-
The Pathogenesis and Control Methods of Peach Tree Gummosis
Peach tree gummosis is a disease commonly occurring on peach trees today, and its incidence is severe. Especially in peach orchards with extensive management and weakened tree vigor, the rate of affected plants can reach over 90%. This disease severely weakens tree vigor, affects yield and quality, and in severe cases leads to dead branches and dead trees, threatening the production and development of peach trees. It is also one of the most troublesome diseases for fruit growers. I. Causes of peach gummosis. There are two causes of peach gummosis: one is non-infectious pathogens, such as gummosis caused by wounds from mechanical injury, pest and disease damage, frost damage, freeze injury, etc., or gummosis caused by physiological disorders of the tree body resulting from extensive management
-
How Are Russian Olive Foods Developed and Utilized? A Full Explanation of Pathways and Value
Russian olive (Elaeagnus angustifolia L.), also known as Guixiang willow, silver willow, or Qilixiang, belongs to the Elaeagnaceae family, genus Elaeagnus. It is an evergreen shrub. Russian olive is light-demanding, cold-tolerant, highly resistant to wind-blown sand and saline-alkali conditions, grows fast, has wide uses, and holds high economic value. Russian olive is distributed in Shaanxi, Gansu, Inner Mongolia, Ningxia, **, Qinghai and other places; in ** it is found in the Taklamakan Desert and along the banks of various rivers, and it is also distributed in Yili, Toksun and other places in northern **. Russian olive is a "treasure tree" of desert saline-alkali land; its edible value and medicinal value are both very high, and it has great potential for development into green foods.
-
What are the symptoms of porcine proliferative enteropathy? Detailed explanation of prevention and treatment methods
Porcine proliferative enteropathy, also known as proliferative enteritis, is a common intestinal infectious disease in growing and finishing pigs. Other names include necrotic enteritis, proliferative hemorrhagic enteropathy, porcine ileitis, terminal ileitis, and porcine intestinal adenomatosis. The clinical manifestations of the disease are mainly intermittent diarrhea, decreased appetite, and stunted growth. Growing pigs and replacement gilts sometimes have bloody diarrhea and sudden death. The characteristic finding on necropsy is thickening of the mucosa of the small intestine and ileum. The histopathological change is characterized by adenomatoid proliferation of immature intestinal cells within the crypts of the ileum and colon. The disease is endemic in various parts of the world.
-
What pathogenic effects does feed contamination have on fish?
Because some feed products currently contain bacteria at levels far exceeding the standard, mass fish deaths occur from time to time after fish eat contaminated feed. Based on the disease symptoms in fish, it can be roughly divided into two types: acute type (explosive) and chronic type. 1. Acute type (explosive type): After fish eat contaminated feed, disease onset occurs in as much as 3 to 5 days, or as little as 1 to 2 days, with symptoms appearing; severely affected fish have already died, and the number of dead fish shows a gradually increasing trend, but feeding is not affected, and most fish can eat normally. This kind of
-
Keeping mountain bees brings high returns and is a good path to increasing income and becoming better off
The mountain bee is a wild economic insect. The honey it makes from the nectar of the many flowers in nature is a fine grade of honey, and its market price can reach 30-40 yuan per kg. Generally, one bucket of mountain bees can yield about 25 kg of honey per year. If the colony is strong, the nectar source is good and the climate is suitable, each colony can produce 40-50 kg of honey. Right now is the peak period for mountain bee colony division, and bringing mountain bees home to raise them is a good project with low investment and quick results. Making and placing the bee bucket. The bee bucket is made up of a bottom bucket, an extension bucket, a bucket bottom and a bucket cap (lid)
-
Basic Methods and Procedures for Diagnosing Chicken Diseases: Laboratory Pathological Diagnosis
Take the typical tissues and organs of a dead chicken, cut them into pieces 1.5-3mm x 5mm in size, soak the tissues in 10% formalin solution or 95% alcohol for fixation, then section and stain the fixed tissue samples, and examine the pathological changes under a microscope. In poultry disease diagnosis, histopathological examination is used for: Marek's disease of chickens and avian leukosis to examine tumors; infectious laryngotracheitis of chickens, inclusion body hepatitis of chickens, fowl pox, etc. to examine inclusion bodies; avian encephalomyelitis, Marek's disease of chickens, etc. to examine brain and spinal cord lesions. The histopathology of certain infectious diseases in chickens has relatively characteristic changes
-
Pathogen, Symptoms, and Prevention and Control Methods of Louping Ill
This is a viral disease that causes inflammation of the brain, hence it is also called encephalitis. The disease occurs mainly in sheep and can occasionally cause illness in goats. It occurs only in mountainous areas with many ticks. 1. Pathogen The pathogen is a flavivirus. The vector is the tick. Ticks infected with the virus can transmit the disease by biting healthy sheep. It can occasionally be transmitted to humans and shepherd dogs. In humans, it manifests as high fever and acute muscle pain, but it does not cause death. 2. Symptoms Sheep: The incubation period is 1 to 3 weeks. After the virus
-
Induced biochemical responses in tea plant leaves after infection by the tea blister blight pathogen
The activities of enzymes such as phenylalanine ammonia-lyase, polyphenol oxidase and peroxidase, as well as the levels of proteins, proline and phenolic compounds in the leaves, were studied after tea plant leaves were infected by the tea blister blight pathogen. The study showed that in diseased leaves the activity of phenylalanine ammonia-lyase decreased, while the activities of peroxidase and polyphenol oxidase increased. Analysis of peroxidase isoenzymes by polyacrylamide gel electrophoresis using benzidine as substrate showed that healthy tea plant leaves had 4 isoenzymes, whereas
-
Detailed Explanation of the Pathogenic Characteristics of Duck Aflatoxin
(1) Production of aflatoxin Aflatoxin, like other mycotoxins, is one of the metabolic products produced by toxigenic fungi during their growth and reproduction in a substrate. This toxin was discovered in 1960 during the investigation of the cause of "Turkey X disease" that affected 100,000 turkeys in the United Kingdom. The following year, it was further found that peanut meal contaminated with Aspergillus flavus could induce liver cancer in rats, confirming that aflatoxin is a carcinogenic mycotoxin. The main fungi producing aflatoxin are specific strains of Aspergillus flavus and Aspergillus parasiticus, while Aspergillus wentii and
-
Detailed Explanation of the Pathogen and Epidemiological Characteristics of Swine Vesicular Disease
This disease is an acute infectious disease caused by the swine vesicular disease virus. Usually, only pigs can be naturally infected by this disease, while other animals such as cattle and sheep are not easily infected, so it can be distinguished from foot-and-mouth disease. The disease is characterized by vesicles on the skin of hairless parts of the pig's body and on the oral mucosa. Vesicles and erosions also occur on the skin of the coronary band, interdigital space, and heel, and around the teats of sows. This disease is widely distributed and spreads rapidly. It was first discovered in Italy in 1966. By the 1970s, after successively becoming epidemic in the United States, Austria, Hungary, and other Eastern and Western European countries, it also occurred in Japan
条件筛选