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Spring frost protection

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Eco-friendly candles to fight against spring frost

Vitisphere, Tuesday, November 26, 2019 - What the editorial staff saw at the 2019 SITEVI tradeshow

"Exit paraffin-based candles. Make way to stearin. STOPGEL, a family-owned company that has been selling candles for the last 25 years to fight against springfrost, is is showcasing at SITEVI its 100% ecological « STOPGEL GREEN » candle. [...] The benefits? It produces very little smoke. According to its users, it also produces a stronger flame than conventional candles."

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STOPGEL candles, this Sunday morning, in the vineyard of Cognac

SudOuest, Sunday, May 5, 2019

"At Auge-Saint-Médard, in the Rouillacais, the thermometer went down to 0.7 ° C and 0.2 ° C on wet bulbs. François Jérôme Prioton, a winemaker in the commune, was able to test one of the anti-frost methods already used in Bordeaux: the STOPGEL candles."

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Anti-frost candles and wind turbine together for a better protection against frost

Mon-Viti, Saturday, March 23, 2019

"The company STOPGEL recognized for its antiforst candles puts forward a new product. Barrel candles of 80 liters in natural wax to be placed between 20 and 30 meters around the wind turbines. "The heat that rises is then taken up by the blades of the wind turbines which ventilate hot air, explains Christian Chazalet. The autonomy is 5-6 hours. Count 8 barrels per wind turbine."

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Three methods to save orchards from frost

Ouest-France, Friday, May 5, 2017

"To warm the feet of apricot trees, an ultimate "remedy". 400 STOPGEL candles made of natural wax are installed on one hectare. The open flame reaches about thirty centimeters, and burns for eight hours. Without reaching the low leaves. [...] A square of cardboard inside the pot replaces the traditional wick. "They are lit with a gas stove. At night, we would even see them flambé "the road of Puy-de-Serre," says Michel Charbonneau."

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Des bougies pour protéger les vignes contre le gel

France Bleu, Tuesday, May 3, 2016

"Confronted with the risk of nocturnal frosts in his plots at the end of last week, the winemaker of Chavanay, Stéphane Montez, installed five hundred candles on nearly two hectares. A successful bet since even if the temperature went down to -2.5 degrees, his vines were not impacted!"

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Map 1. French regions affected by frost in 2017

(source : Vitisphere)

Climate change over the past decade has strongly impacted many facets of agriculture and remains to be one of our primary concerns.

We live milder winters, earlier bud breaks but at the same time, more episodes of violent and delayed spring frost. Frost spares no one today. This was evident during the frosts of April 2017 which affected the major parts of French vineyards as well as the other produce across Europe.

In this context, the fight against frost is one of the core foundations in sustaining our farms, even more than ever, considering the wide fluctuations in temperature.

Water spraying

The continuous sprinkling of water makes it possible to set up a water/ice balance around the bud for temperatures to not fall below 0ºC.

The sprinkling of water can be complicated: Even though water droplets freeze and create frost, they generate heat. The process of spraying if done incorrectly, can both reduce temperatures but at the same time increase frost, which would be damaging to your produce.

It is important to recognize that this method only prevents the temperature of the plant from falling below 0°C. It does not heat the temperature of the air nor the plant significantly.

Image 1. Water spraying on buds

(source : Les Vergers de l’Ile)

Heating devices

Image 2. STOPGEL GREEN Antifrost Candles

There are several types of heaters for vineyards and orchards.

Gas heaters or fuel burners are far from ideal solutions due to their significant carbon impact and high installation and maintenance costs.

Antifrost candles are the optimal heating solution. And today, the new generation of STOPGEL GREEN Antifrost Candles, with a 100% natural and renewable wax, is one of the best direct methods of protection against frost.

Lighting STOPGEL GREEN Antifreeze candles makes it possible to keep temperatures above 0ºC by warming the layer of air in contact with the crops. STOPGEL GREEN candles stand out from braziers or big stoves that, due to a chimney effect, lose heat and apt cold air to crops and soils, thus cooling certain areas to be protected.

STOPGEL GREEN offers an efficient heating method by setting up 6-liters candles evenly spaced across the field. The size of the STOPGEL GREEN candles make it possible to stay within the zone of temperature inversion, thus allowing the circulation of heated air at the height of the trees, vines and/or crops. Depending on the number of STOPGEL GREEN candles used, the temperature can be kept above 0ºC even during freezing weather down to -7ºC.

Figure 1. Zone of temperature inversion during a spring frost episode

(source : Omafra)

Image 3. STOPGEL GREEN Antifrost Candles lit in an orchard

Air ventilation

The method of air ventilation relies on two observations. First of all, cold air is found at the level of crops due to its higher density than warm air. Also, temperature increases a few meters over the field before decreasing again. Air ventilation puts in action the principle of temperature inversion by replacing the layer of cold air that is in contact with the crop by the warmer layer above it.

There are several types of equipment for air ventilation: fixed or mobile antifrost towers, also called wind turbines or the use of helicopters. The equipment and installation are expensive but can raise the temperature by 1 to 4 degrees Celsius.

When using a wind tower, it is essential to install additional heaters in the vineyard or the orchard with large antifrost candles such as 80-liters STOPGEL GREEN barrels combined with a chimney.

Image 4. Barrel STOPGEL GREEN for wind towers

Image 5. Barrel STOPGEL GREEN for wind towers with a chimney

For more information, please contact us

Tel. 33 (0)4 75 84 61 11 • Email : stopgel@wanadoo.fr

Specialized in the protection of orchards and vineyards against spring frosts,
we have been manufacturing STOPGEL antifrost candles since 1995.
 
     

sources : Les Vergers de l'Île - Bougies StopGel (Antifrost Candles), Institut Français de la Vigne et du Vin, Omafra

Next Generation Antifrost Candles

Your partner for the responsible protection of your vineyards and orchards with

STOPGEL GREEN

The 1st anti-frost candle of 100% natural origin, renewable and environmentally friendly.

STOPGEL candles, internationally recognized efficiency and know-how.

Specialized in the protection of orchards and vineyards against spring frosts,
we have been manufacturing STOPGEL antifrost candles since 1995.