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Occurrence of Tulip Diseases and Integrated Control Methods
Tulip is a perennial bulbous herbaceous plant of the genus Tulipa in the family Liliaceae, also known as foreign lotus, grass musk, peony lily, etc., and is one of the most popular cut flowers in the world. With the adjustment of industrial structure, many places in Jiangsu Province have formed tulip fresh cut flower bases. However, in the production process, we found that every stage may be harmed by fungal, bacterial and viral diseases, thereby affecting the normal growth of plants, reducing the quality and ornamental value of cut flowers, and in severe cases causing devastating damage. Therefore, preventing the occurrence and development of tulip diseases is the
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Occurrence Patterns and Control Methods of Cherry Brown Spot Shot Hole Disease
Symptoms: Small brown, grayish-brown, or purplish-brown spots initially appear on the leaves, gradually forming circular lesions that are non-water-soaked and opaque, with no yellow-green halo around the lesions, 2-4 in diameter, with clear boundaries and a purplish-brown outer margin. In the later stage, the center turns white or brown, slightly zonate, and the lesions die and fall off, forming irregular shot holes. 2. Occurrence patterns: The pathogen overwinters on fallen leaves and spreads by wind and rain in the following spring. The disease begins in June, with the peak period from August to September. Heavy rainfall promotes disease occurrence and epidemic, and weakened tree vigor leads to severe disease. 3. Control methods:
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Occurrence Patterns and Control Methods of Cherry Blossom Pests and Diseases
Cherry blossom belongs to the genus Prunus in the rose family (Rosaceae). It has both the subtle fragrance of plum and the gorgeous beauty of peach, with as many as several hundred cultivars. In recent years, with the demand for landscape gardening, cherry blossoms have been widely used in gardens, adding much beautiful scenery to urban landscapes. However, cherry blossoms suffer from many pests and diseases, mainly the following: 1. Cherry blossom witches' broom disease. The symptom is that many short, thin branches emerge from the affected parts, resembling a bird's nest. On these branches, either no flowers or only a few flowers are produced, and the leaves on the branches are numerous and small. Each year, deformed branches increase at the affected parts.
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Occurrence and Control of Carnation Damping-off
The pathogen of this disease is called Thanatephorus cucumeris, a fungus of the phylum Basidiomycota. Its asexual state is called Rhizoctonia solani, a fungus of the class Deuteromycetes. The pathogen mainly overwinters in the soil as sclerotia or mycelium along with diseased plant residues, and can live saprophytically in the soil for 2-3 years. After being spread by water flow and farm tools, the pathogen directly invades the host. Sowing too deep, relatively high temperatures, and excessively wet soil easily induce this disease, and it is also prone to occur under open-field cultivation. It is especially severe in continuous cropping fields during warm and rainy seasons. Symptoms are also called stem rot and basal rot. It begins at the stem base near the ground, producing dark brown oval or irregular water-soaked
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Occurrence and Control Methods of Carnation Viral Diseases in Protected Cultivation
Symptom Identification Carnation Vein Mottle Virus Disease When carnation is infected by Carnation vein mottle virus, it infects carnation, China pink (Dianthus chinensis) and American pink (Dianthus barbatus), all producing systemic mosaic, and in winter the old leaves often show symptom masking. Discolored spots appear on the petals, and the symptoms are especially obvious on red large-flowered cultivars. Carnation Latent Virus Disease After carnation is infected by this virus, it generally shows no symptoms, or has mild mosaic symptoms. But when Carnation latent virus and Carnation vein mottle virus infect together, mosaic symptoms are produced. Carnation
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Occurrence and Control Methods of Major Diseases, Insect Pests and Rodent Pests of Lilies
Lily, also known as night lily, mountain lily, Zhongpeng flower, etc., is a plant that combines medicinal, edible and ornamental uses, with a large market demand. Lily is also a traditional export specialty of China and is planted throughout the country. However, with the expansion of lily planting area, diseases, insect pests and rodent pests have become increasingly serious, becoming the main factors restricting stable and high yields of lilies. The occurrence and control methods of the main diseases, insect pests and rodent pests of lilies are introduced as follows: 1 Main diseases and control 1.1 Main diseases There are many kinds of lily diseases, but fungal diseases such as gray mold and Fusarium wilt are the main ones.
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Occurrence Patterns and Control Methods of Lily Leaf Blight
Lilies originate from the eastern and central regions of China. They are relatively cold-tolerant, prefer strong light, and do not tolerate shade. Insufficient light will affect growth and flowering. A well-drained sandy loam rich in organic matter is suitable. Their disease resistance is poor, and they are susceptible to disease under high temperature and high humidity conditions. Lily plants are upright and elegant, with large, brightly colored flowers and many varieties. They are suitable for planting in patches or clumps at the edges of lawns or for forming flower borders, creating a quiet and harmonious effect. Lilies are also treasures for potted flowers and cut flowers. Lily leaf blight, also known as lily gray mold, affects the plant's photosynthesis, hinders growth, and reduces ornamental value. When the disease occurs severely,
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Occurrence Patterns and Control Methods of Black Spot Disease in Impatiens
Black spot disease of Impatiens is an important disease in the production and cultivation of Impatiens. It occurs commonly in our country and causes serious damage, so it should be taken seriously. Symptoms: The disease damages leaves, especially the older leaves in the middle and lower parts, which are susceptible to infection. Affected leaves develop circular or oval spots that are dark brown, 2-10 mm in diameter, with inconspicuous concentric rings and darker edges. When the disease is severe, the spots can expand and merge into patches, and on the spots appear pale green or olive-black mold-like growth, which is the pathogen's conidiophores and conidia. This causes the diseased leaves to shrivel and die.
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Occurrence and Control Methods of Brown Spot Disease in Rhododendrons
Brown spot disease is a common leaf spot disease of rhododendrons. It occurs fairly commonly throughout the country, and is especially severe in Guangzhou, Suzhou, Nanjing, Lianyungang, Wuhan, Hefei, Shenyang and other places. Besides harming rhododendrons, this disease also harms other plants of the genus Rhododendron. Symptom characteristics: Brown spot disease mainly occurs on the leaves. Initially, small reddish-brown spots appear on the leaf surface. They then gradually expand into nearly circular lesions, or polygonal lesions due to restriction by the leaf veins. The lesions are 2-5 mm in diameter and dark brown; in the later stage, the center of the lesion turns yellowish-white to grayish-white, with a dark brown edge (varying by variety).
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A Detailed Guide to the Occurrence and Control of Spruce Red Blight
In recent years, with the increase in the number of spruce plantings, spruce red blight has occurred severely, reaching as high as 50% in some dense forest belts, seriously weakening tree vigor and even causing tree death. The disease strikes swiftly, developing from the lower part of the tree to the upper part, from the outer edge of the crown toward the inner part, and from the base of the compound leaves toward the tip. In as little as 1 week, or at most 10 days, it can cause the leaves of the entire plant to turn yellow and then drop. The disease is caused by fungi. When temperature changes abruptly and humidity increases, the tree becomes diseased. Diseased leaves first develop small brown spots, which then expand and turn dark brown; when it rains and is humid,
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