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Key Technical Points for Disinfection and Disease Prevention During the Young Silkworm Stage
In young silkworm co-rearing, "disinfection and disease prevention" must be carried out throughout the whole process, earnestly grasping the technical keys of three links: pre-rearing disinfection, disinfection during the rearing period, and final disinfection: 1. Pre-rearing disinfection. Based on the principle of being comprehensive and thorough and seeking practical results, on the basis of comprehensive cleaning and washing, targeted chemicals are used for disinfection, while strengthening management after disinfection. It should be noted that: 1. The water used for washing must be of good quality; it is strictly forbidden to wash silkworm tools in stagnant ditches, ponds, or by riversides; 2. Garbage and other waste from cleaning and sweeping must be concentrated
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Detailed Explanation of Key Points for New Efficient Rearing Techniques for Late-Stage Silkworms
During the late-stage rearing period, especially the fifth instar, mulberry consumption accounts for about 85% of the entire rearing period, and a large amount of labor, such as removing excrement, feeding mulberry leaves, and picking ripe silkworms, is concentrated in the fifth instar. According to surveys, traditional silkworm tray rearing. Not only requires a large amount of labor, but also makes silkworm rearers extremely exhausted, with low labor efficiency. Using fixed rearing stands for late-stage silkworms with automatic mounting, without removing excrement, without picking ripe silkworms, and without moving trays up and down, mulberry feeding and mounting are convenient. Compared with traditional silkworm tray rearing, it can save more than 50% of labor and reduce labor intensity by 40%-50%. 1.
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How to comprehensively prevent and control infectious silkworm diseases? Detailed explanation of key technical points
During sericulture, the occurrence of infectious silkworm diseases often leads to poor cocoon harvests and reduced cocoon quality. Therefore, disinfection and disease prevention must run through the entire sericulture process. On the basis of focusing on disinfection before sericulture, doing a good job of disease prevention during the rearing period and disinfection after sericulture is completed, and carrying out comprehensive prevention and control, can pathogens be thoroughly eliminated and the occurrence of infectious silkworm diseases be prevented. 1. Promptly cull diseased silkworms. Many infectious silkworm diseases, such as midgut-type nuclear polyhedrosis, viral flacherie, pebrine, and bacterial gastroenteritis, etc. In the early stage of infection with the above diseases, silkworms often show
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Detailed Explanation of Key Technical Points for Cooperative Rearing of Young Silkworms
As the saying goes: "Rearing young silkworms well means 70% of the harvest." For this reason, special attention should be paid to the cooperative rearing of young silkworms. (1) Specific requirements and technical measures for cooperative rearing of young silkworms 1. The cooperative rearing room should use a dedicated young silkworm room. It needs good heat preservation and moisture retention performance, and easy ventilation. Strict disinfection should be carried out before rearing silkworms, implementing "three disinfections and one fumigation." "Three disinfections": the first round uses lime slurry; the second round uses bleaching powder; the third round uses disinfection cleaner; "one fumigation": use toxic powder fumigation smoke. 2. Heating is uniformly provided by heated bed warming. Because heated bed warming makes
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What to Do If Silkworms Don't Spin Cocoons? Causes and Solutions
In silkworm rearing, the phenomenon of silkworms not spinning cocoons occurs from time to time, causing certain losses to sericulture production. First, the causes of silkworms not spinning cocoons must be identified, and then measures taken for prevention and control. The main causes are: 1. Pathological factors. For example, flacherie and soft rot infect and develop before mounting, destroying the secretory function of the silkworm's silk glands; or pathogens produce large amounts of toxic metabolites in the silkworm body, paralyzing the nerves so that the silkworm cannot spin silk and form a cocoon. 2. Physiological factors. Abnormal middle silk glands, mainly due to excessively high rearing temperature,
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What are the control measures for trimolter silkworms?
At present, most silkworms reared in our province are tetramolters. Under normal incubation and rearing conditions, a tetramolter should molt four times in one generation. However, if incubation and rearing conditions are poor, a tetramolter may molt only three times in one generation, resulting in reduced mulberry consumption, smaller cocoon shape, and lower yield. The reasons why tetramolters molt only three times include: incubation under low temperature of around 20°C, dry and dark conditions; receiving more than 12 hours of light per day during the young silkworm stage; feeding mulberry leaves that are too tender or too high in protein; after the silkworm eggs are brought back, they are not kept warm and protected, and are
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Detailed Explanation of the Symptoms and Prevention and Treatment Methods of Canine Heartworm Disease
This disease is a filarial disease caused by canine heartworm parasitizing the right ventricle and pulmonary artery of dogs (rarely in the thoracic cavity and bronchi), resulting in symptoms such as circulatory disturbance, difficulty breathing, and anemia. In addition to infecting dogs, cats and other wild carnivores can also be infected. This disease is widely distributed in China, and has been found from Shenyang in the north to Guangzhou in the south. [Pathogen and its life cycle] Canine heartworm (also known as dog heartworm) is yellow-white, slender, and thread-like. The male worm is 120-160 mm long, with a spirally curled tail; the female worm is 25
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A brief introduction to new mulberry and silkworm varieties, explained in one article
1. Nongsang No. 12: A new mulberry variety bred by the Sericulture Research Institute of the Zhejiang Academy of Agricultural Sciences in 1984 through artificial sexual hybridization. Main traits: compact crown, many shoots, long and straight branches, thick leaf flesh, dark green leaf color, sprouting earlier than Heye Bai, fast growth, strong adaptability. Regional trial results: leaf yield per mu 1867 kg, 18.73% higher than the control Heye Bai, significantly higher than the control; cocoon shell weight per 10,000 silkworms 7 kg, 8.03% higher than the control Heye Bai, extremely significantly higher than the control; resistance to yellowing-type
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Causes and Control Methods of Silkworm White Muscardine
Silkworm white muscardine is caused by Beauveria bassiana entering the silkworm body through the skin. The route of infection is contact transmission. After the silkworm dies, the body is first soft and then hard, covered entirely with white conidia, and is called a "white muscardine silkworm." Beauveria bassiana prefers moisture and fears dryness; in humid places and rainy seasons, silkworms are very prone to the disease. If disinfection and disease prevention work is neglected during the silkworm rearing period, it will cause a major outbreak of white muscardine. Causes of silkworm white muscardine ① The rearing rooms and rearing tools for cooperative rearing of young silkworms were not thoroughly disinfected according to the prescribed standards, and the residual amount of Beauveria bassiana was high.
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Control Methods and Technical Key Points for Silkworm Pesticide Poisoning
After silkworms suffer pesticide poisoning, they generally show symptoms such as restless crawling, swelling of the thoracic region, rearing up, vomiting fluid, trembling, and shortening of the body. After poisoning by organophosphorus pesticides (trichlorfon, dichlorvos, etc.), the silkworm's abdominal legs twitch, the front half of the body swells and elongates, and the rear half shrinks, especially with the tail becoming shortened and smaller and tilting upward toward the back. After poisoning by organonitrogen pesticides (chlordimeform, bisultap, etc.), the main symptoms are spinning silk, crawling toward the edge of the rearing bed, and obvious refusal to eat; after crawling for some time, the thoracic region becomes transparent and the silkworm slowly dies. After death, it does not
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