From May to July, it is a key period for the nutrition and reproductive growth of kiwifruit. It is also an important stage for fruit enlargement and fruit tree shoot. The summer management technology of kiwifruit is as follows. It is hoped that the majority of fruit farmers can learn from reference and strengthen the management in the near future to ensure high yield.
1. Prevent wilting. There are two main reasons for the wilting of kiwifruit during the high temperature in summer: one is high temperature and drought, and it occurs mostly at 12 noon to 4 pm on sunny days. It recovers sooner or later, usually in large areas. In this case, the water should be poured in the morning and evening, and the wilting can be lifted. The second is root path rot, root knot nematode disease, etc., which causes pathological wilting of root function. At noon, the performance was the most serious, and it lasted for a long time. In severe cases, it showed symptoms in the morning and evening, and it was sporadic. Once found, it should be grounded to check whether it is a pest or disease. The branches and leaves should be cut off, some or all of the fruits should be removed, and the roots should be selected by using pesticides such as agricultural anti-120 and bacteria.
2. Anti-sunburn. Sunburn is a physiological disease often caused by kiwifruit in summer. In addition to using high-temperature irrigation, reasonable summer shearing, maintaining appropriate leaf-to-fruit ratio, and controlling fruit load weight, etc., spray Merrill's high-efficiency calcium (15 to 20 days apart) during the young fruit period, and expose the exposed fruits one by one. Bagging can also effectively prevent sunburn.
3. Anti-shadowing. Fruit trees in the fruiting period, neglecting the buds, partial application or heavy application of nitrogen fertilizer, the tree body is easy to prolong and shade. In the summer, the buds are re-extracted, and the second branch of the germination after the first heart-picking leaves 3~4 leaves, and the third branch leaves 1~2 leaves repeatedly. Open the light path, and leave the outer branches on the shelf, and leave 2~3 leaves for the roots to remove the nutrient branches. The thin result branches and temporary result branches occurring under the shelf are short-cut and stripped. Remove the old leaves and yellow leaves. By adopting the above measures, we can achieve a high-yield landscape of "the tree is not entangled, the seams between the rows, the flowers under the trees, the branches see the sun".
In addition, kiwifruit should focus on the prevention and control of brown spot, gray mold, scorpion, red spider and other pests and diseases in summer. At the beginning of the disease, spray treatment can be carried out with 70% propionate zinc wettable powder 1000 times + 2.5% high-efficiency flumethrin microemulsion 2000 times. In the occurrence of the hazard period, 60% Baitai water dispersible granules 1000 times + 48% chlorpyrifos EC 1500 times; or 10% difenoconazole WP 1500 times + 4.5% beta-cypermethrin 1500 times; or 40% Fuxing 8000 Double +2.5% cyhalothrin 2500 times, spray control.
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