Introduction of cultivation techniques and propagation methods of rhododendron, how to control rhododendron diseases and insect pests

Rhododendron is one of our common plants. Do you know the cultivation method of rhododendron? Let's have a look!

Measures for cultivation and management

(1) cultivation environment

1. Temperature and luminosity: the suitable growth temperature of new rhododendron varieties Taoyuan 1 and 2 is 22 ℃ ~ 32 ℃, and proper shading is suitable in summer to avoid leaf damage and plant growth retardation caused by high temperature in all-day sunlight. It can be cultivated all day in winter, and excessive shading will reduce the number of buds, the size of flowers and the color of flowers.

two。 Soil environment: prefer acid soil with good drainage and pH 4.5-5.5. When the soil is neutral to alkaline, iron deficiency is easy to occur between the veins of new leaves. Iron deficiency can be improved by irrigating iron chelate (Fe-EDTA) in soil, spraying ferrous sulfate (FeSO4) solution in leaves, or reducing the pH value of soil and cultivation medium.

(2) cultivation methods

1. Fertilization: appropriate fertilizer should be given after flowering, and the second fertilization should be carried out for the rapid growth period in spring and autumn. Slow-acting fertilizer is a good way of fertilizer supply, and 30N-4.4p-8.3K formula fertilizer can be diluted 1000 times if necessary. Pay special attention to the azaleas for the root system and shallow roots, excessive fertilization is easy to cause fertilizer damage.

two。 Pruning and height control: pruning can control plant height and promote branching of rhododendron. After the last pruning of potted rhododendron flowers was completed before the end of June, growth inhibitors CCC 3000~4000ppm or PP333 50~100ppm were sprayed to control plant height consistency and promote potted flower tightness and flowering uniformity.

3. Propagation: cutting propagation should use top shoot branch length about 4cm cuttings to propagate, cutting environment should be shaded about 70%, and appropriate spray should be given to improve air humidity, suitable for cutting about 30-60 days to root colonization, temperature below 16 ℃ will delay rooting.

4. Diseases and insect pests: attention should be paid to the harm of heart-eating borer during the season of shoot elongation and flower bud formation, leaf mite harm should be paid attention to at high temperature in summer, brown spot disease is easy to occur in high humid and warm environment, irregular black-brown gangrene spots on the leaf surface should be paid attention to and treated with chemicals regularly. Other common diseases and pests include military insects and Lepidoptera pests.

Promotion and prospect

The name Rhododendron of the genus rhododendron means "rose tree". Its flower shape and color are varied, and it is one of the most common landscape flowers with a wide range of applications. Its beautiful traces can be seen from parks, safety islands to the mountains. Xinbei City is the main nursery stock cultivation area in China, with an annual output of about 3 million plants.