Control of three major diseases of carnation
Leaf spot, Fusarium wilt and virus disease are the main diseases of carnation. The control methods are as follows:
Leaf spot mainly infects leaves, and the disease mostly starts from the lower leaves. The seriously diseased part of the plant was twisted, and the diseased leaves withered and hung upside down on the stem, but did not fall off. The disease of old leaves is more and more serious than that of new leaves, and the disease of open field cultivation is more than that of greenhouse. Prevention and treatment methods: from the initial stage of the disease, regular spraying; immediately after picking buds and cutting flowers, fungicides should be sprayed to protect them. It can be sprayed with 75% chlorothalonil wettable powder 800 to 1000 times. In addition, drainage should be paid attention to in rainy season, and greenhouse cultivation should be ventilated and transparent.
Fusarium wilt can occur throughout the growth period, resulting in plant wilt, leaf and stem discoloration, showing straw color. Cross-cut the diseased stem, showing a brown ring. In the high temperature season, the development is extremely rapid and the harm is serious. Control method: treat the soil with 58% benzoate 1000 times, or irrigate the soil with 50% carbendazim wettable powder and 50% carbendazim before planting. During the growth period, the diseased plants should be removed in time and destroyed; pay attention to drainage and waterlogging prevention, as far as possible to avoid damage to the root system of carnation, in order to reduce the invasion of bacteria.
Virus diseases often cause carnation growth weakening, flowers becoming smaller, petals mixed color, bud cracking and other symptoms.
Prevention and control methods: strictly implement the quarantine system to prevent the disease from spreading to disease-free areas. Carnation virus diseases are mostly transmitted by aphids. Insecticides such as omethoate, malathion or aldicarb can be sprayed to control the spread of the disease. Diseased plants should be removed and destroyed in time.
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Carnation
English name: Dianthuscaryophyllus carnation, also known as carnation, is an evergreen perennial herb of the family Caryophyllaceae. Cut flowers are often planted in one or two years. It is the most popular cut flower in the world, second only to chrysanthemum, accounting for about 17% of the total cut flower production. In all indoor cut flower production, carnation has the highest output per unit area, which can be mechanized and automated for large-scale production. Therefore, the price of carnation is relatively low. Carnation is widely used.
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Carnation white silk disease
Shanghai, Hangzhou. [symptoms] the disease occurs at the base of the stem near the soil surface and turns brown and rotten; the diseased stem tissue is cut and tea-brown or dark-brown rot develops to the center from the outside; the xylem also changes color upward, and the pinnately radiating white hyphae can spread to the surrounding soil surface; then sclerotia the size of initially white and later yellowish-brown rapeseed is formed on the diseased part and surrounding soil surface mycelia. After the plant is susceptible to disease, the whole plant usually loses and dies. On the cutting bed, wet rot occurs from the healing and forming area of the cuttings, which can also cause serious roots.
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