Recently, Chen Minliang, a kiwifruit grower in Cuifeng Town, Zhouzhi County, Shaanxi Province, reported that a number of fruit trees in his family’s kiwifruit orchard began to have dry leaves. This happened last year. Moreover, the deciduous fruit trees in the successive years have a significantly poorer tree vigor and yield, which makes him very distressed. On this issue, the reporter interviewed Zhang Anmin, technical director of the Zhouzhi County Science and Technology Association. Zhang Anmin pointed out that the phenomenon of defoliation of kiwifruit in the full fruit period is mainly due to the summer intense light burning leaves, tree overload, tree structure is unreasonable and disease and other reasons, for which he proposed the following prevention and control measures.

Orchard grass or tree tray cover Choose green fertilizer such as shamrocks, hairy pods, etc. to plant in the rows, reduce ground temperature, increase air humidity, improve microclimate conditions in orchards, and reduce leaf burns. For the orchard that does not grow grass, Zhang Anmin suggested that it could use wheat straw, wheat bran, corn stalks, etc. to cover the tree plates with a thickness of 10 to 15 centimeters. Pressing a small amount of soil on the ground can reduce the ground temperature, increase the content of organic matter in the soil, and enhance the tree. Body growth potential.

Leap and sparse fruit, a reasonable load of strict sparse fruit, reasonable fruit. Zhang Anmin suggested that 3-4 rows of mature planting orchards should be planted with 480 or so fruit per plant, and the yield per mu should be controlled at 2,200-2,500 kilograms, so as to avoid fruit nutrient deficiency due to excessive fruiting.

Reasonable summer shear, strengthen the water and fertilizer management growth season, timely picking the heart and removing germination, cut off the invalid leaves, make the orchard have good ventilation and light, and the branch buds grow robustly. According to the situation of reasonable irrigation, the leaves in the morning need not be wetted in a timely manner to ensure that the orchards do not lack water; in the rainy season, attention should be paid to drainage to prevent rooting. According to the need of formula fertilization, increase organic fertilizer, cultivate strong tree vigor and enhance tree disease resistance.

Timely prevention and control of diseases Zhang Anmin pointed out that the pathogenic bacteria causing brown leaf spot and black spot disease of defoliants generally overwinter on their sicknesses. Therefore, it is necessary to remove fallen leaves in time in winter and clean the garden with 3 to 5 Baume degree lime sulfur agent. Small pathogen base. In addition, in the middle and late April of spring, the initial infection period of the bacteria, Zhang Anmin suggested that you can choose a suitable fungicide for chemical control, combined with pesticides and spray fertilizer, every 15 to 20 days to spray a drug, to achieve meticulous and uniform, And pay attention to the alternate use of agents to prevent bacteria from developing resistance.

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