Control of Brown spot of Tulip
Symptoms: the infected leaf buds are malformed and curled, and the leaves that grow up after the tender buds are damaged become curly. If the environment is humid, a large number of gray mold conidia will be produced on the diseased tissue, which will affect the nearby healthy plants and make the leaves susceptible, so the growth of the bulb will be greatly affected.
After the flowers are injured, white or light yellowish brown spots begin to appear, then expand rapidly and wither, or turn brown and dry. Banding also appears on the pedicel, and the conidium sometimes occurs above it. Flowers are extremely susceptible to infection at every stage of the disease. There are sclerotia on the outer shell of the diseased bulb, or round or oval spots on the outer scales, with grayish yellow in the center and brown at the edge, which contains one or more sclerotia. Pathogen: grape tulip [BotrytistulipaeLind.] It belongs to the subphylum semicarpa, which is common in tulip cultivation areas, and the rainy season is more serious. Its conidiophores bear colorless or gray conidia with black sclerotia, 1-2 mm in diameter, and a flat, round or oval surface.
Route of infection: hyphae and sclerotia remain in rotting bulbs and soil to survive the winter. After planting diseased bulbs, a large number of conidia were produced on the dead buds, which was the source of infection of aboveground diseases.
Disease conditions: the bacteria can produce conidia when the humidity reaches 90% ~ 100% and 5 ℃. The disease is serious when it is low temperature in spring and wet in rainy days.
Prevention and control methods:
1. Remove the diseased bulbs before planting and carry out rotation planting.
2. Once a bud or bud showing symptoms of the disease is found, it should be removed immediately to control the development of the disease.
3. Before planting, soak the bulb in 2% formalin solution for 30 minutes, dry and plant, in order to reduce residual bacteria.
4. During the growth period, 50% prohydantoin can be sprayed 1000 times or 50% Sukeling 2000 times or 50% carbendazim 1000 times.
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Control of Tulip Black Rot
Symptoms: bulb disease. Stem disk and stem surface, sometimes on the 2nd and 3rd scales, producing irregular black-brown spots at the beginning, rough surface. Pseudomonas andropogonis (Smith)Stapp belongs to Pseudomonas bacteria. The thallus is rod-shaped, 1.9*0.8 μ m in size, and has 1 - 3 flagella. The optimum temperature for disease onset is 20~25℃, and the lowest temperature is 5℃. Pathways of infection: infected bulbs and diseased bodies in soil are the sources of infection. Control methods: try
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tulip rot sclerotinia
Tulip rot sclerotinia disease, pathogen belongs to semi-known fungus sclerotinia, mainly harm seedlings and bulbs. After the seedlings are infected, the leaflets die as soon as they are pulled out. Bulbs damaged, external scales occurred soft rot, and in the infected part and the surrounding soil surface appeared many white silk hypha, after the formation of many rapeseed sclerotia. After the formation of many sclerotia, sclerotia initially white, brown after. Pathogenesis of this disease depends on mycelium and sclerotia transmission, sclerotia winter in the soil, in high temperature and high humidity conditions, the disease occurs heavily. A, collection.
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