Rhododendrons, how to maintain and manage after flowering?

Rhododendron, also known as Yingshan red. It is a small deciduous tree, when it blooms, the flower color is diverse, the flowers are like a brocade, and when planted in pieces, it is beautiful and spectacular. When potting, it is more placed on the flower stand and tea table, and the ornamental value is better. However, in the maintenance process, if the maintenance is not in place, it is easy to cause common problems such as falling leaves, dead branches, and yellow leaves.

【1】Change pots after flowering:

Potted rhododendron, after flowering, timely change pots, supplement nutrient soil, and adjust the PH value to the appropriate acidity for rhododendron growth, generally the soil PH value of rhododendron grows well between 4.5-5.5.

【2】Pruning after flowering:

After flowering, dead branches, stumps, weak branches, dense branches, diseased branches, etc. should be pruned in time, and some useless twigs that sprout on the branches should also be removed. The main reason why the retained branches should not be shortened is that the leaves of rhododendrons are multi-clustered at the top of the branches, and it is easy to extract a new branch after flowering, and grow new leaves, and the old leaves will fall off, and then the top buds will differentiate. Therefore, it is important to leave strong branches, which is related to how many flowers will bloom in the coming year.

[3] Fertilization method

Rhododendron fertilization should be done diligently, after flowering, due to the need to open new branches, you can increase the amount of fertilizer in an appropriate amount, but you can not apply thick fertilizer, so as not to apply too much fertilizer, resulting in fertilizer damage. The main reason is that rhododendrons belong to the dense root system, the absorption capacity of fertilizer is weak, if the fertilizer is too much, it is easy to cause rotten roots, leaf scorching, and even death. In particular, small seedlings that are born two years a year should be paid attention to. In order to be able to make the rhododendrons grow normally after changing pots, a thin fertilizer can be applied about half a month after the pot change, and a phosphorus and potassium fertilizer can be applied once to the flower bud differentiation period from June to August to promote the differentiation of flower buds; after autumn, 1-2 times of phosphate fertilizer can be applied to promote the pregnant buds.

[4] Watering essentials

After the rhododendron flowers pass through the pot, there is a process of slow seedlings, and the germinated root system is young, afraid of waterlogging and drought, so when watering, we must pay attention to the control of water volume, so as not to cause falling leaves. Under normal management conditions, the potting soil should be dry and wet, watered every 3 days or so in spring and autumn, and watered once a day in the morning and evening when the summer is high. In addition, when watering, pay attention not to water alkaline water, you can add ferrous sulfate and vinegar in an appropriate amount when watering. The main reason is that rhododendrons like acids and do not like alkalis. If there is a lot of rain, drain it in time.

[5] Disease prevention and control methods

The common pests and diseases of potted rhododendrons include leaf swelling disease, leaf spot disease, leaf mite disease, etc., and rhododendron openland also has more serious damage to powdery mildew and reticulum bugs, which can take different control measures according to different diseases.

1. Leaf swelling disease:

Prevention and control method: timely removal of diseased leaves found. At the beginning of the disease, spray 58% methyl cream 500 times zinc or 0.3% to 0.5% of the Pomeruite sulfur compound 3 to 4 times.

2. Leaf spot disease:

Prevention and control methods: In July to September, the prevention of disease is more severe, spray 58% methyl frost ling manganese zinc 00 times liquid, 20% powder rust 4000 times liquid or 50% daisen manganese zinc 500 times liquid and other drugs, spray once every 7-10 days.

3. Leaf mites:

Prevention and control methods: spraying avermectin or pyridoxine, zygoxine, etc. can be.

3. Powdery mildew:

Control measures: spray cymbidazole, azoxystrobin, powder rust rather than rice.

4. Net bugs:

Control measures: Spray chlorpyrifos, cyanopyrron, focusing on the back of the leaves.

This article is originally created by Zhongwei Happy Forest Garden Maintenance, more about the small knowledge of tree maintenance, welcome to comment in the message area!

(Disclaimer: The picture comes from the network, only for learning, if there is infringement, please contact the administrator to delete)