How to prevent grape berry cracking? A full breakdown of practical control methods
When is the best time to plant Vitis amurensis and how should it be planted? Is there a technical reference? Vitis amurensis can be planted according to the following techniques: 1. Planting period. Vitis amurensis is generally suitable for spring planting; seedlings can be planted once the soil layer deeper than 50 cm has thawed. 2. Planting techniques. (1) Soaking seedlings in water: before planting, soak the seedlings in clean water...
How do you prevent grape berry cracking? Are there any surefire tricks?To prevent and control grape berry cracking, Zhongdiwang teaches you in 7 words:
Supply, meaning evenly supplying water. If the soil is dry in the early stage of grape fruit growth, and then heavy rain or flood irrigation suddenly occurs after the coloring stage begins, the soil water content increases greatly. At this stage, the sugar content in the berries has gradually increased, the osmotic pressure of the flesh has risen, and water easily enters the fruit, causing the berries to expand rapidly and crack. To prevent cracking caused by improper soil moisture, water should be irrigated promptly when the soil is dry, and drained promptly after rain, reducing the difference between wet and dry soil at different stages, ensuring balanced water supply at every stage of fruit growth, which can appropriately reduce the occurrence of cracking.
Pinch, meaning pinching the growing tips. Promptly remove or cut off secondary clusters and pinch the tips of the clusters so that the clusters grow to a moderate size.
Thin, meaning regulating the load through thinning branches and clusters. Maintain a leaf-to-fruit ratio of 15-20:1; keep 2 clusters of fruit on vigorous vines, 1 cluster on moderate vines, and no clusters on weak vines. Before flowering, thin out some small clusters to keep the clusters appropriately loose and reduce the squeezing of berries against each other that forms cracking.
Spray, meaning spraying plant growth regulators and spraying water to cool down. 1-3 weeks before berry harvest, spraying 0.2% calcium chloride or 5000-fold calcium hydroxide and 0.2% amino acid calcium can effectively prevent and control cracking. If high temperatures occur during the young fruit stage of grapes, the orchard can be irrigated or the fruit trees sprayed with water to cool down before the high temperatures arrive. If dry weather occurs in the later stage of fruit development, irrigation should be done in small amounts and multiple times as much as possible, and flood irrigation must be avoided.
Prevent, meaning preventing the effects of adverse weather. Strong winds and high temperatures during the young fruit stage can also cause cracking. If high temperatures occur during the young fruit stage, irrigating or spraying water before the high temperatures arrive can achieve the purpose of cooling and reduce the occurrence of cracking.
Regulate, meaning the rational use of plant growth regulators. Earlier market launch and seedless cultivation of grapes can both be achieved by using plant growth regulators, but after using these regulators, abnormal cell division and enlargement in the fruit often occur, leading to cracking; especially when the spraying concentration and timing are improper, cracking will be more serious. Ethephon and abscisic acid ripening agents can be used; the suitable concentration of ethephon is 500 mg/kg, and abscisic acid is 100 mg/kg, and they must be used when 5%-10% of the berries have colored.
Control, meaning preventing and controlling pests and diseases. Do a good job of disease and pest forecasting, grasp the key points of control, and spray pesticides promptly. For disease control during the grape growing period, spray 50% carbendazim wettable powder at 800-fold, 800-fold Daconil M-45, and thiophanate-methyl at 1000-fold; to control red spiders, spray 2500-fold clofentezine; to control aphids, spray 3000-fold imidacloprid, etc.
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