What is the best medicine for grape cluster elongation?
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Some fruit farmers want to know the best medicine for grape cluster elongation. Currently, for grape cluster elongation, one can use chemical synthetic hormones, biological hormones, or synthetic regulators, or manage through fertilization and irrigation. Different varieties have different levels of sensitivity to the medicine. The same concentration of medicine is more sensitive for European grape varieties than for European-American grape varieties.
Medicines for cluster elongation include gibberellin, Bihu, Youkangsu, Qibao, and other products that can be used as cluster elongation agents. However, it is important to master the correct concentration of use, especially for gibberellin and Youkangsu, as there are often cases of elongation being too long in production every year.
When to start the grape cluster elongation process, grape clusters appear at the same time as the leaves. As soon as the clusters emerge from the leaves (5-6 leaves), they can be treated until 10 days before flowering. The earlier the medicine is applied during this period, the more sensitive the grapes are to the medicine.
Medicine application method: For grape cluster elongation, it can be done by dipping the clusters or directly spraying the fruit clusters with the medicine solution. To save time and labor, direct spraying of the fruit clusters is commonly used in production. To enhance the effect, 3000 times of grey classic can be added to the medicine solution to prevent grey mold disease.
Precautions: Prevent grey mold disease. After the inflorescence is elongated, the distance between the branches in the cluster is increased. If grey mold disease occurs, the clusters will have gaps, affecting the quality and sales of the product. Medicines such as isoprothiol or pyrimethamine can be used. Some varieties must protect the fruit after elongation. Spray micro-boron before flowering to improve fruit setting rate. Cluster thinning and fruit thinning: When the inflorescence is elongated, the shoulder part of the small clusters is also elongated. After fruit setting, some fruit grains of the excessively long small clusters are cut to form a conical or cylindrical shape of the grape clusters; for varieties with secondary clusters, the secondary clusters should be removed before flowering; the tip of the cluster should be pinched off before flowering; after fruit setting, light fruit thinning should be done, removing small fruit grains to reduce the amount of thinning.
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