Gibberellin for grapes: instructions for use and processing rules

Plants produce their own hormones that affect cell division in stems, leaves and fruits. In hybrid grape varieties, as a result of selection, inflorescences often have sterile pollen. They require additional pollination in order to ripen full-fledged clusters. One effective yield booster for single-sex grapes is gibberellin.

What is gibberellin?

Gibberellin is a hormone obtained microbiologically from a fungus. The drug is an analogue of the natural phytohormone produced by the grape seed after the formation of the ovary.Artificial gibberellin is not an alternative to natural pollination. The functional purpose of the drug is to stimulate the growth of the berry.

If the bud is not pollinated during the flowering of the vine, then no seed is formed in the ovary. As a result, the berries do not grow and do not gain mass, which leads to the fall of the ovaries, the peeling of the fruits in the bunch. Such situations are typical for seedless varieties and same-sex hybrid forms.

The preparation was developed over 20 years ago for the treatment of vineyard varieties of sultanas. Subsequently, gibberellin began to be used on grapes with functionally female flowers. The hormone, getting on the skin of the ovary, is absorbed into the berry and causes an increased metabolism without the formation of seeds.

When processing the vine at the flowering stage, the substance enters the stamens, further exerting a positive effect on the mass and size of the berries, the appearance of the bunch, also without the formation of seeds. Large grapes in a bunch without seeds (not sultanas) are a consequence of the treatment of the vine with gibberellin.

Pros and cons

The use of gibberellin increases the yield of single-sex vines and sultana varieties by 1.5-2 times. The use of a phytostimulator is especially important under unfavorable weather conditions for pollination: in cloudy, cool, rainy weather.

Other benefits of using a phytohormonal agent:

• improvement of the presentation of bunches of grapes;
• acceleration of berry ripening by 5-7 days;
• increasing sugar content;
• improved keeping quality.

The drug is not toxic to humans, animals and insects. Vineyard processing does not require protective equipment for hands and respiratory organs.

The disadvantage of the drug is the lack of an exact dosage for each variety. For this reason, vines of different varieties should not be sprayed with the same concentration of phytohormone.To obtain an increase in the productivity of the vine requires an accurate dosage, determined by experience.

Processing should be carried out in the evening to prolong the absorption of the hormone into the shells of flowers and ovaries. For complete assimilation of the stimulant, plant tissues require 6-8 hours. Rainy weather during this period reduces the effect of processing. The procedure needs to be repeated.

Instructions for using the drug for grapes

Gibberellin is available as a white powder packaged in plastic bags. The weight of one sachet is 300 milligrams. The average rate for a single-sex variety is 25-30 milliliters per 1 liter. Seedless varieties without seeds - the rate is doubled / tripled.

The substance does not dissolve in water. An alcohol solution is preliminarily prepared: for 300 milligrams - 10 milliliters of alcohol. The dosage is carried out using a syringe: 1 milliliter of solution=30 milliliters of gibberellin. The finished solution is added to water.

Inflorescences are sprayed or, for better contact with the hormone, dipped into a container with a solution. The procedure is carried out twice during flowering (in the middle and at the end) and a week after the end. Normalization of the load is carried out after the formation of clusters.

In the first year of using the hormone, the dosage is selected empirically, spraying grape inflorescences with solutions of different concentrations. At the end of fruiting, the optimal rate of an alcohol solution per 1 liter of water is determined.

Contraindications for use

Phytohormonal agent is not recommended for bisexual varieties, as it does not have a significant effect on yield growth. Excessive concentration for seedless varieties and same-sex hybrids leads to tight clusters.

Too tight fit of berries causes cracking and development of gray rot.

Crop care after processing

After spraying with gibberellin, plants require intensive care: watering, top dressing, weed removal. A faster metabolism requires more nutrients.

Gibberellin storage nuances

Dry gibberellin is stored according to the conditions specified by the manufacturer. An alcohol solution in a glass container retains its working properties indefinitely. Water-alcohol solution is suitable for use no more than 3 days.

Analogues

To increase the yield and presentation of table grape varieties (hybrid single-sex forms and varieties of sultanas), different variants of gibberellins are used. Phytohormone "Gibberellin" contains gibberellic acid A3.

Phytostimulants are commercially available containing several varieties of gibberellins and additional components:

1. Gibbersib. The active substance is a combination of gibberellins A3, A7.
2. "Universal ovary". The active substance is sodium gibberellic acids of high concentration.
3. "Bud". The active substance is sodium gibberellins of high concentration in combination with humates and microelements.

Fruit-forming preparations "Universal Ovary" and "Bud" are used not only for vineyards, but also for growing vegetables, flowers, fruit trees.

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