Planting Tips

Chapter 56 Which flowers are mainly affected by viral diseases?how to prevent
Viruses are such tiny parasites that their shape can only be seen with an electron microscope.Diseases caused by viruses infecting flowers are called viral diseases.

The virus disease parasitizes in the living cell tissue of the flower, and spreads to the whole plant of the host along with the transportation of the organic matter of the host, often causing symptoms such as mosaic, bad spots, deformity, discoloration, and necrosis of the host plant, among which the mosaic type is the most common.

Mosaic virus disease is characterized by uneven color of leaves, forming dark green and light green symptoms, which is the most common virus disease on flowers.Lilies, gladiolus, narcissus, carnation, dahlia, orchid, zinnia, petunias, and Rosaceae flowers are prone to mosaic virus disease.In addition, there are cyclamen virus disease, chrysanthemum virus disease and so on.In recent years, domestic flower virus diseases have a trend of expanding the scope of infection, and now they have risen to the position second only to fungal diseases.These diseases are serious and difficult to control.

So far, no thorough and effective method for preventing and treating viral diseases has been found at home and abroad. Therefore, various measures focusing on prevention should be adopted for comprehensive management.

(1) Select disease-resistant or disease-resistant varieties, and strictly select non-toxic propagation materials, such as roots, tubers, bulbs, bulbs, seeds, seedlings, cuttings, scions, rootstocks, etc.

(2) Take the method of shoot tip tissue culture detoxification, cultivate and propagate virus-free seedlings for cultivation.

(3) Eradicating weeds, preventing and eradicating virus-infecting insects, and reducing the source of virus infection.Spray 40-1000 times of 1500% dimethoate emulsion at the right time to eliminate poisonous insects such as aphids, leafhoppers and whiteflies.

（4）采用温热处理，消灭感病植株和繁殖材料上的病毒。一般种子可用50～55％温水浸10～15分钟；无性繁殖材料在高温条件下处理一定时间，也可取得一定的治疗效果。

(5) Strengthen cultivation management, pay attention to ventilation and light transmission, and rationally fertilize and water to promote plant growth and robustness, which can reduce virus damage.If diseased plants are found, they should be pulled out and burned in time.

(End of this chapter)