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Control Methods for Premature Senescence in the Late Growth Stage of Cotton
The internal cause of late-stage premature senescence in cotton is that after cotton growth enters August, intense competition for nutrients arises among the roots, stems, leaves, and bolls, leading to an imbalance between nutrient supply and demand; the external causes are insufficient water and fertilizer in the cotton field during the late stage, such as phosphorus or potassium deficiency; in some cotton fields, it is also because of too many pesticide sprayings in the late stage, or excessive pesticide concentration, which causes serious damage to cotton leaves. It should be pointed out that the fundamental measure to prevent premature senescence in cotton is to start with strengthening the basic construction of the cotton field, that is,
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Control methods for diseases, pests and weeds during the cotton sowing period and seedling stage
This year, affected by abnormal climate, the cotton sowing time in our province was delayed. Under this continuous low-temperature condition, cotton growth and development were delayed, and the degree of disease and pest damage was relatively aggravated. For this reason, the situation facing cotton disease and pest control this year is more severe. From the start of sowing, every key control technique must be firmly implemented, especially the links in pesticide selection and use. The main disease and pest control techniques for the sowing period and seedling stage are introduced to the broad community of farmers as follows: 1. Strictly control the seed treatment with pesticides at the sowing stage. Before cotton sowing, focus on
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Prevention and Control Methods and Technical Key Points for Pig Cold Diarrhea
The root cause of pig "cold diarrhea" disease has now been confirmed to be infection of pigs with transmissible gastroenteritis and epidemic diarrhea, and pigs are prone to this disease when the weather turns cold. Once a pig contracts this disease, in addition to severe diarrhea and pig death (mortality of suckling pigs can reach as high as 100%), it also seriously affects pig growth and increases the culling rate of pigs. In order to effectively control the occurrence of this disease, the pathological characteristics and prevention and control measures of the disease are introduced as follows: 1. Pathological characteristics: Porcine transmissible gastroenteritis and porcine epidemic diarrhea
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Prevention and Control Methods and Technical Key Points for Common Diseases of Large Yellow Croaker
I. Cryptocaryon irritans disease (white spot disease) Symptoms: A large number of small white spots appear on the body surface. In severe cases, the fish body is covered with a layer of white film. Due to the destruction caused by the parasites, secondary bacterial infection is triggered, resulting in inflammation and necrosis of the fish epidermis, scales easily falling off, fin rays rotting and splitting. When parasitizing the gills, it destroys the gill filaments, and after bacterial infection, it causes gill rot. When the parasites invade the fish's cornea, it causes inflammation and blindness. Diseased fish have reduced appetite, become thin, and swim erratically. The parasites can be identified by microscopic examination. Prevention
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Identification and Control Methods for Fish Lice (Argulus sp.)
Signs of Infection Fish lice are disc-shaped parasites, 8 to 12 mm in diameter, and come in various colors, from light green to brown. They can be seen attached to the fish's body and fins. Fish Affected Fish lice can infest many species of coldwater fish. They are almost impossible to find on tropical species unless the parasites are brought into the aquarium on live food or plants. Even then, fish lice cannot survive for long in warm water. Details of Infection These parasitic crustaceans have eight feathery legs,
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What to Do About Garlic Continuous Cropping? Practical Control Methods Shared
Yongnian County is a major garlic-growing county, but in recent years, continuous year-after-year garlic planting has caused physiological diseases to become increasingly severe. In addition, garlic's selective absorption of nutrients has made the problem of insufficient nutrient supply prominent, showing symptoms such as dead seedlings, root rot, anthracnose, and in the later stage some cylindrical leaves like scallion leaves, which are unfavorable for the normal bolting of garlic scapes. This not only increases the labor intensity of garlic farmers but also reduces garlic yield. Changing the garlic root environment is the key to increasing garlic income, as follows: apply "Nong Dage" or "Chongcha No. 1" biological bacterial fertilizer per mu of garlic
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Occurrence Patterns and Control Methods of Garlic Blight
I. Symptoms Garlic blight mainly damages the leaves. In the early stage of infection, pale white to light yellow water-soaked spots appear in the middle of the leaf or at the leaf tip, with light green edges. The lesions expand quickly, and within 3 to 5 days half of the leaf or the entire leaf wilts and droops. When humidity is high, the lesions rot, causing the whole plant to die. II. Pathogen and Transmission Routes The pathogen overwinters as mycelium and chlamydospores in the underground parts of diseased plants or in the soil. When conditions are suitable the following spring, the diseased parts produce sporangia and zoospores. The zoospores spread through wind, rain and irrigation water, causing primary infection and secondary infection. III
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How to identify and control jujube witches' broom? The methods explained clearly in one article
Jujube witches' broom, commonly known as "male jujube tree", is a devastating disease of jujube trees. In severe cases, it can cause mass death of jujube trees and even destroy the entire orchard. 1. Symptom identification (1) The initial symptoms appear after flowering, manifested as degeneration of floral organs and abnormal sprouting of buds; the leaves that grow out are narrow and small, forming clustered branches and leaves, and the young leaves show vein clearing, yellowing and curling into a spoon shape. (2) The leaves of diseased trees show obvious pathological changes after flowering: first the mesophyll turns yellow, then gradually the entire leaf yellows, the edges curl upward, and later the leaves become hard and brittle, dull and lusterless. (3) On the current-year vegetative shoots of diseased plants, the normal buds and
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What are the prevention and control methods for silkworm bacterial diseases?
Silkworm bacterial diseases generally occur mostly during the summer and autumn rearing seasons. They are caused by bacteria parasitizing silkworms, multiplying in large numbers, and infecting the whole body through the blood circulation, mainly through wounds and food routes. The prevention and control measures are as follows: 1. Strict disinfection. Before, during, and after rearing, use bleaching powder solution containing 1% chlorine to strictly disinfect the rearing room, rearing tools, ancillary facilities, and surrounding areas. 2. Strengthen feeding management. When feeding mulberry leaves and handling silkworms, movements should be gentle and operations should be done carefully. Expand the rearing bed frequently,
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What are the control methods for parasitic diseases of silkworms?
I. Polyvoltine flesh fly maggot disease 1 Symptoms: A black triangular diseased spot appears at the parasitic site on the silkworm, with a pale yellow fly eggshell adhering to it. 2 Control: ① Capture and kill fly pupae. ② Use "Miecanying" (silkworm fly killer) to kill maggots. For body spraying use a 300-fold dilution; for spraying on mulberry leaves to feed silkworms use a 500-fold solution. For 5th instar silkworms, apply once every other day; for the 4th instar, use 1 to 2 times; do not use before the 3rd instar. II. Acariasis (mite disease) 1 Symptoms: Young silkworms die quickly after being affected, most with head and thorax protruding, body color dull and dark; those affected during molting cannot shed their skin and die; affected large silkworms pass string-of-bead feces or irregular feces, with prolapsed anus, small hairy-legged silkworms, and various symptoms such as protruding head and thorax, curved body, and water vomiting appearing simultaneously. 2 Control: Use sulfur fumigation or spray with 300-fold "Miecanying". When disease occurs during the silkworm rearing period, find the source of mites and cut it off. Quickly change the trays, spray the silkworm bodies with "Miecanying" to repel mites. The concentration of "Miecanying" is: 1000-fold for the 1st instar, 500-fold for the 2nd instar, 300-fold for the 3rd to 5th instars, and do not pile up cotton, wheat straw, rice straw, rice grain, etc. in the silkworm rearing room.
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