-
The Harm and Control Methods of Angelica Leaf Spot Disease
The pathogen of Angelica leaf spot disease (Septoria SP.) is a fungus of the genus Septoria in the subphylum Deuteromycotina. The pycnidia are round, and the conidia are filiform to needle-shaped, colorless and transparent, straight or slightly curved, mostly with slightly pointed tips, with 1-3 septa. 1. Harmful symptoms: it damages the leaves. In the early stage of the disease, brown spots appear on the leaf surface, and the lesions gradually expand, with a chlorotic halo appearing around them, the edges appearing reddish-brown, and the center grayish-white. In the later stage, small black particles appear within the lesions. When the disease is severe, most of the leaf becomes reddish-brown, and finally gradually withers
-
Angelica sinensis with shade net coverage: high yield increase and quality improvement benefits
The shade cultivation technique for Angelica sinensis starts from the three-leaf stage of its growth (that is, from mid-May to early August after summer begins, when temperatures are high and light is intense). A shade net with a 50% shading rate is timely placed over Angelica sinensis, providing a suitable micro-environment of moderate temperature, weak light, and moisture that mimics its original ecological growing conditions. By lowering temperature, increasing humidity, and reducing light, it reduces the early bolting rate of Angelica sinensis in dry flatland cultivation to about 30%; moreover, shade cultivation of Angelica sinensis also helps prevent and reduce pest and disease damage, thus improving the quality of Angelica sinensis.
-
Key Points for Pest and Disease Control in Understory Cultivation of Asarum
1. Diseases. Asarum sclerotinia rot is a devastating disease of cultivated Asarum, affecting the roots, overwintering buds, stems, leaves, flowers, fruits and other parts of the plant. It occurs mostly in spring and autumn, and in severe cases can cause the complete death of Asarum. Control measures: follow the principle of "prevention is more important than cure" and make proper arrangements. (1) Block off affected areas. Prohibit the transport of diseased seeds and diseased seedlings to the outside to prevent human-mediated spread. Affected areas and seedbeds should be thoroughly treated in a timely manner. (2) Establish disease-free seedling bases. Select disease-free seedlings for transplanting, establish strict management systems, and prevent diseased soil,
-
Diagnosis and Treatment Report of Chicken Feather Lice Disease
Feather lice are a common external parasitic disease in chickens. At a chicken farm in Taobei District, an outbreak of feather lice disease caused a significant drop in egg production and a decline in farming economic returns. The diagnosis and treatment results are reported as follows: 1 Occurrence of the disease. The chicken farm had five years of chicken-raising experience, bringing in chicks every spring of the previous year, going through one laying period, and culling them in the autumn of the following year, using an all-in-all-out system. In early December 2003, the egg production of 20,000 young laying hens kept in the farm's four chicken houses dropped significantly, along with feather loss. They had adjusted
-
Symptoms and Control Methods of Swine Kidney Worm Disease
1. Pathogen This disease is caused by the parasite Stephanurus dentatus, which lives in the kidneys of pigs or in the fat around the kidneys and the walls of the ureters. The swine kidney worm is a thick, hard nematode shaped like a matchstick, dark red in color, with a well-developed buccal capsule. The male is 20-30 mm long, and the female is 30-45 mm long. The eggs are passed out of the body with the urine, and under suitable environmental conditions they develop into infective larvae in 3-5 days. These invade the pig through the mouth or skin, migrate with the bloodstream to the liver, and then further migrate to the kidneys and surrounding tissues, gradually developing to maturity. From the time the larvae invade the pig's body until they develop to
-
How to use drugs to prevent swine respiratory diseases? Sharing practical solutions
A variety of drugs can be used in production to prevent swine respiratory diseases. The main drugs include tiamulin (Tailijia), chlortetracycline (doxycycline), oxytetracycline, amoxicillin, tiamulin, kitasamycin, thiamphenicol, florphenicol, Ailihutaisu, Taihuangfeisu, etc. New drugs and drug combinations are also constantly emerging. Pig farms (households) can flexibly choose according to actual conditions, and combining with drug sensitivity tests will be more targeted. For sows, add 100 grams of tiamulin, 300 grams of chlortetracycline, and amoxicillin per ton of feed
-
What are the treatments for six common diseases of chickens?
Raising chickens is a good way for farming families to get rich. But in the process of raising chickens, the common diseases mainly include chicken roundworm disease, chicken tapeworm disease, chicken mites, chicken feather lice and chicken diphtheria, all of which cause varying degrees of harm to chicken growth. Once disease occurs, it must be treated promptly to reduce the losses these diseases cause to farmers raising chickens. The chicken roundworm is a round, pale-yellow nematode that parasitizes the small intestine of chickens, and the worm body is generally 50 mm to 110 mm long. After a chicken gets this disease, egg production drops, and in severe cases there is anemia and even
-
Fish fungal disease is caused by water molds
Signs of infection The obvious sign of infection is cotton-wool-like growths, usually white, but sometimes grayish black to green. The fungus usually starts on the body and trunk, but it may also originate at a site with some injury, and it can spread to attack the fins, mouth, eyes and gills. Affected fish All fish may be harmed. Details of infection Fungi are plants that grow on dead organic matter. The typical fungal body, or mycelium, is made up of very fine filaments or external hyphae, and the external hyphae pierce dead or decaying
-
Detailed Explanation of the Main Symptoms and Onset Patterns of Eel Hyperactivity Disease
Caused by Eel Coronavirus-like Virus. Main symptoms: 1) Diseased eels dart erratically up and down in the water at the pond edge, or roll and spin, or swim backwards, with occasional paroxysmal spasmodic trembling or twisting of the head, mouth open, followed by death shortly after. There are no obvious external lesions, though slight congestion or ulceration may sometimes be seen in the oral cavity, anal fin, and pectoral fin areas; necropsy may reveal swelling of the liver or kidney. 2) In the early stage of onset, a small number of eels swim irregularly at the pond edge, swimming weakly, with intermittent head twitching, spinning and rolling, or backward movement. After a few days, a large number of eels show similar symptoms, with paroxysmal trembling of the head, and after frantic swimming at the water surface they die quickly; newly dead eels are rigid with the mouth open. The body surface of diseased fish is intact, but the lower jaw shows varying degrees of ulceration or congestion. Some diseased fish have congestion or ulceration in the oral cavity, anal fin, and tail. Most diseased fish have bright red gill filaments and pale red liver, and some have swollen kidneys. In diseased eels, red blood cells, hemoglobin, and serum chloride ions are significantly elevated, while blood urea nitrogen content is significantly decreased, and serum cholinesterase is reduced. At present, because understanding of this disease is still lacking, diagnosis can only be based on the above main symptoms. It mainly occurs in European eels and African eels, with the high-temperature summer period as the peak epidemic season, hence it is also called European eel summer hyperactivity disease. From the start of onset to the peak period is about 7 days, and mass mortality occurs about 15 days after onset; the speed of spread and transmission is very fast, and it readily forms outbreaks and epidemics.
-
How do you prevent disease when farming eels? There is real know-how involved
Every year in July, August and September, the weather is hot, and farmed eels are prone to serious diseases. The main signs are: 1. Gill rot disease caused by parasites or bacteria. 2. Liver-kidney syndrome caused by feed or management factors. These two diseases have a high mortality rate and are difficult to treat, and they are the biggest headache for many farmers. Based on follow-up surveys in recent years, I would like to offer some humble observations on this issue. 1. Focus on prevention to avoid disease outbreaks. The specific steps are as follows: 1. Regularly use insecticides,
条件筛选