The red grape is greatly inferior to the sunburn disease and has now become a major focus and difficulty for fruit growers.
The main symptoms of red grape grape burn disease concentrated in the ear, after fruit damage, the skin appeared irregular light brown patches, after the patch gradually expanded and slightly depressed, dark brown. However, no abnormal symptoms were observed in the flesh beneath the lesions, and the ear of daily burning became soft and drooping. It was vulnerable to anthrax and white rot and caused serious economic losses.
The onset of disease is a non-invasive physiological disease. Under the strong radiation of high temperature, air drying and sunlight, the damage caused by the burning of the tender skin tissue of the berry.
The pathogenic environment caused by the daily burning of the red grape grape ear is the garden where the air temperature exceeds 30°C, the air humidity is less than 30%, the soil water content is less than 40% of the maximum water capacity in the field and the soil permeability is poor; the plant results are excessive, the vigor Weakness, poor development of the leaf curtain layer, will increase the incidence of sunburn; summer shoots picking prematurely, excessive treatment of the auxiliary tip, the ear is difficult to be protected by the leaf curtain is also easy to cause the ear to burn; single application of fertilizer, organic fertilizer is insufficient, The serious shortage of potassium, phosphorus, and calcium in the soil and the improper selection of rack type are important reasons for artificially induced this disease.
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