What to do if the primroses withered (causes and solutions) the culture methods of primroses

Primroses are brightly colored and deeply loved by people. The cultivation of this kind of flowers has higher requirements for time and soil. Its flowering period is relatively short. People often choose to plant it from June to September, when the temperature is relatively low. So it is the right time to plant a few pots of beautiful primroses for your friends.

What to do if the primrose has withered (cause and solution)

1. Primroses are short of water

Water deficiency caused by wilting is a common phenomenon in breeding primroses. Performance in the primrose leaves yellow, dull, drooping leaves, withered. There are two reasons for water shortage and withering: first, due to the high temperature and heat in summer, the air is too dry and the water evaporates greatly, resulting in dehydration and wilting due to its inability to supply water normally. Second, due to the lack of water in the basin soil, the amount of water watered each time is too little, which only moistens the surface of the basin soil, but fails to water thoroughly and cannot go deep into the basin bottom, so the lower roots cannot absorb water. Over time, flowers wither because they do not get water. Treatment methods should replenish water in time when the above two conditions occur, pay more attention to observation in summer, watering should be sufficient, but do not accumulate water, make the soil moist, and keep the surrounding air humidity low, which is the healthy growth of the plant.

2. Primula disease

Lead to wilt due to the large alternation of winter and spring seasons, so that primroses are attacked by diseases, specifically, the leaves lose their original luster and vitality, become very soft, followed by the lower leaves gradually withered, and finally spread the whole plant. The treatment method uses Tuccinol for sterilization and disinfection. if it is found in time and gets up early in the infection, it can be recovered in one day through the treatment of Tumenol. If the infection time is too long and the petiole has begun to rot, the recovery period can be up to two weeks.

3. Fertilization of primroses

Lead to wilt flower friends wholeheartedly hope that primroses blossom and lead to too much fertilizer supply, eager for success, so that primrose leaves yellowing edge, leaves withered, for a long time will lead to the death of leaves. In case of excessive fertilization, pour more water and wash away too much fertilizer in the soil, or turn the basin and change the soil immediately, so that the plant can gradually return to its normal growth state.

Culture methods of primroses

1. The culture time of primroses

Primroses are mostly cultivated by sowing, which is suitable for sowing from June to September. It can be planted at the end of June every year. The temperature is higher in summer, and the survival rate of transplanted seedlings is lower, so it needs to be maintained and managed in a cool place. The temperature from August to September is not so high, and it is more convenient to breed at this time, but the development period of primroses is shorter, the plant growth is shorter, and the florescence is short. At this time, if unreasonable breeding, it will reduce the ornamental value of primroses.

Therefore, it is most appropriate to sow the seeds directly when they are ripe. Techniques for cultivation of primroses in pots when cultivating primroses, the seeds should be evenly spread with fine sand, and then the surface should be compacted with smooth glass or template, which is beneficial to the nutrient absorption and rooting of the seeds. The seed is too small, do not cover the soil after sowing, use the soaking method to irrigate, submerge the basin soil into half of the water, wait for the soil in the basin to be wet, place it in a cool place and cover it with glass. It can sprout within two weeks, remove the glass and gradually increase its photosynthesis.

2. Soil selection of primroses.

The pot soil of primrose should choose rotten leaf soil and garden soil and mixed loam with a small amount of base fertilizer. The soil should use a slightly acidic soil with loose and fertile soil and good ventilation and drainage, which is beneficial to the development of the root. Primroses were transplanted to the pot until 2-3 true leaves were grown, and the pot diameter 7cm was the most suitable to wait for slow seedling and apply mature liquid fertilizer once a week. One and a half months later, the pot was replaced with 13-15cm.

Primroses should apply thin liquid fertilizer once a week and keep the soil moist and not too dry; excessive moisture evaporation and absorption of soil in winter will lead to rotting roots, so watering should be reduced. Primroses are more difficult to pass the summer. If you want to keep them blooming in the coming year, you should make them safe under the month, change the pots after the flowers have faded, and put them in a cool and ventilated place to prevent the sun from blowing and reduce the amount of water. When it is hot and hot, water should be sprinkled to the ground to maintain a certain amount of humidity and wait for maintenance and flowering in the coming year.

Disease control of primrose

1. Symptoms of mosaic disease

The mosaic disease of primrose is a whole-plant disease caused by mosaic virus, which can lead to abnormal or smaller leaves of the plant, which is characterized by dark green markings distributed throughout the plant. If plagued by such diseases, infected plants will not blossom, flowers are small deformities, mainly by aphids to spread the virus, the disease mainly infects the infected plants of the surrounding weeds. First of all, the control methods are to remove weeds and diseased weeds, destroy them centrally, reduce the source of infection, and then eliminate aphids in time to prevent the spread of the virus.

2. Symptoms of brown spot disease

Primrose brown spot disease often occurs in the spring of the four seasons, caused by bacteria. Brown spots appear on the leaves of infected plants. Through the spread of wind and rain, the virus of susceptible plants will be spread to other plants. In the early stage of the disease, 70% chlorothalonil was sprayed for prevention and control.

3. Symptoms of gray mold

Botrytis cinerea is the most common disease of primroses, which occurs all over the country. When the plant is infected by the disease, the whole plant becomes yellow and leaves fall. The disease mainly infects leaves and tender stems. Most of them occur at the tip and edge of the leaf. At the beginning of the disease, the plant will produce water-like spots, and then gradually enlarge to form brown patches and gradually rot.

In the later stage, each layer will form grayish yellow, which will gradually rot and fall off. If the climate is relatively humid, the disease is characterized by gray mildew layer, which occurs when the temperature is 20 ℃, and the air humidity is the most likely to occur. The control methods should be planted reasonably, and the planting density should not be too close. Pay attention to maintaining the ventilation of the environment and reducing the humidity in the air. Cut off the diseased leaves and residual branches in time to reduce the source of infection, so that the incidence will be reduced. During the onset of the disease, 50% Sukeling is sprayed for prevention and control.

Pest control of primrose

1. Long-tailed pink scale

The long-tailed pink scale harms many kinds of flowers, including primroses. It absorbs the juice of the stems and leaves of primroses with the thorns of adults and nymphs, which has a great effect on the whole development of primroses. Control methods if the insect damage of the long-tailed pink scale is less, we can scrape it manually or use liquor for disinfection and brushing. In the period when nymphs hatch and flourish, spraying 1000 times of fenitrothion can kill a large number of pink scale with long tail.

2. Red spider

The red spider is also known as the cotton red plant, the scientific name is spider mite. The body color of the adult red spider varies greatly, generally red, with black spots on both sides of the back of the body; the young mite is nearly round, there is a black version on both sides of the body, and the red spider nymph has four pairs of feet. Red spiders like to live in a high-temperature and dry environment, hot summer, will make its rapid reproduction, red spiders more harm to the back of the leaves, serious harm.

There are obvious massive pigments on the side of its body. Red spiders harm the stems and leaves of plants during reproduction and reproduce through stems and leaves. How to prevent and control red spiders can scrape off the bark for centralized destruction before overwintering hatching, and painting the trunk with lime water can kill a large number of eggs. In addition, in early spring, the fields can be turned over and weeds removed so that red spiders can not find food, resulting in gradual death.

Beautiful primroses are very good-looking and colorful after flowering, but once insect pests and diseases appear, they will affect the effect of their flowering, so the above methods for the prevention and control of insect pests and diseases are very effective. When the above situation occurs, we can prescribe the right medicine to the case. We will certainly be able to restore our primroses to health quickly.