Occurrence and control of carnation virus disease in protected area

Symptom recognition

Carnation leaf vein mottle disease

Carnation vein mottle virus infects carnation, Chinese carnation and American carnation, all produce systematic mosaic, and old leaves often appear occult phenomenon in winter. Discoloration spots appeared on the petals, especially in the varieties of large red flowers.

Carnation latent virus disease

Carnation generally shows no symptoms or mild mosaic symptoms after being infected by the virus. However, mosaic symptoms occurred when carnation latent virus and carnation vein mottle virus were co-infected.

Carnation necrotic spot

After the carnation was infected by carnation necrotic spot virus, there were grayish white, yellowish necrotic mottled, or irregular stripes and stripes on the leaves in the middle of the carnation plant. The symptoms of the leaves in the lower part of the plant were the same as those in the middle, but the necrotic spots were purplish red. When the disease is serious, the whole leaf withered and necrotic.

Carnation erosive ring disease

Carnation erosion ring disease mainly affects the leaves of carnation. The necrotic spots of wheel, ring or wide stripe are produced on the leaves of carnation varieties. These symptoms were more obvious when they were co-infected with carnation vein mottle virus and carnation vein mottle virus. The symptoms of carnation in seedling stage are obvious, and there are hidden symptoms in high temperature season. When the disease is serious, many gray-and-white wheel spots converge into large disease spots, and the leaves are curled and deformed.

Morbidity regularity

Carnation leaf vein mottle disease

Carnation vein mottle virus is the pathogen of the virus. It can be transmitted by juices or by peach aphids. Tools and hands can also transmit the virus during horticultural operations (such as cutting flowers, picking buds, pruning, etc.). Seedlings with virus can be transmitted over a long distance. The occurrence of leaf vein mottle disease is closely related to the peak of aphid population. After the peak of aphid population, leaf vein mottle disease occurred seriously.

Carnation latent virus disease

Carnation latent virus is the pathogen of the virus disease. It can be transmitted by juices or non-persistent by peach aphids. The virus infects carnation, American carnation, carnation, Baibin carnation and other plants.

Carnation necrotic spot

Carnation necrotic spot virus is the pathogen of necrotic spot disease. Non-persistent transmission by peach aphid can also be transmitted by juice, but the success rate of juice inoculation is very low. Carnation necrotic mottle virus can also infect American carnation and other plants.

Carnation erosive ring disease

Carnation ectoplasmic ring virus is transmitted by juice and grafting, and can also be transmitted non-persistently by peach aphids. Tools and hands can also be spread in the process of gardening operation. Excessive density of carnation planting causes mutual friction between diseased and healthy leaves, which can aggravate the occurrence of the disease. Etch ring virus not only infects carnation, but also infects American carnation, Danish carnation and other plants. The plants of the genus soapy are extremely sensitive to the infection of eroding ring virus.

Prevention and control measures to strengthen quarantine and control the occurrence of diseases.

The tissue culture seedlings of carnation imported from abroad should be strictly quarantined, and the poisonous seedlings should be thoroughly destroyed or treated before planting. Establish a virus-free mother garden for sampling and breeding

Taking the stem tip of 0.2~0.7mm from healthy plants as the material of virus-free tissue culture, the survival rate of tissue culture seedlings was high, and the virus-free rate was also high. Improve the maintenance and management to control the spread of diseases and set up the mother source nursery and the cut flower production nursery separately to ensure that the provenance nursery will not be infected again. Pruning, cutting flowers and other operating tools and manpower must be repeatedly washed and disinfected with 3% to 5% trisodium phosphate solution, alcohol or hot soap water, so as to ensure a better sanitary environment for large-scale commodity production in carnation cut flower beds.

Chemical control

To treat aphids and prevent diseases, spray 20% virus A wettable powder 500 times, or 1.5% Zhanling water 800-1000 times, or 83 resistance enhancers 100 times. Spray once every 10 days for 2 or 3 times.