First, the cause of red sun grape sunburn is a non-invasive physiological disease. The main reason for its occurrence is the strong light irradiation and temperature change in the young fruit's expansion period. In the absence of crypts, the ear is exposed to strong radiation effects of high temperature, air drying and sunlight, and burns are caused by the imbalance of moisture in the young epidermis. Or it may cause burns by squeezing moisture from the leaf with high osmotic pressure to the osmotic pressure drop. The sun-burning pathogenic environment of the Red Globe grape fruit is the temperature of the young fruit during the expansion period of more than 30 °C, the air humidity is less than 30%, and the soil water content is less than 40% of the maximum water capacity in the field. The degree of morbidity was closely related to climatic conditions, shelf type, tree vigor, fruiting position and fruit quantity, fruit bagging sooner or later, fruit bag quality, orchard field management. After a sudden rainy day, the fruit is prone to sunburn after being exposed to direct sunlight; excessive plant growth, weakening of the tree vigor, and poor development of the leaf curtain layer will increase the occurrence of sunburn; the sunken fruit on the outer surface of the fruit tree and the sun will be heavy. ; Bagging too late or high temperature weather bagging, will make the sunburn aggravate; summer tips topping too early, improper handling of the auxiliary tip, excessive pruning branches, fruit emperor can not be properly shaded, prone to sunburn.
Second, prevention and control measures
1. Choose a suitable rack shape and use a cross-shaped rack to cultivate Red Globe grapes, which has a good effect on the prevention of sunburn.
2. Appropriate fertilization irrigation and organic fertilizer application, reasonable matching with nitrogen, phosphorus, potassium and trace element fertilizer. During the growing season, it is combined with spraying potassium and calcium. The grape berry season meets the high temperature dry weather promptly irrigation, lowers the park temperature, reduces the sunburn disease occurrence. After the rain or irrigation, timely cultivating tillage soil to maintain good air permeability and ensure the normal growth and development of the root system.
3, scientific management of vines to do a good job sparse flowers, reasonable load. During the summer cut, leave some leaves around the ear properly and turn the ear in a timely manner to cover the shade. In the absence of ear parts, appropriate removal of some leaves, timely picking the heart, reduce the number of young leaves, to avoid excessive leaves, compete with the fruit for water.
4. Doing good bagging should be done as soon as possible after the fruit set is stable. Choose waterproof, white, paper bags with good air permeability, and leave vent holes in the lower part of the paper bag. Before the bagging, the whole park sprays 1 time high-quality protective bactericide. After the liquid is dry, the bagging begins. Pay attention to avoid the hot weather and dew periods after the rain, and tighten the bag tightly. Before the fruit is harvested, go to the bag 10 days before harvesting. Do not remove the fruit bag at one time. Open the bottom of the bag first. The time for bag removal should be before 10 o'clock in the morning and after 4 o'clock in the afternoon. Cloudy days can be conducted throughout the day.
Astragalus Membranaceus, also known as Mianqi. Herbs perennial, 50-100 cm tall. The main roots are thick, woody, often branched and gray-white. Stems erect, upper branched, finely angled, white pubescent. Herbs perennial, 50-100 cm tall. It is produced in Inner Mongolia, Shanxi, Gansu, Heilongjiang and other places.
The medicinal use of Astragalus membranaceus has a history of more than 2000 years. It has the functions of enhancing immune function, protecting liver, diuresis, anti-aging, anti-stress, antihypertensive and a wide range of antimicrobial activities. However, it is forbidden to use the evidence of excessive superficial pathogenic factors, stagnation of qi stagnation and dampness, stagnation of food accumulation, excessive heat and toxicity at the beginning of carbuncle or after ulcer, and excessive Yin deficiency and yang.
Astragalus Membranaceus
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