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Symptom Identification and Control Methods of Ginger Anthracnose
Ginger anthracnose. On infected leaves, nearly circular or irregular water-soaked chlorotic lesions first appear mostly from the leaf tip or leaf margin, later joining together into irregular large patches; in severe cases the leaves may dry up. When humid, small blackish, slightly rough granular dots grow on the lesions, namely the pathogen's acervuli. The disease can also attack stems and leaf tips, forming short stripe-shaped lesions on stems and leaf tips that likewise bear small black dots; in severe cases the leaves may droop but remain green.
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How to Propagate Lotus Root? A Detailed Explanation of Several Common Methods
-- Lotus seed propagation. Since lotus seeds are covered with a hard shell, first crack open the sunken end of the shell, then soak it in water at 26-30°C to promote germination. Once the sprout emerges, it must still be kept submerged in water to prevent dehydration and shriveling; when it grows to 4 leaves and 1 rhizome runner, it can be planted out in the field. Because lotus seed propagation grows slowly in the early stage, seedlings must be raised in a protected area 1 month in advance so that lotus roots of commercial value can form in the same year. -- Whole lotus root propagation. Plant the entire main lotus root together with its daughter roots and granddaughter roots at a certain row and plant spacing; the planting method is to insert the top end into the mud, with the tail tip exposed
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Occurrence Patterns and Control Methods of Viral Diseases in Solanaceous Crops
In the southern Guangxi region, the winter climate is warm with no obvious frost, making it a great place for growing winter vegetables to be shipped from the south to the north. Therefore, after harvesting the late rice, farmers grow winter vegetables to supply the market after the Spring Festival, achieving relatively high economic returns and writing a new chapter of "the plan for the year lies in autumn and winter." This has become another way for local farmers to get rich and move toward a moderately prosperous life. Among the many vegetable varieties grown, solanaceous vegetables (tomato, pepper, eggplant) are favored by local farmers for their unique planting advantages. According to statistics, the perennial planting area is around 80,000 mu, and the planting area is predicted to keep rising year by year.
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Prevention Methods and Technical Key Points for Diseases of the European Eel
(1) Do a good job of water disinfection, using effective drugs and methods to kill parasites, viruses and bacteria in the water: ① Evenly splash the whole pond with 0.3 g/m3 (cubic meter) Yuchongqing No. 2 once every 6 days, to kill parasites and eggs in the water and prevent dactylogyrosis; ② Splash the whole pond with 0.2 g/m3 of chlorine-rich disinfectant once every 6 days, to kill viruses and bacteria in the water; ③ Splash the whole pond with 0.3 g/m3 of Manjing once every 6 days, to kill bacteria, fungi and protozoa in the water. Note: the above three
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Breeding Techniques and Management Methods for Adult Snakehead Fish
Snakehead fish is a valuable freshwater fish of high economic value, known as the "treasure among fish." It is highly nutritious and contains a large amount of protein, more than that found in chicken and beef. From a nutritional standpoint, snakehead fish is a premium health food that is nutritionally complete and has delicious meat. Breeding adult snakehead fish refers to the production process of raising fingerlings into food fish in small water bodies such as ponds, tanks and cages. Artificial snakehead fish farming includes two types: extensive polyculture and intensive monoculture. Extensive polyculture means raising them together with the Four Major Chinese Carps and other fish in a fishing pond. Intensive mono
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Diagnostic Methods and Technical Key Points for Newcastle Disease in Chickens
Since Newcastle disease (ND) was recognized in 1926, many countries have regarded ND as an endemic disease. Except for a few countries that produce poultry at a commercial level, all countries carry out preventive immunization. One of the most characteristic properties of different strains of chicken Newcastle disease virus (NDV) is that their pathogenicity to chickens varies greatly. Based on the clinical symptoms caused in infected chickens, NDV strains can be divided into 5 groups or pathotypes, which are: the viscerotropic velogenic type, characterized by high pathogenicity, with intestinal hemorrhagic lesions commonly seen;
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Symptoms and control methods of cotton boll Aspergillus rot
Symptoms It occurs in all cotton regions. It mainly damages cotton bolls. Initially, water-soaked yellowish-brown spots appear at cracks, insect holes, wounds or splits on the cotton boll, followed by yellow-green or yellowish-brown powdery material that fills the boll cracks, causing the cotton boll to fail to open normally. During continuous rainy weather or high humidity, yellowish-brown or yellow-green fuzzy mold grows, namely the pathogen's conidiophores and conidia, and the cotton lint quality is contaminated to varying degrees or becomes dry-rotted and deteriorated. Pathogen Aspergillus flavus Link, called yellow aspergillus, Aspergillu
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Key Technical Points and Correct Methods for Applying Boron to Cotton
In recent years, statistics from cotton boron fertilizer trials in various regions show that on boron-deficient soils (soil available boron below 0.5 mg/kg) and potentially boron-deficient soils (soil available boron below 0.8 mg/kg), applying boron fertilizer to cotton can achieve good yield increases. 1. Base fertilizer: Apply before cotton sowing or before transplanting nutrient (pot) seedlings, incorporated during land preparation. Apply about 0.5 kg of borax per mu, which can be mixed evenly with fertilizers such as nitrogen, phosphorus and potassium and applied together, or mixed with fine dry soil before application. 2. Seed fertilizer: At cotton
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Causes and Control Methods of Azalea Chlorosis
Azalea chlorosis is a non-infectious disease and also a common disease in azalea cultivation. After the plant is affected, the leaves become thinner, lose their green color, and turn pale, so this disease is also called chlorosis. The lack of green is obvious in new leaves. When the color of new shoot leaves becomes lighter and the leaf mesophyll turns yellow while the veins remain green, it is generally diagnosed as iron deficiency symptoms. This phenomenon mostly occurs in alkaline soil and in areas where slightly alkaline water is used to water flowers. After symptoms appear on the leaves, photosynthesis cannot proceed normally. In mild cases, it affects the growth and development of the plant
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Detailed Methods for Controlling Pests of Tropical Orchids (Part Two)
5. Whiteflies. Whiteflies are pests of the family Aleyrodidae in the order Homoptera. The insects are relatively small, with white powdery waxy material covering the whole body, and they usually cluster on orchid plants. They are prone to occur when ventilation in the orchid greenhouse is poor. They often damage the new shoots, tender leaves and flower buds of orchids. When causing damage, they insert their piercing-sucking mouthparts from the underside of the leaves, sucking the sap from the plant tissues, causing the leaves to turn yellow and withered, and they often excrete large amounts of honeydew at the wound sites, causing sooty mold and the occurrence of brown rot, and even causing the death of the entire plant. Because whiteflies have strong reproductive capacity, they can reproduce 9~10 generations within a year in a greenhouse, and can form a huge
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