Many small berries on grapes - the reasons?
Why on the bunches of grapes there are many small berries
At its grapes which year I observe this phenomenon.
On the ridges along with full-fledged large berries small, often seedless (even berries and berries) are tied.
Why is this happening? © I.Savelov Volgograd
Try to understand.
From biology lessons, remember that the flower of the plant consists of a pestle, around which stamens are located in a round dance. Stamens are thin stamen filaments with anthers and pollen on them.
The stamens are surrounded by a pistil, on the stigma of which this pollen should fall. So, when the flowering is hot and dry weather, the stigma of the pistil is dry and the pollen simply can not stick to it. When it's cold and rainy, the pollen is washed off the stigma.
Flowering lasts from a week to two. The most optimal conditions for natural pollination are air temperature in the range of 15-25 °, dry weather and light breeze.
The peroxylation of different varieties of grapes does not matter, but, on the contrary, promotes better baits. For varieties with same-sex flowers (for example, with a functionally female type of flower), special pollination is not necessary, it is enough to plant them between bushes with bisexual flowers.
Reference by topic: Grape packing: is it possible to avoid
The phenomenon, when pollen does not get on the stigma of the pistil or pollen is sterile (not capable of fertilization), but the fruits are formed, called parthenocarpie. The formation of parthenocarpic berries is commonly called hummocking.
It happens that small seedless berries are formed when incomplete fertilization. This phenomenon is called stenospermokarpiey.
So what can we do to help our grapes under bad external conditions during flowering?
Good results are obtained from pollination with puffs of rabbit fur. We take a blank from multilayer plywood or a board 10 × 20 cm in size, we additionally attach a handle to it for ease of use. On one side of the plane we beat rabbit fur with small cloves.
The fur is pre-washed in warm water with soap for degreasing and thoroughly dried.
With a light and fast two-time inflorescence clip between two puffs, we transfer the pollen from the previous inflorescences and simultaneously "recharge" the puffs with a new portion of the pollen.
In no case can you stretch the inflorescence between the puffs to avoid injury to flowers. After work, the puffs are washed with warm water and soap, dried and placed in dry paper bags. After three days, pollination should be repeated.
The effect of this operation is significant, especially in quiet weather, when there is no air movement or when there are precipitation. Conduct artificial pollination in the morning, in 9-10h.
There are a number of stimulants of fruit formation on the basis of the drug Gibberellin - Gibbersib, GibberROS, Ovary.
These drugs are used for better pollination of grapes, but working with them requires certain skills and accuracy. Personally, I prefer not to use chemical reagents in my household farm so that members of my family, and myself, eat organic berries.
A. Nemytov, full member of the IOIP
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- Many small berries on grapes - the reasons?
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