and make the field notebook . If you have been interested, enter here to try it for free and know all the benefits of Agroptima. 

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