What s the deal with kiwi leaf curl?

1. Chilling injury. Generally in the month, the temperature continues to rise and suddenly cools down, or the temperature is high during the day and low at night, the temperature difference between day and night is large, and the new shoots, flower buds, flowers and leaves are coldly damaged, and a large area of leaf curl appears in the park. This kind of leaf curling caused by temperature can only be prevented or mitigated by several measures:

1) According to the weather forecast, if there is a cold snap or frost, you can water it in advance to reduce frost damage. Lowers soil temperature and delays tree germination.

2) Spray antifreeze, spray Liangguoan, Wofengsu, brown sugar, polysaccharides, polysaccharides, polypeptides, chitosan and other polysaccharides in traditional Chinese medicine and fungicides can increase the content of soluble sugars in cells, thereby reducing the freezing point, in addition, Wofengsu also contains small molecules such as plant active glycopeptides, which can promote the synthesis of proteins and energy, increase the concentration, viscosity and elasticity of protoplasm, and improve its cold resistance.

3) Before the cold snap comes, set up a smoke pile every 15 meters or so in the wind direction above the orchard.

2. Last year's storage was insufficient, the nutrients needed for leaf development were insufficient, and the newly grown leaves were easy to wrinkle. The nutrients needed for leaf development and flowering are all last year's reserve nutrients, and the storage nutrients are sufficient, the flowers bloom well, the leaves grow well, and the oil is green. On the contrary, the leaves are prone to wrinkles and poor disease resistance.

During the leaf development stage, spray Liangguoan and Wofengsu, supplement nutrition, the leaves turn green early, mature early, the leaves are oily and thick, and produce more organic matter. Experiments have reported that the chlorophyll content of the leaves after spraying with Liangguoan and Wofeng is nearly twice that of the unmedicated ones.

3. Lack of calcium, boron and other trace elements. When calcium deficiency occurs, the new leaves are curled and deformed, and the plant will have leaf scorching disease, because calcium deficiency may cause nitric acid to accumulate in the young leaves, causing the growth point to shrink and the young leaf edges to burn. In boron deficiency, immature young leaves (more tender than young leaves) are thickened, misshapen, and twisted, and usually the tissue between the branches and veins is raised upward.

In this case, chelated calcium fertilizer, boron fertilizer, vofonin, etc. can be supplemented, and foliar sprays can be the mainstay. Especially calcium, the calcium absorbed by the root system is mainly supplied to the root system itself, and the calcium required by fruits and leaves is mainly sprayed. The ** ratio of calcium and boron is 8:

1. Boron can also promote calcium absorption.

There are two possible causes of kiwifruit leaf curling, the first possibility is that it lacks phosphorus, a nutrient that causes us to be malnourished by infusion, and curling will occur. It's also possible that your tree has been infected with some kind of fungus. Because the leaves are infected with fungi, the leaves become particularly dry and yellow, and they can also curl.

Kiwifruit leaf curl may be caused by leaf spot disease or root rot caused by excessive fertilizer and water, and the control methods are as follows:

1. Leaf spot.

1. Pathogenesis:

The pathogen overwinters in the diseased part of the leaf or in the diseased tissues of the leaf, and the disease begins around the flowering of kiwifruit in the following spring. In the rainy season, the disease spreads rapidly, and in some areas and some years, it can cause greater losses.

2. Prevention and control methods:

1) Disease-resistant varieties are selected in severely ill areas.

2) In autumn and winter, the garden should be carefully cleaned and the sick and remnants should be burned to reduce the source of overwintering bacteria.

3) Spray 700 times of 25% phenomyl EC or 900-l000 times of 50% methylmyxim wettable powder, 600 times of 12% green copper emulsifiable concentrate, and 1:1:200 times Bordeaux solution.

Second, rotten roots. 1. Appropriate fertilization and watering.

2. Irrigate the roots with Trim Root Root Rooting Agent, and slowly root and restore growth again in 5-7 days.

Drought. In the event of drought and lack of water, the leaves of any plant will wilt or turn yellow. Apple trees are no exception, and when there is a lack of water, the leaves turn yellow.

Therefore, according to the local rainfall, we should grasp the water absorption of apple trees and water them in time, so as to avoid the yellowing of leaves caused by drought and lack of water.

Moisture imbalance. Drought and lack of water in apple trees will produce yellow leaves, and uneven water absorption will also cause yellowing of leaves. This situation mostly occurs in the summer rainstorm more years, because the summer temperature is high, after the rainstorm will generally be sunny again, the sun to the upper leaves, the water will quickly evaporate dry, and the lower part of the sun, the leaf moisture evaporation slowly, the upper will appear yellow leaves.

Lack of fertilizer. Any crop that lacks fertilizer will affect its growth and yield, and the same is true for apple trees, which need enough nutrients to ripen during fruit bearing. If there is a lack of fertilizer, the apple growth will be poor and the yield will be low, and the yellow leaves, fruit drops, and leaf drops will occur, so that the plant will stop growing or even wither.

Therefore, in accordance with the growth rules of apple trees such as flowering, hanging fruit, and ripening, we should timely supplement an appropriate amount of nitrogen, phosphorus, potassium and other special fertilizers for apple trees, and provide water-soluble fertilizers for crops, which are very suitable for the growth of apple trees.

Pest. Pests and diseases are a major cause of yellow leaves in apple trees. The main pests and diseases are red spiders, white spiders, golden-veined moths, etc.

To prevent and control these pests and diseases, in addition to timely spraying, it is also necessary to do a good job of prevention from winter: the diseased plants should be brushed, all their fallen leaves should be swept out of the orchard, burned far away from the orchard, and the soil at the fallen leaves should be sprayed;

In the spring of the following year, these apple trees should be sprayed with corresponding pesticides as early as possible for prevention. The dry season is the high season of red spider and white spider, red spider and white spider form a web on the back of the leaves, suck the nutrients of the leaves, and must be strictly guarded and sprayed in time.

