wilting of carnation
[symptomatic]
The external symptoms of the disease are very similar to the Fusarium wilt caused by Fusarium oxysporum. The leaves of the diseased plants turn gray-green, then yellowed, resulting in a dead top, and the plant withered and died due to stem rupture. Looking at the central column, yellow to beige stripes can be seen. At the same time of the disease in the aboveground part, the root also disintegrated. The occurrence of the disease can be divided into two situations: the acute type develops rapidly, especially after the young plants on the hotbed are damaged, and when the damage is slight, the leaves are twisted.
[pathogen]
Pseudomonas caryophyllus [Pseudomonascaryophylli (Burkholder) StarretBurkholder] belongs to Pseudomonas aeruginosa. Gram staining was negative and widely distributed in soil. The cell is rod-shaped, about 0.8 × 2.0 (micron), moving with polar flagella.
Most of the strains produced yellowish green non-fluorescent diffusive pigment, which was more obvious in the medium of iron deficiency. Some strains have the effect of lipolysis. Specific aerobic (except in nitrate medium). The optimum growth temperature is 30-33 ℃, and some can grow even at 46 ℃.
[prevention and control methods]
Diseased plants should be pulled out and burned at any time and should not be used as compost.
Set up a disease-free breeding base. Do not plant in soil contaminated by germs. The cuttings were soaked in 1000 times of potassium permanganate or 1000 times of streptomycin.
At the initial stage of the disease, 77% can be sprayed 400-500 times of the wettable powder, or 14% ammonia copper solution 300 times, 50% copper succinate wettable powder 500 times, 1 Vlux 1 Bordeaux 200 Bordeaux, etc., once or twice every 10 days.
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Virus disease of carnation
Carnation virus disease is a worldwide disease, which occurs in all cultivated areas. The common virus diseases are leaf vein mottle disease, necrotic spot disease, erosion ring disease and latent disease. the virus often causes carnation growth weakness, short flower branches, smaller flowers, mixed petals, split calyx and so on, which seriously affect the quality and yield of cut flowers. The main results are as follows: (1) Carnation necrotic spot disease: the leaves in the middle of the susceptible plant become gray, yellowish necrotic mottled, or irregularly shaped stripes or stripes. The lower leaves often show purplish red stripes or stripes. With the plant
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Necrotic spot of Carnation
[pathogen] Carnation necrotic streak virus (Carnationnecroticfiackvirus,CaNFU), the lethal temperature was 40-45 ℃ and the in vitro survival time was 20 ℃-2-4 days. [symptoms] there are grayish white, yellowish or purplish red necrotic spots or stripes on the leaves, which are often parallel to the veins. The old leaf occurs more seriously and spreads upward. When it is serious, the whole leaf turns yellow and necrotic.
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