Blight of carnation
The pathogen of the disease is called Cucurbitaceae, which belongs to basidiomycetes. Its asexual state is called Rhizoctonia solanacearum, which belongs to semi-known fungi. The pathogen overwintered mainly as sclerotia or mycelium in the soil with the disease residue, and could saprophyte in the soil for 2-3 years. The pathogen directly invaded the host after spreading through water flow and farm tools. The disease is easy to be induced by deep sowing, high temperature and too wet soil, and it is also easy to occur when cultivated in open field. The disease is serious, especially in the warm and rainy season.
The symptoms are also known as stem rot and basal rot. At the beginning, dark brown oval or irregular waterlogged disease spots appeared at the base of the stem near the ground, and then sticky wet rot or soft rot occurred, and the leaves gradually became grayish white. When the disease part formed annular rot, the whole plant suddenly wilted, causing a large number of cutting seedlings to die. When the humidity is high, filamentous hyphae or small brown sclerotia appear on the soil surface of the diseased part or root neck.
Prevention and control methods (1) disinfection of seedling bed or seedling basin. Spray 20% methyl Likuling EC 1200 times or 95% Luheng 1 3000 times solution in the sifted 50-60 ┧ matrix, spray and mix well, cover with plastic for 2-3 days, then fill the substrate back to the seedbed, water and cut or sow seeds. (2) the suitable cutting depth is 10 ┨, the cutting medium should be permeable, the suitable soil temperature and humidity should be maintained after cutting, and the soil permeability should be enhanced by light watering to promote the rapid growth of seedlings so as to reduce the disease. (3) the cultivation method of shelter from rain was adopted. (4) spray 1200 times of 20% methyl Likuling EC or 95% of Luheng No. 1 3000 times immediately after the disease, or leach in the soil with pentachloronitrobenzene powder 500g in water 400L during the onset of the disease. (5) the occurrence of the disease can be effectively inhibited by pouring Trichoderma nutrient solution into the nursery soil before cutting or transplanting.
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Control of Botrytis cinerea in Carnation
Gray mold of carnation, also known as carnation blight, is a common disease of growing carnation in greenhouse and greenhouse. The disease harms the petals of the plant, causes brown spots and rot on the petals, and seriously affects the quality of cut flowers. Symptoms: the disease mainly occurs on petals and buds, and occasionally occurs in stems and leaves. At the beginning of the disease, the susceptible flowers began to appear light brown water stains from the edge of the petals, and then several petals were entangled by gray fungi. In the later stage of the disease, if the environment is wet and the petals rot, gray appears on it.
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Fusarium wilt of carnation
Fusarium wilt of carnation occurs in all the planting areas of carnation, and the damage is common. [pathogen] Fusariumoxysporumf.sp.dianthi (prill.etDel) Snyd.etHans belongs to Fusarium oxysporum and Fusarium oxysporum. [symptoms] the disease is mainly invaded by the roots of carnation and colonized in the vascular system. Chlorosis, yellowing, browning and wilting occur in the lower leaves or stem nodes of the damaged plant, usually only on one side of the plant at first.
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