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Causes and Prevention and Control Methods of Duck Hemorrhagic Disease
Duck hemorrhagic disease is an infectious disease caused by a novel herpesvirus (Duck herpesvirus type II) that can infect ducks of all breeds and all ages. Because the feather shafts of both wings, the tip of the upper beak, and the tips of the claws and webbed feet of affected ducks often bleed and appear purplish-black, it is commonly known as duck "black feather disease," duck "black shaft disease," and duck "purple beak and black foot disease"; based on the characteristic necropsy lesions of the disease, it is also called duck hemorrhagic disease. At present, the disease occurs in several southern provinces of China, including Fujian, Guangdong, and Zhejiang, and affected duck flocks are prone to concurrent or secondary bacterial infectious diseases (such as duck infectious serositis
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Control and Treatment Methods for Other Pig Diseases (1)
(1) Listeriosis in pigs. This disease is a zoonotic infectious disease caused by a Gram-positive Listeria bacterium that has no capsule and no spores. In pigs, it mainly presents with the characteristics of meningoencephalitis, septicemia and abortion. Symptoms: Most affected pigs (especially piglets) show septicemic symptoms, with body temperature rising to 42°C, depression, anorexia, rapid breathing, and cyanosis of the skin of the head, ears and abdomen. Gait is abnormal, with the hind legs splayed while sitting on the ground in a stargazing posture, or continuous circling, spasms, gradual paralysis of the hind legs, and after falling to the ground, paddling of the limbs, with death within 2-4 days; pregnant sows abort.
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What are the prevention and control methods for swine epidemic encephalitis B
Swine epidemic encephalitis B is a zoonotic infectious disease caused by the Japanese encephalitis B virus. Mosquitoes are the long-term host and main transmitter of the virus, so the disease has an obvious seasonal pattern, occurring more frequently in summer and autumn when mosquitoes are active. The disease can infect pigs of different ages, sexes and breeds, at around 6 months after birth. It generally occurs sporadically, with many inapparent infections, but regardless of whether symptoms are present, infected pigs are contagious in the early stage of infection. After infection, pigs mostly develop sudden
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What are the prevention and control methods for soft-shelled turtle red plastron disease?
Cause: Caused by Aeromonas punctata infection. Symptoms: Sick turtles respond slowly to external stimuli. The most obvious sign of the disease is that the entire plastron becomes red and swollen or appears in a red patch pattern, accompanied by ulceration and edema. Some turtles bleed from the mouth and nose. Necropsy shows severe liver lesions; some are black; some are mottled. The intestines show localized or entire-segment congestion and inflammation; some have fluid accumulation in the abdominal cavity. Prevention and control: 1) Control stocking density; 2) Improve the pond bottom substrate, and thoroughly clear the pond at the end of production;
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The Harm of Rotifers to Adult Fish and Control Methods
In recent years, while providing technical services, the author has found that rotifers are overrunning adult fish ponds in some areas, causing many problems for farmers. This phenomenon is especially serious in some long-established aquaculture areas or places using sewage for aquaculture, and it deserves sufficient attention. The harm of rotifers to adult fish The harm of rotifers to adult fish is mainly as follows: rotifers have an extremely strong reproductive rate and will form a dominant population in a short time, eating most of the algae, reducing photosynthesis and weakening oxygen production capacity. At the same time, they also consume a large amount of oxygen, and the result is very likely to cause fish oxygen
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What are the control methods for the white-spotted flower chafer?
The white-spotted flower chafer sporadically mainly damages corn, grapes, tomatoes and apples. I. Morphological characteristics and living habits of the white-spotted flower chafer. The adult is 17-24 mm long and 9-12 mm wide, oval-shaped, with a bronze luster, and its body surface is scattered with numerous irregular white downy spots. Only 1 generation occurs each year. It overwinters as larvae in soil or in compost made from rotted straw. It starts activity in March of the following year. In late April and early to mid-May it damages corn seeds and seedlings, adults appear in May, and June-August is the peak occurrence period. Adult white
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Occurrence Patterns and Control Methods of the White-Spotted Flower Chafer
The white-spotted flower chafer belongs to the order Coleoptera, family Cetoniidae, and is also known as the white-striped copper flower chafer, white-spotted flower chafer, white-spotted golden chafer, and copper chafer. It is distributed in Northeast China, North China, and the Huang-Huai-Hai region. When the white-spotted flower chafer damages crops, the market quality is greatly reduced in mild cases, and completely lost in severe cases, bringing relatively serious economic losses to growers. Hosts Currently, the hosts of the white-spotted flower chafer include corn, sunflower, tomato, watermelon, peach, grape, plum, strawberry, hop, the large composite weed bull thistle, willow, and elm. Damage characteristics The
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Simple Diagnosis and Control Methods for Rice Deadheart
I. Simple Diagnosis of Rice "Deadheart" 1. "Deadheart" caused by insect pests. Sesamia inferens, Chilo suppressalis, Scirpophaga incertulas, mole crickets and other pests damaging rice can all cause "deadheart," and the main differences are: (1) Sesamia inferens: the insect holes are large and there is much frass, and the frass is generally deposited between the rice leaf sheath and the stem. The leaf sheaths and leaves of the damaged rice all turn yellow. The damage is more severe at the edges of the rice field and lighter in the middle of the field. (2) Chilo suppressalis: after the eggs hatch, the young borers first gather inside the rice leaf sheath to feed and cause damage; on the outside of the damaged leaf sheath, water-soaked yellow spots first appear, then it gradually turns yellow
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What are the control methods for early heading in rice?
This year, the Yangtze River and Huai River basins have experienced persistent drought with little rain, causing severe impacts on agricultural production. In July-August, rice in the rice-growing areas north of the Yangtze River and in the Huai River basin showed "early heading" to varying degrees. Field performance: 2-3 early heads per hill, differing from late-developed tillers by more than 7-10 days, clearly showing "second flush heads" or "third flush heads". To make up for the losses caused by "early heading" to field production as early as possible, the causes of early heading are analyzed below, and rescue methods are proposed. The length of the rice seedling age is closely related to the early heading phenomenon.
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Harm and Control Methods of Dodder in Potatoes
[Host crops] Potato, tomato, eggplant, pepper, Chinese onion, soybean and many other crops. [Disease diagnosis] It occurs sporadically or in patches in the field. Dodder twines its vine stems around the stems of the plants, coiling around them, and at the point of contact with the potato plant it grows haustoria that penetrate into the stem or petiole tissues, absorbing the plant's water and nutrients, causing the affected plants to grow weakly. The plants are stunted, with bent and slender stems, small and yellowing leaves, and few and small tubers. In severe cases, the stems and leaves of the plant are completely covered with dodder, and the whole plant stagnates and stops growing until it dies. The pathogenic dodder is Chinese dodder (Cuscuta chinensis). The dodder stem is slender
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