Key points of Bud stage Management of Rhododendron

Rhododendron likes cool and humid climate, requires acidic soil rich in humus, loose, moist, PH value between 5.5 and 5.6, has certain requirements for light, is not resistant to exposure, and should be maintained under semi-overcast conditions. The bud stage refers to the period from the beginning of the budding of azaleas to the blooming of most flowers, which is generally 90mur120 days. The length of this period has a lot to do with humidity and maintenance. In order to make the flowers bloom well and long, attention must be paid to the management of the bud stage. The main points are as follows:

1. Light

Azaleas are not allowed to be preserved under semi-overcast conditions, light is added properly at the initial stage of budding, and the period of bud expansion is weakened. Shading can delay flowering and prolong flowering, but it should not be too overcast or shine directly. Flowering cuckoos with excessive light should pay special attention to ventilation, otherwise it is easy to become stuffy, causing fallen leaves and causing great damage to vitality, and the air humidity had better reach 7080%.

two。 Moisture content

As the rhododendron is a shallow root slender root group, that is, afraid of drought and waterlogging, improper watering, light fallen leaves, heavy responsibility for death. Therefore, whether watering is proper or not is one of the keys to the cultivation of azaleas. During flowering, the potted soil should bring moisture, because the azaleas blossom in large numbers and require a large amount of water, so the petals will droop when they are not hydrated. Although the petals can stand up immediately, the edges of the petals fade, then turn brown, and the ornamental effect is poor. When heavy, it may even prevent the plant from producing new shoots after flowering. Watering should be directly into the basin, must not be sprayed from the crown, to prevent water into the heart of the flower water rot, shorten the life of flowers. It is usually watered every two or three days. It must be checked every day to ensure proper water supply. It is best to use water close to room temperature and avoid watering in the morning and evening, preferably after 10:00 in the morning and before 4 p.m.

3. Temperature

The morning and evening of flowering has the greatest relationship with temperature, high temperature early flowering, low temperature flowering late, so the control of temperature can prolong the flowering period. The optimum temperature after flowering is 10 ℃ 15 ℃ during the day and 10 ℃ at night. If the temperature is too high, it will help to shoot and reduce the bud. After flowering, coolness at low temperature is beneficial to the prolongation of flowering period. The temperature change of the maintenance environment should not be too big, at the same time, cold air should be avoided to blow plants directly, and windy weather must be windproof. We should pay attention to the changes in the weather and take preventive measures at any time.

4. Pest control

Azaleas like to grow in a shady and humid environment, so there are more chances of infection of diseases and insect pests, especially the western cuckoo. Pay attention to the prevention and control of flower rot in the bud stage, so as not to shorten the florescence, droop the flowers, and wilt and fall off in the early stage. After petal infection, the diseased part loses its luster, becomes waterlogged, softens, fades, and finally rots and blackens, and the gray mold layer grows on the surface when it is wet, which affects the ornamental. The residual flowers should be removed in time and watered as far as possible not to the petals. Spray 600 times of mycophenolate mofetil or 50% of 800 / 1000 times of ammonium benzoate once a week to control the occurrence and development of the disease. Common pests are red spiders, military insects, terminal bud leaf rollers and so on. It is found that they can be treated as early as possible and can be sprayed with 1200 times omethoate.