What about the grapes burning the leaves ?

From the harvest period to the harvest, the leaves are prone to symptoms such as scorching and disease spots, which can easily cause a large number of leaves to fall. Affects photosynthesis.

Nutrients**, reducing fruit quality, shoot ripening and lignification, etc. The leaves are scorched, as if they have been burned by fire, and growers often call them "fire leaves".

This is usually caused by the following reasons:1. Drought:Dry weather causes premature yellowing, scorching and shedding of leaves, especially in the pastKyohoThe line breed is sensitive.

It is normal for the occurrence to be small, the branches are partially old and the new leaves are normal, and the problem is not big.

2. Deficiency:After the grapes are harvested, they appear noticeable on the grape leavesMacular spots (or plaques).It is mostly caused by nutritional problems, such as magnesium deficiency, zinc deficiency, etc., magnesium deficiency is mainly the yellowing of the old leaf mesophyll, and the zinc deficiency is the loss of green leaf veins.

3. Diseases:As a result, there is more rain in the later stage, downy mildew.

Brown spot disease and other large areas occur, resulting in early defoliation.

Grape leaves are infected with downy mildew frontally.

Grape leaves are infected with downy mildew on the back.

Caused by brown grape spot.

4. Pests:The leaves of the grapes are red, and when they fall off, they are beetles, leafhoppers.

The possibility of harm is relatively high.

The front of the leaves of the grape leafhopper is pestful.

The leaves are seriously damaged.

Accurate, comprehensive solution:1. Supplement tree nutrition:After fruit picking, apply fruit picking fertilizer in time. It is recommended to take a full-fledged NPK.

Balanced fertilizer is the mainstay. After mid-September, the base fertilizer will be lowered; Orchards with vigorous trees can be applied less or no at all, and the base fertilizer can be directly applied in the later stage. High-purity potassium dihydrogen phosphate can be selected for root topdressing.

2. Timely irrigation:In order to promote the normal growth of grape branches and roots, and promote the transformation and absorption of nutrients by grape plants, it is necessary to combine irrigation and permeability once during fertilization. However, if autumn floods occur, ditches should be opened in time to reduce the air and soil moisture in the vineyard and control the damage of fungal infection.

3. Deep ploughing of loose soil:The deep ploughing greatly deepens the soil layer of the vineyard and improves the soil micro-environment, which is beneficial to the vines.

New roots germinate, accelerating the rapid growth of the root system.

4. Autumn scissors: After the fruit is harvested, it is necessary to lose no time in autumn pruning. During autumn pruning, the dry spikes, diseased branches, insect branches, tendrils, and residual leaves should be mainly cut off to reduce the number of branches and leaves without photosynthetic efficiency, and the robust branches and leaves should be deliberately retained to ensure the normal nutrient accumulation of the tree.

5. Pest control: Post-harvest pest control mainly includes leaf preservation, killing disease sources and insect sources. At this time, the focus of pest control is downy mildew, brown spot, black pox, tiger beetle and penetrated moth and some root diseases (rotten roots, nematodes, etc.).

This phenomenon may be due to the lack of nutrients in this plant, at this time we should carry out a fertilization in the soil of the grapes, and then prune the branches and leaves of the grapes, and water them in time.

It may be that the sun is too strong and the leaves are bent, so try to cover the vines with shades.

Grape leaf burns are grape burns.

Grape burn disease occurs mainly on the ears of fruit. The fruit is damaged, and light brown patches appear on the surface of the fruit, which then enlarge and slightly concave to become brown, round, and dry scars with inconspicuous edges. The affected area is susceptible to anthrax. The fruit coloring period stops at the ripening stage.

Grape sunburn is caused by the lack of shade in the fruit ears, and under the scorching sun, the surface of the fruit is burned, dehydrated, and brown patches are formed. Fences are more diseased than scaffolds; The disease is severe in dry weather before the young fruits swell to the syrup; The topping is heavy, and the area of the accessory tip leaf is small, and the disease is severe; Varieties with small leaves and few secondary tips are severely diseased; Plants with too much nitrogen fertilizer have a large leaf area and a large amount of evaporation, and the fruit is also seriously burned. When the weather suddenly changes from cool to hot, the fruit tissue cannot adapt to the sudden high temperature environment, and it is also prone to daily burning. It generally occurs in mid to late June in Jinan.

Eurasian grapes such as white lotus seeds, bottles, and black and cold grapes are also more seriously affected.

Prevention and control methods. For varieties that are prone to solar burn, when pruning in summer, leave more leaves or secondary tips near the ears to shade the ears. Reasonable fertilization, control excessive application of nitrogen fertilizer, and avoid plant growth and aggravation of daily burning. Pay attention to drainage after rain, loosen the soil in time, maintain the permeability of the upper soil, and facilitate the absorption of water by the tree.

The first means to alleviate pesticide damage is to spray the pesticide-damaged plants with water as soon as possible after spraying The production of pesticide damage is effective by reducing the concentration of the drug In addition, the drying of grape leaves is not necessarily caused by pesticide damage, it may be sun burn, fertilizer damage leads to seedling burning, drought damage causes leaf scorching, and disease causes leaf lesions to wither The specific situation still has to be determined according to the performance of your grape plants The most convenient and fastest way is for you to take some samples and go to the local plant protection station for consultation, which is free of charge

Determined to be burns. The reason is that the temperature is too high and the sun is sunburned, so it is recommended to build a shade net and water more appropriately.