How do persimmons cross? why do persimmon seedlings roll up leaves?

Persimmon contains very rich nutrients, such as persimmon actually contains pectin, vitamin c, carotene, iodine and so on. Basically everyone can eat persimmons, especially people with constipation or high blood pressure are very suitable for eating persimmons. Now more and more people begin to plant persimmons, but there are many problems during the growth of persimmons, such as how to cross persimmons. What happened to the rolled leaves of persimmon seedlings?

How to cross persimmons

1. Mainly pinch off all the buds at the top of the trunk when the height of the trunk is much different, so that it will not grow taller. Of course, for useless side branches and side branches of already high height, it is also necessary to pinch off the top buds.

2. The method of dividing persimmon into single and double pruning. That is, each plant leaves 1-2 heads, and the rest of the branches are broken off when they grow to 10 centimeters long. Early maturing varieties (except self-capping) leave 3-4 panicle fruit choking head, middle and late maturing varieties can leave 6-10 panicle fruit choking head according to the need. In this way, it will not grow any longer, and the nutrition will be retained to blossom and bear fruit.

3. The forking and pinching of persimmon should be determined according to variety, planting density, on-shelf or non-shelf cultivation, etc. If it is planting varieties with limited growth and non-frame cultivation, there are 2 to 3 branches when each plant grows to 30 cm high, 2 leaves on the main branch to the third flower, and 2 leaves on the side branch after 1 flower.

4. If the varieties with infinite growth are cultivated with scaffolding, there are generally two kinds of single-rod shaping and double-rod shaping. Single-rod shaping is to leave only the main branch, all the side branches are removed, and the double-rod shaping leaves one main branch and one side branch.

What happened to the rolled leaves of persimmon seedlings?

The main results are as follows: 1. Virus disease leads to curling leaves. There are six common types: mosaic type, fern leaf type, stripe type, giant bud type, curly leaf type and yellow top type. The infected plants are short, the leaves are curly and tufted, and in severe cases, there are only veins but no mesophyll. Virus diseases are transmitted through contact between virus-transmitting insects (such as aphids, whiteflies) and juices, and hot and dry weather is conducive to their occurrence. Prevention and control measures: 1. Select virus-resistant varieties. two。 Implement crop rotation to reduce the source of primary infection. 3. Spraying 1000 times potassium permanganate aqueous solution during the onset of the disease can control soft rot and other diseases, and can supplement manganese and potassium. To control aphids and other poisonous insects, you can choose 2000 times of imidacloprid or 20% of Kangfuduo 4000 times.

2.4For 2.4 Mel D, the symptoms of 2.4 Mel D were that the leaves or growing points were bent, the new leaves could not expand normally, the leaf edges were twisted and deformed, the stems were raised and the color became lighter. The drug damage symptoms of other hormones, such as dwarftin and paracetamol, were lighter than those of 2mae4murD. Control measures: the hormone concentration of mid-maturing varieties should be 20PPM, early-maturing varieties should be 15PPM, and the concentration should be lower when the temperature is high. When in use, pay attention to prevent it from touching the tender leaves or growing points, do not spray. After the occurrence of drug damage, you can apply some growth-promoting fertilizer, such as Opal, natural brassine and so on. The occurrence area of the drug damage is large and there is no disease center, which is different from other diseases.

3. Physiologically curled leaves, before and after tomato harvest, the leaves of the first ear were slightly curled, or the leaves of the whole plant were curled into a tube and became brittle. The reason is that due to high temperature and drought, the stomata of tomato are closed, resulting in leaf curling. Prevention and control measures: anti-drought exercise after planting to before fruit setting. After fruit setting, timely watering and fertilization, and covered with shading net. Cover it during the day and cover it at night on a sunny day, but not on a cloudy day.

4. The main symptoms of tea yellow mite are narrowing, stiff erect, wrinkling or twisting deformity, and finally bald tip. It's hard to recognize with the naked eye. The control agents can be 3000 times of chlorhexidine, 1.8% of 3000 times of chlorhexidine or 73% of 2000 times of chlorhexidine, etc.

5. the wind-cold invades the greenhouse too quickly, and there is a strong exchange between outdoor cold air and indoor warm air, which is very easy to cause the curl of tomato leaves near the vent. Under normal circumstances, as long as gradually release the wind to cultivate seedlings, this kind of problem will not arise.

6. phosphorus deficiency is characterized by purplish red on the back of the leaves, brown dots on the leaves, curls on the lower leaves, yellowing of the old leaves, and black-brown death of the leaf tips. Generally, the low temperature at the seedling stage will affect the absorption of phosphorus, and the acidity or compactness of the soil is also easy to lack phosphorus, which can be solved by applying phosphate fertilizer in the soil or spraying 0.3% potassium dihydrogen phosphate in leaves. Magnesium deficiency showed that during the expansion period of the first rosette, the old leaves in the lower part of the plant lost chlorosis, yellowing appeared between the veins, and then expanded upward to form yellow variegated leaves. In severe cases, the leaf is stiff or the edge is curled, and necrotic spots or brown bands appear between the veins. It can be solved by applying all-element fertilizer or foliar spraying magnesium sulfate 50 to 100 times.

Why persimmons grow out of shape

The fruit is out of shape. It must have been stimulated, causing it to grow out of shape. Sometimes the erosion of diseases and insect pests can also cause fruit deformation, but the deformation caused by diseases and insect pests is not as obvious as in the picture. These persimmons look so "deformed", it is indeed rare, in general, there are a variety of reasons will lead to fruit variation. For example, there are too many places where pesticides are applied, and in the process of spraying melons and fruits, they may be affected by the spread of wind or birds, which may affect the flowering and fruiting of fruit trees, so they become different. In addition, in the process of pest control and disease treatment of fruit trees, the emission and volatilization of pesticides will also lead to this phenomenon.

How to control diseases and insect pests of persimmon

1. Clear the garden in winter to reduce the number of overwintering diseases and pests. Combined with winter pruning, diseased fruits, diseased stems, withered branches and fallen leaves should be cleaned thoroughly to remove the source of overwintering diseases and insect pests.

2. Spray a 5-degree stone-sulfur mixture or 95% oil emulsion 150 times before spring germination.

3. On the basis of the above control, the main pests such as persimmon cotton scale, persimmon stem insect and paramecium can be scraped off the old bark and coated with 5 times 10 times omethoate, and the effect is remarkable. In addition, biological pesticides such as Bacillus thuringiensis or diflubenzuron are used as far as possible to control leaf-eating pests.

In the above article, the editor also introduces some problems encountered during the growth of persimmon and their solutions. In fact, persimmon is also a common kind of tree in rural areas, the nutritional value of persimmon is very high, so people can also eat some persimmons.