First of all, you have to know the habits of kiwifruit, kiwifruit is afraid of three joys and three fears, likes light and is afraid of sun, likes moisture and is afraid of waterlogging, etc., dryness is related to strong light, proper shading, especially in the seedling stage, more water will also cause this, and there is disease. You should pay attention to waterlogging prevention and apply some fungicide and trim foliar fertilizer.

There are a lot of kiwi cases, see some round spots at the leaf margin, this should be the harm of kiwi anthracnose, you can choose 10% difenoconazole, 25% benzobromid (charcoal), 20% flusilazole, prochlorazole, 43% tebuconazole these ** fungicides, and at the same time with 70% Dessenlian, 80% mancozeb, 25% azoxystrobin, 50% pyrazoxystrobin These partial protective agents can be used together to treat and prevent diseases.

But the most common kiwifruit should be canker, which is also a devastating disease, so we must pay attention to prevention.

For leaf spot disease, spray it with ordinary fungicides.

The problem may be a problem with the root system, it may be waterlogging, or root rot canker sunburn refer to it, and then shoot it out according to the actual situation.

Leaf spot is caused by root rot caused by excessive use of fertilizer and water.

1. Cockscomb leaf spot: infects leaves, petioles and stems. The lesions on the leaves are round, and then enlarged to irregular large lesions, and produce ring stripes, and the lesions change from reddish-brown to black-brown, **gray-brown. Stems and petioles are brown and elongated.

2. Fishtail sunflower leaf spot: small black-brown round spots are produced on the leaves, which are enlarged or the lesions are irregular and large, the edges are slightly raised, and small black spots are scattered on both sides of the leaves.

3. Orchid leaf spot disease: there are oval, elongated light reddish-brown lesions on the leaves, surrounded by a green circle, which expands into irregular large patches and produces black spots on the lesions.

Dear, hello, the reason why the leaves of the monkey kiwi tree are large but very thin: the leaves of the kiwi fruit are thin and brittle, the leaf area is large, the temperature is high in summer, dry, hot wind, and long-term sun exposure, the leaves are easy to dry and curl, resulting in a sparse phenomenon of leaves and fruits, and the reduction of photosynthesis affects the yield and quality of fruits. The partial application of chemical fertilizers, especially nitrogen fertilizers, affects the normal growth of roots due to long-term growth, weak tree strength, and long-term application of chemical fertilizers that may lead to soil knotting, acidification, and chlorination, and is prone to infection with pathogens such as tree yellow, deficiency, weakened tree strength, kiwifruit anthracnose, and brown spots.

There are several possible causes of scorching around the edges of the newly grown leaves of the kiwi tree:

Overwatering: Kiwi trees need plenty of water during the growing season, but overwatering the nucleus can lead to root rot and can also affect the plant's uptake of oxygen, resulting in scorched leaf edges.

Lack of light: Kiwi trees need plenty of sunlight for photosynthesis, and if there is not enough light, it can cause the edges of the kiwi tree leaves to scorch.

Excessive fertiliser: Kiwifruit trees need the right amount of fertiliser during the growing season, but over-fertilization can lead to salt build-up, which can lead to scorched leaf edges.

Solution: Control the amount of watering and keep the soil moist but not waterlogged.

Make sure the kiwi tree has plenty of sunlight and place the kiwi in a sunny location if it is maintained indoors.

Reduce the amount of fertilizers, especially nitrogen fertilizers.

Scorched edges of the leaves of the kiwi tree can be caused by insufficient water or malnutrition. Here are some things you can do to help with recovery: Sun Grip Kong.

Increase the amount of watering. Make sure the soil is kept moist, but not overwatered.

Fertilize. Use appropriate fertilizers to provide the necessary nutrients.

Check the environment in which the tree grows. Make sure there is plenty of sunshine, good ventilation, and the temperature is appropriate.

If the problem persists, it is advisable to consult a professional horticulturist or agricultural expert for blind examination and guidance.

Summary. Hello, if the kiwi leaves are wilted, you can try the following methods:1

Soak the leaves in warm water to make them soft; 2.Place the leaves in warm water and add a small amount of sugar to make them softer; 3.Place the leaves in warm water and add a small amount of potassium nitrate to make them softer; 4.

Place the leaves in warm water and add a small amount of sodium sulfate to make them softer; 5.Place the leaves in warm water and add a small amount of vegetable oil to make them softer; 6.Place the leaves in warm water and add a small amount of vinegar to make them softer; 7.

Place the leaves in warm water and add a small amount of lemon juice to make them softer; 8.Place the leaves in warm water and add a small amount of hot water to make them softer; 9.Place the leaves in warm water and add a small amount of honey to make them softer; 10.

Place the leaves in warm water and add a small amount of coconut oil to make them softer.

Hello, if the kiwi leaves are wilted, you can try the following methods:1Soak the leaves in warm water to make them soft; 2.

Place the leaves and sliders in warm water and add a small amount of sugar to make them softer; 3.Place the leaves in warm water and add a small amount of potassium nitrate to make them softer; 4.Put the leaves in warm water and add a small amount of sodium sulfate to make it softer; 5.

Put the leaves in warm wax water and add a small amount of vegetable oil to make them softer; 6.Place the leaves in warm water and add a small amount of vinegar to make them softer; 7.Place the leaves in warm water and add a small amount of lemon juice to make them softer; 8.

Place the leaves in warm water and add a small amount of hot water to make them softer; 9.Place the leaves in warm water and add a small amount of honey to make them softer; 10.Place the leaves in warm water and add a small amount of coconut oil to make them softer.