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Proper removal of silkworm excrement can effectively reduce the occurrence of silkworm diseases
Silkworm excrement not only harbors the pathogens of viral flacherie, but is also a breeding and transmission site for the pathogens of many silkworm diseases such as empty-head soft rot, bacterial soft rot, and muscardine. Data show that when pathogen-carrying silkworm excrement from spring-reared silkworms is left for 15 days and then comes into contact with mulberry leaves, it can cause the incidence of midgut-type viral flacherie in silkworms that eat those leaves to reach 75%; when pathogen-carrying silkworm excrement from late-autumn-reared silkworms is left for 1 day and then comes into contact with mulberry leaves, it can cause the incidence of midgut-type viral flacherie in silkworms that eat those leaves to reach 60%, and after 7 days the incidence reaches 100%. Therefore, during routine rearing,
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Potato Disease Prevention and Control Methods and Key Technical Points
Disease is one of the important factors affecting the yield and seed quality of winter potatoes. The main diseases of winter potatoes in Yunnan Province and their prevention and control methods are introduced as follows: Virus disease prevention and control methods: select virus-resistant varieties and virus-free seed potatoes; pull out diseased plants in the field; control aphids in a timely manner. Fungal diseases: first, late blight. Prevention and control methods: select disease-resistant varieties and disease-free seed potatoes; promptly pull out central diseased plants and carry out intertillage and weeding; chemical control. Second, early blight. Prevention and control methods: select disease-resistant varieties; chemical control. Bacterial diseases: ring rot prevention and control methods: select
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Rice Major Pests and Diseases in Gejiu City: Occurrence and Control Methods
I. Rice Planthoppers 1. Damage characteristics: Rice planthoppers, also known as white gnats, are migratory pests with the characteristics of long-distance migration and outbreak damage. The common species include the smaller brown planthopper and the white-backed planthopper. They occur in all rice-growing areas of the city, mainly damaging rice, followed by wheat and corn, and also parasitize grasses such as Chinese sprangletop and other gramineous weeds. Adults and nymphs gather in clusters at the base of rice clumps and on leaves to suck sap. The damaged parts show elongated brown spots, and in severe cases the lower stems turn black and the entire plant dies.
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How to prevent and treat common diseases in ayu (sweetfish) farming?
I. Vibriosis 1. Pathogen: mainly Vibrio anguillarum. 2. Symptoms: depending on the species of Vibrio infecting the fish, it can be roughly divided into three types: yellow-liver type, pointed-intestine type and ulcerative type. Sick fish swim weakly, have darkened body color, protruding eyeballs and skin hemorrhages that in severe cases extend deep into the muscle layer; there is congestion and then ulceration on the inner surface of the operculum, the base of the fins and the tip of the snout; the anus is red and swollen; the gills are pale; the liver of sick fish is enlarged, in some cases entirely faded to a yellowish-earth color, in others partially faded and congested; blister-like structures filled with bloody fluid appear in the liver of sick fish; the gallbladder is enlarged, and the
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Common Disease Prevention and Treatment Methods and Key Technical Points for Fish and Crabs
I. Grass carp hemorrhagic disease. Symptoms: bleeding in the fins, mouth cavity, eye sockets, muscles, and intestines, partially or entirely bright red. Prevention and treatment: 1. Broadcast dibromohydantoin or chlorine dioxide over the entire pond, using 200 grams of dibromohydantoin or chlorine dioxide per 1 mu of water surface at a depth of 1 m. Apply once more after 2-3 days. 2. Mix into bait and feed Yu'erkang, mixing 1 kg of Yu'erkang per 50 kg of feed, and feed continuously for three days. 3. Mix into bait and feed Suke, mixing 50 grams of Suke per 50 kg of feed, feeding once a day for three days as one treatment course. If combined with external application of dibromohydantoin,
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Analysis of Neurological Symptom Diseases Caused by Calcium-Phosphorus Metabolism Disorders in Chickens
Strictly speaking, the neurological symptom disease caused by calcium-phosphorus metabolism disorders should be described as chondropathy (rickets/osteomalacia). It is characterized by deformation of the keel bone, weak expansion of the ribs, and legs that are brittle and easily broken. Affected chickens walk weakly and have difficulty breathing, and when held, they show no struggling response. It is commonly seen in chicks and also readily occurs in various caged chicken flocks. Besides an imbalanced calcium-to-phosphorus ratio, deficiencies of vitamin A and D3 are also among the causes of calcium-phosphorus metabolism disorders. The most common lesions found on pathological necropsy are vertebral hyperplasia of the ribs and severe deformity at the junction of the ribs and cartilage. Supplementing the feed with vitamins and calcium carbonate can quickly reverse these symptoms.
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Detailed Explanation of Disease Prevention and Control Strategies for 4- to 6-Week-Old Chickens
1. Lock down and isolate the brooding area to prevent disease transmission via personnel, supplies, vehicles, other chicken flocks, and other routes. Maintain hygiene inside and outside the chicken house; persist with disinfecting the chickens in place and disinfecting the environment outside the house. When no live vaccine immunization is being carried out, ensure disinfection twice a day to reduce the pathogen load in the environment. 2. At this stage, the flock transitions from having a preliminary ability to regulate body temperature to being fully able to regulate body temperature. Therefore, in the relationship between temperature and ventilation, it should gradually shift from prioritizing warmth during 0 to 3 weeks to placing equal emphasis on temperature and ventilation, and finally to prioritizing ventilation. In the later period
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How to observe and diagnose sheep diseases? These six methods you need to know
Inspection is the direct observation of the sheep's mental state and the various abnormal changes it presents. Healthy sheep generally compete for feed, move at the same speed, and react quickly; sick sheep often lag behind the flock, stop eating, stand still, or lie down. Posture: healthy sheep have bright, spirited eyes and move lively and steadily; when sheep are sick they often show unsteady movement or are unwilling to walk, and some infectious diseases also present special postures, such as tetanus manifesting as stiff limbs, and sheep with coenurosis (brain tapeworm cysts) or sheep nasal bot fly turning in circles, and lameness. Body condition: generally, in cases of acute anthrax, sheep bradsot (fast disease), sheep black disease, sheep (sheep sudden death), sheep enterotoxemia, etc., the sick sheep's body may still appear fat and strong; on the contrary, when generally suffering from chronic infectious diseases and parasitic diseases, sick sheep are mostly thin and weak.
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Sheep "craving green grass" disease occurs frequently in spring, sheep farmers must prevent it in advance
"Craving green grass" is also a disease; beware of sheep "craving green grass" disease in spring
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Cultivation Techniques and Pest and Disease Control Methods for Leafy Goji (Vegetable Goji)
When people think of goji, they picture the bright red goji berries, and few know there is also a leafy goji whose tender leaves can be eaten. Leafy goji is a deciduous shrub in the Solanaceae family, with a plant height of 1 m. The branches are slender, long, curved or drooping; young branches are angular, gray on the outside, hairless, usually with short thorns borne in the leaf axils. Leaves are alternate or clustered on short shoots, with leaf blades ovate, ovate-rhombic or ovate-lanceolate, and entire. Flowers are usually 1-4 clustered in the leaf axils; the calyx is bell-shaped; the corolla is funnel-shaped, pale purple, with ciliate margins, and deeply 5-cleft
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