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Causes of Potato Degeneration and How to Prevent It
(1) Causes of Potato Degeneration When potatoes are planted in spring in the hot summer regions of the south, after one or several years the yield gradually declines, and there may even be no harvest at all; this phenomenon is called potato degeneration. The direct external cause of potato degeneration is damage by viruses. Common ones in the south include mosaic virus, leafroll virus, common mosaic virus and spindle tuber viroid. These viruses are transmitted through mechanical friction, aphids, leafhoppers or soil nematodes and other vectors, infecting the plants and causing degeneration. High temperature is the indirect external cause of potato degeneration.
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Symptom Identification and Prevention Methods for Potato Cold Injury
During plant growth or during tuber storage, if the air temperature or soil temperature is too low (above freezing), the plant will suffer cold injury. The degree of cold injury varies with the temperature. 1. Leaf symptoms At the seedling stage, after the plant suffers freezing injury, the leaves quickly wilt and collapse. When the temperature becomes warmer, the affected parts become water-soaked and turn brown after dying. However, if the plant suffers only cold injury, the above symptoms will not appear. Cold injury occurs at the seedling stage in early spring. The symptoms appear at the top of the seedlings, showing light yellow to light brown at the base of the young leaves. When
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Pollution-Free Fish Disease Prevention and Control Methods and Technical Key Points
Animal-Plant Symbiosis: Aquatic plants and fish coexist in the same pond, and the fish rarely get sick. The aquatic plants planted in the fish pond are rice or lotus root, oriented east-west, with a wide row spacing (greater than 33 cm), occupying no more than 50% of the total water area, so that the lighting effect is good. The water depth depends on the water tolerance of the aquatic plants; rice is generally within 30 cm, while lotus root can generally reach over 50 cm. The farmed fish can be conventional or famous, special, and excellent new varieties. The farming method can be fry rearing or grow-out fish farming. Because residual bait, fish feces, and other matter deposit at the bottom of the pond, ferment, and rot, not
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Cyanobacteria in mussel ponds tend to overproliferate in midsummer; pay attention to prevention and control
Summer has high water temperatures and strong light, making it a season of high cyanobacteria incidence. Once cyanobacteria proliferate heavily on the water surface, the water quality becomes lean; after pearl mussels ingest cyanobacteria, it is not easy for them to digest (cyanobacteria have thick cell walls), and cyanobacteria adhere to the mussels' gills, affecting respiration. At the same time, after cyanobacteria die, protein decomposition produces hydroxylamine, which combines with toxic substances such as hydrogen sulfide in the water and can poison the pearl-culturing mussels to death. Therefore, in summer, the excessive proliferation of cyanobacteria must be strictly controlled, with targeted prevention and treatment. 1. Summer temperatures are high, and at the bottom
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Diagnostic Methods and Prevention Principles for Pig Poisoning
Physiological disorders caused by poisoning can hinder pig growth and development or even cause death, resulting in significant economic losses. Understanding the diagnostic and prevention principles for pig poisoning helps reduce the occurrence of pig poisoning and the losses caused by it. (1) Diagnosis of pig poisoning 1. History investigation. Understand the types of feed, storage and processing conditions, and analyze whether the feed may be moldy or spoiled; investigate whether the pigs have come into contact with or accidentally ingested toxic plants, rat poison, pesticides, chemical fertilizers, factory wastewater and other toxic substances, and whether recently
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How to prevent and treat black disease in sheep? Detailed explanation of key technical points for prevention and treatment
Black disease in sheep, also known as infectious necrotic hepatitis, is an acute, highly fatal toxemia of sheep. Both sheep and goats can be affected. Expert disease analysis: (1) Pathogen: The pathogen of this disease is Clostridium novyi type B, a Gram-positive, large bacillus with bluntly rounded ends, mostly occurring singly or in pairs, with a few 3-4 organisms forming short chains. Its toxins can be classified into types A, B, and C. (2) Epidemiological characteristics: It mainly occurs in spring and summer in low-lying, damp areas where liver flukes are prevalent. Clostridium nov
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How to prevent and treat bacterial endometritis in cattle and pigs
Metritis in livestock such as cattle and pigs is mainly inflammation of the endometrium, hence it is called endometritis. Endometritis is usually a mucous or purulent inflammation of the uterine mucosa. Myometritis and perimetritis, however, can occur only in acute postpartum metritis and are also very rare. Endometritis is an extremely common reproductive organ disease in female livestock, and is divided into acute and chronic forms. Acute cases all occur postpartum, secondary to infection by pathogenic bacteria during dystocia, uterine prolapse, or retained placenta; chronic cases mostly develop from acute ones, or result from infection at breeding. When female livestock develop
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How to prevent and treat sulfonamide poisoning in ducks?
Sulfonamides are a class of drugs with a relatively broad antibacterial spectrum, capable of inhibiting most Gram-positive and Gram-negative bacteria, and they also have an anticoccidial effect, making them a commonly used drug in poultry. However, improper use can cause poisoning. 1. Causes: When using sulfonamides, an excessive dosage or a overly long treatment course may lead to poisoning. Sulfonamide drugs at a concentration exceeding 0.2% in drinking water and feed are toxic to ducks. Also, those allergic to sulfonamides, or those who accidentally take an excessive single dose, or those whose treatment course exceeds 1 week are all prone to poisoning.
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Detailed Explanation of the Causes and Comprehensive Prevention and Control Measures of Swine High Fever Syndrome
Recently, many pig farms have consulted about the causes and prevention and control technical issues of swine high fever syndrome. Based on my own practical experience, the author puts forward some views for your reference. Causes: Swine high fever syndrome is essentially a swine disease caused by mixed infection of multiple viruses, bacteria, and protozoa triggered by immunosuppressive swine diseases. Biological factors: classical swine fever virus, circovirus, porcine reproductive and respiratory syndrome virus, pseudorabies virus, Eperythrozoon, Toxoplasma, Streptococcus, Salmonella paratyphi, Mycoplasma, Actinobacillus pleuropneumoniae, Haemophilus parasuis, Pasteurella, etc.
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How to Prevent and Treat Favus of Fowl? A Complete Guide to Methods and Key Points
Favus of fowl is a chronic fungal skin disease of chickens, characterized by yellowish-white, scaly scabs forming on the featherless areas of the head, especially on the comb; in severe cases, the lesions can also spread to feathered areas. A. Preventive measures: Pay attention to quarantine to strictly prevent the introduction of this disease. Isolate diseased chickens; severely affected chickens should be culled, while mildly affected ones should be treated. B. Treatment methods: For treatment, iodine glycerin or formalin ointment can be used (1 part formalin, 20 parts petrolatum; melt the petrolatum, then add the formalin, and shake well in a glass bottle).
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