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Detailed Guide to Identifying Symptoms of Major Potato Diseases and Their Control Methods
I. Late blight. 1. Symptom identification. This disease is a fungal disease that affects stems, leaves and tubers. Affected parts of stems and leaves develop brown water-soaked spots, which later expand into black patches. When humid, a ring of white mold-like growth surrounds the lesions, very obvious on the underside of leaves. After tubers are affected, brown or blue lesions initially form, then expand, and the surface gradually becomes sunken, while the potato flesh beneath the lesion turns brown. 2. Control methods. Selecting disease-resistant varieties is the most economical and effective way to control late blight: such as Wushu No. 8, No. 9, No. 11, Longshu No. 3, No. 5
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Symptom Identification and Control Methods for Major Potato Pests and Diseases
The main potato diseases include: potato ring rot, potato wart disease, potato late blight, potato early blight, potato blackleg, potato bacterial wilt, and others. The main insect pests include: potato tuber moth, 28-spotted ladybird beetle, and underground pests (cutworms, white grubs, wireworms, mole crickets, etc.). Among these, three are nationally quarantined pests: potato tuber moth, potato ring rot, and potato wart disease. Main potato diseases. Potato ring rot. Field symptoms generally appear after the flowering stage, with initial symptoms showing
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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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Symptoms and Control Methods of Cherry Brown Spot Disease
Cherry brown spot disease, also known as cherry brown spot shot hole disease, is an important disease of cherry leaves. It was reported early in Japan and other countries. It occurs commonly on cherry trees in various regions of China, including Nanjing, Taiyuan, Tianjin, Shanghai, Chengdu, Xi'an, Suzhou, Jinan, Changsha, Lianyungang, Wuhan, and Taiwan, China, among other provinces and cities, with severe outbreaks in Wuhan, Chengdu, and Tianjin. Infected cherry leaves develop shot holes, which not only affects their ornamental value but also causes premature defoliation, affecting the plant's growth and development. The disease also attacks cherry, Japanese apricot, peach, and other stone fruit ornamental trees. Symptoms
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Cherry Blossom Pest Control Methods and Technical Key Points
1. Cherry blossom pests and diseases include the white peach scale (Pseudaulacaspis pentagona), various nettle moths, and the apple fruit moth (Phalera flavescens), among others. The white peach scale is mainly distributed in cherry blossom cultivation areas, occurs commonly, and is quite severe in individual fields. The damage has already caused the leaves to basically fall off, with pest populations at extremely high densities, appearing snow-white from both near and far. It is speculated that the first-instar nymph stage of the white peach scale should be around late August to early September. The first-instar nymph stage is the best time to carry out spray control. All growers should carry out coordinated prevention and control to keep the pest population base below the allowable economic level. Control method: spray during the nymph stage with Sujieke at 1000-1500
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What are the control methods for cherry blossom crown gall disease?
Cherry blossom crown gall disease is also known as crown gall. The crown gall pathogen has a very wide host range, with about 330-plus species in 142 genera across 59 families. It harms more than 600 species of plants, mainly forest plants, economic forest plants and landscape plants. Peach, plum, pear, apple, Chinese rose and cherry blossom are all highly susceptible to crown gall. Flowers and trees infected with this disease have their root development affected, often causing nutrient deficiency, showing a weakened state, and finally dying. Symptoms: It mainly occurs at the root crown and on large roots, and sometimes also on lateral roots. The main symptom is the formation of tumors of varying sizes and irregular shapes on the roots.
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Control methods for stem-boring pests damaging cherry blossoms
The stem-boring pests that damage cherry blossoms include longhorn beetles and the coffee wood moth (Zeuzera coffeeae). Their control methods are: 1. Longhorn beetles. The longhorn beetles that damage cherry blossoms usually include the citrus longhorn beetle (Anoplophora chinensis), the glossy green longhorn beetle (Anoplophora glabripennis), and the peach red-necked longhorn beetle (Aromia bungii). ① Citrus longhorn beetle. One generation occurs per year. When adults emerge from late May to early June, capture the adults: before laying eggs, the citrus longhorn beetle adult first bites a notch about 2 mm deep and about 8 mm long in the bark in the shape of the Chinese character "eight" or "ding", then lays eggs inside it. During the peak egg-laying period in mid-to-late July, search for the notches on the trunk and crush the eggs.
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Symptom Identification and Control Methods of Crown Gall Disease in Cherry Blossoms
Cherry blossoms are distributed in China's Liaoning, Hebei, Anhui, Jiangxi, Zhejiang, Jiangsu and Guizhou; they are also widely distributed in Japan and Korea. They prefer light and deep, fertile, well-drained soil, and have weak resistance to smoke and dust, harmful gases and sea breeze. They have a certain degree of cold tolerance, a relatively shallow root system, and are easy to cultivate. Cherry blossoms bloom profusely in spring and are very beautiful. They are suitable for planting on hillsides, in courtyards, in front of buildings and beside garden paths. This disease is a common and serious disease of cherry blossoms, occurring widely in areas where cherry blossoms have been introduced. Zhengzhou, Chengdu, Hangzhou, Jinan, Wu
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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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Symptoms and control methods of tulip southern blight
Symptoms: The whole plant wilts, with white mycelial strands or rapeseed-like tan-brown small sclerotia wrapped around the stem base, and the affected parts turn brown, rot and decay. Large amounts of white mycelial strands and tan-brown fungal bodies are visible on the soil surface. Pathogen: Sclerotium rolfsii Sacc., called southern blight, belongs to the Deuteromycotina fungi. The hyphae are white and silky, spreading in a fan-like or radial pattern, then gathering into mycelial strands or tangling into sclerotia. The sclerotia resemble rapeseeds, initially white to yellowish-white, later turning tan-brown, round, with a smooth surface. In addition, it has been reported that Corticium rolfsii
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