The aspergillosis in silkworm can occur in the silkworm stage, in the cluster and in the pupa stage, and the incidence and weight loss of the silkworm stage are small. Diseased silkworms show loss of appetite, uneven development, irregular black spots on the anus or other parts of the anus, followed by the occurrence of rectal prolapse, fecal knots; disease spots gradually expand into burn-like plaques; the body of dead silkworm does not soften after death. In a humid environment, the body is covered with Aspergillus, yellow-green, brown or dark brown.
The pathogen of Aspergillosis is yellow Aspergillus in fungi, which is common in sericulture environments. The diseased environment is a hot and humid Jamsil microclimate. The pathogens are highly saprophytic and can survive well in mulberry fields, dead silkworms, bamboo and silkworms, silkworm pad materials, and livestock and poultry feed. Each year in summer and autumn, silkworms often outbreak this disease in the environment of high temperature and humidity, causing losses to the sericulture. Aspergillus infection is transmitted through silkworms and mulberry leaves.
Prevention and technical measures:
1. Kill pathogens of Aspergillus in silkworm silkworms by cleaning, cleaning, and disinfection. After washing and disinfecting, the silkworm must be dried before entering the room. Silkworm silkworms and litters are often used in silkworms to keep them dry and prevent mold.
2. Use of fungicides for disinfection of silkworm silkworms. The main pharmaceuticals are: 1 commercially available silkworm medicine: small silkworm disease prevention No. 1 powder, silkworm disease prevention No. 1 powder, according to the package instructions. 2 Use bleaching powder and lime powder to disinfect silkworm silkworms. The preparation method is as follows: using 0.5 kg of bleaching powder containing 25% of available chlorine, 5.8 kg of small silkworm with lime powder, and 3.7 kg of large silkworm with lime powder, mixing evenly, and sealing them with plastic bags. In addition to sleep, from the silkworm period is not used, generally every 2 to 3 days with a real powder evenly sprinkled once, overcast and rainy days to sprinkle powder once a day. Scattering powder method, take the fine-grained rice flour sieve, pad a piece of gauze in the sieve, and then spread the powder evenly on the silkworm body. 3 Use 500 to 700 times liquid antibacterial agent 402 to spray silkworm body or dip silkworm net, mat cover, silkworm seat.
3, reasonable control of silkworm room temperature humidity. Silkworm twigs, garlic leaves, and wet straw smoky smoke are used during the silkworm eradication; frequent opening of doors and windows for ventilation; silkworms use tarpaulins, fresh lime powder, hay festivals, and other moisture absorbent materials; ground silkworm sand (dung) reduces evaporation.
4. Do a good job in mulberry garden pest management to reduce the sources of external infections. Silkworm leaves do not use insects, contaminated leaves.
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