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Case Analysis of Diagnosis and Treatment of Swine Lungworm Disease
Swine lungworm disease is an endemic form of swine metastrongylosis caused by Metastrongylus. The disease mainly affects piglets weighing 30-50 kg. It causes pneumonia and bronchitis in pigs, severely affecting their growth and development and even leading to death. 1. Incidence situation: The vast majority of farmers in the Enshi region of Hubei raise pigs mainly through free-range methods, feeding them mostly feed, wild forage and farm vegetables, and most green feed is simply rinsed with water or not washed at all, so pigs are highly susceptible to parasitic infection. On May 20, 2008
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How should reishi mushroom bridge worms be prevented and controlled?
The reishi mushroom bridge worm (scientific name to be determined) belongs to the order Lepidoptera, family Geometridae. This pest damages reishi mushroom fruiting bodies. Young larvae feed on the surface and edges of the cap, causing pits and notches. After the 3rd instar, they can bore directly into the interior of the fruiting body and excrete large amounts of frass, which not only contaminates the mushroom bodies but also encourages the proliferation of weeds such as green mold, harming reishi mushroom growth and reducing yield and quality. (1) Morphological characteristics. Adult: body length 12 mm, wingspan 25-28 mm, body grayish black; antennae filiform, outer margin of forewing with 8 small black spots, a larger black spot in the middle of the costal margin,
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Damage Caused by Cutworms to Reishi Mushrooms and Its Control Methods
Cutworms belong to the order Lepidoptera, family Noctuidae. They are not only an important pest of agricultural and forestry crops, but also a common pest in the cultivation of edible fungi such as reishi mushroom, silver ear fungus, wood ear fungus, and oyster mushroom. They are widely distributed, but the degree of damage varies. They occur more frequently in outdoor open-field sunken-bed cultivation and plastic greenhouses. Damage characteristics: The larvae feed on the mycelium of reishi mushrooms, inhibiting mycelial growth and affecting fruiting body formation, which reduces reishi mushroom yield and lowers quality. Morphological characteristics: Adult body length 16-23 mm, wingspan 42-54 mm
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What to do when large silkworms are forced to mature prematurely by high temperatures? Do a good job of heat prevention and cooling
(1) In hot weather, prevent mulberry leaves from wilting and overheating. When feeding the silkworms, wait until the mulberry leaves have cooled before feeding. When feeding at noon, provide appropriate supplementary water to help cool things down and delay mulberry leaf wilting. This can be combined with supplementary feeding of miecanying or xiaoteling for disinfection. The standard for supplementary feeding of miecanying is 1 milliliter of miecanying agent added to 0.5 kg of water, fed with 4-5 kg of mulberry leaves, mixed evenly and then fed to the silkworms, with supplementary feeding once every 48 hours. The standard for preparing the xiaoteling agent water solution for disease prevention is to add 25 kg of water to each packet of the main agent. First use a small amount of water to
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Detailed Explanation of Rearing Standards and Key Technical Points for Young Silkworms
The key to rearing young silkworms is to master reasonable temperature and humidity, appropriately mature fresh mulberry leaves and reasonable techniques for handling molting and awakening. For leaves used for collecting newly hatched silkworms, the leaf color is yellow with a hint of green, slightly wrinkled; in spring pick the 2nd leaf, in summer and autumn pick the 2nd-3rd leaf. For the 1st instar, use moderately mature leaves that are green with a hint of yellow, with a flat leaf surface, the 3rd-4th leaf, preferably tender rather than old, depending on the climate. For the 2nd instar, moderately mature leaves have a normal green color; for the 3rd instar in spring, three-eye leaves can be used. For the 1st-2nd instars, cut leaves into square pieces 1.5 times the body length of the silkworm, and use strip leaves when expanding the rearing bed. During the spring silkworm season, one can aim for 10 days to the third molt.
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Detailed Explanation of Silkworm Disease Prevention and Control Methods and Technical Points
Silkworm diseases originally occurred mainly as midgut-type nuclear polyhedrosis and empty-headed flacherie, but at present, due to differences in rearing time and climatic conditions, silkworm diseases such as blood-type nuclear polyhedrosis and muscardine are predominant. 1. Blood-type nuclear polyhedrosis (commonly known as climbing silkworm, granny silkworm). The virus of blood-type nuclear polyhedrosis parasitizes in the blood of diseased silkworms. The blood of healthy silkworms is colorless and transparent, while the blood of diseased silkworms is milky white, so diseased silkworms are also called granny silkworms. Once a silkworm develops the disease, as the condition worsens, the diseased silkworm drags milky white purulent fluid and crawls frantically, so
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What are the benefits of cooperative rearing of young silkworms? Silkworm farmers who know early benefit early
From hatching to cocoon spinning, silkworms generally go through 4 molts and 5 instars. Instars 1 to 3 are called young silkworms, and instars 4 to 5 are called large silkworms or mature silkworms. The young silkworm stage is the period for building up physical constitution and is the foundation of the entire silkworm rearing period. If young silkworms are raised well, the silkworms have a strong constitution, and in the large silkworm stage they can better resist adverse environments and pathogens. This is beneficial for a bumper cocoon harvest. Therefore, raising young silkworms well is the key to achieving a bumper cocoon harvest. (1) It facilitates scientific silkworm rearing: the young silkworm stage requires higher temperature and humidity, and a dedicated person must regulate and control temperature and humidity day and night.
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How to control the occurrence of silkworm diseases in silkworm rearing
Through practical investigation, we found that in the process of rearing silkworms, the insufficient awareness of silkworm farmers about the harm of silkworm diseases often leads to the occurrence of silkworm diseases, causing serious losses to production. Therefore, how to control the occurrence of silkworm diseases has always been the primary task in sericulture production. 1. Causes of silkworm diseases. Silkworm rearing is a high-density group rearing method, with a large number of individuals reared in a certain area. The silkworms' mulberry eating and excrement are also in the same area. Once disinfection work is neglected, or rearing management is improper, infectious silkworm diseases are prone to occur, causing spread and
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Rearing Methods and Technical Key Points for Male Silkworm Larvae
I. New Hybrid Male Silkworm Varieties (I) Variety Traits. The new autumn-rearing male silkworm variety bred by the Sericulture Research Institute of the Zhejiang Academy of Agricultural Sciences - Qiuhua x Ping 30, has the advantages of a strong constitution, uniform molting and rising at each instar, and being easy to rear. The number of ants per gram is around 2310, the 5th instar takes 6 days and 18 hours, the whole larval stage takes 22 and a half days, the two-day hatching rate is 49.34%, the silk length is around 1240 m, the cocoon shape is oval, large and uniform, the cocoon color is pure white, and the cocoon shell rate and silk yield are high. (II) Key Points of Rearing Technology. For ant reception and light exposure, this can appropriately be done earlier than for common varieties.
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Why don't silkworms spin cocoons? An analysis of common causes
1. Pathological factors. For example, flacherie and soft rot are prone to infecting and causing disease before mounting, destroying the silkworm's silk gland secretion function, or the pathogen produces large amounts of toxic metabolites in the silkworm's body, paralyzing the silkworm's nerves so that it cannot spin silk and form a cocoon; 2. Physiological factors. First, abnormalities of the middle silk gland, mainly caused by rearing temperatures that are too high or too low, leaves that are too tender, or imbalance of the secretory glands, which causes silk gland abnormalities and prevents spinning; second, abnormalities of the anterior silk gland, mainly caused by exposure during rearing to excessive coal gas, fishy odors, alcohol and other harmful gases
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