• Title/Summary/Keyword: Silk moth

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Improvement of Predictive and Corrective Inspection Methods to Control Nosema bombycis Infection in the Silkworm, Bombyx mori

  • Nguyen, Mau-Tuan;Jon
    • Journal of Sericultural and Entomological Science
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    • v.39 no.2
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    • pp.146-153
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    • 1997

  • The microsporidian infection with Nosema bombycis, reconfirmed its high virulence and transovarial tranmissibility, however, the characteristic symptom of the spots like pepper grains on the diseased larval skin was no more recognized by present varieties of the silkworm. Transovarial transmission rate detected from moth was above 90% in dead eggs or dead larvae in the rearing by mulberry leaves, 80% in the newly hatched larvae starved to death. Transovarially transmitted N. bombycis was easily observed from dead eggs and larvae, and were suggested an individual inspection of a few of dead eggs for detection of the pathogenic spores. The progeny population provided indicative factors on the sampling of predictive and corrective inspection. The higher concentration of N. bombycis spores included in the hindabdormal part of infected moth, applicative on the simple method of indivisual moth inspection. For the predictive inspection of growned 5th-instar larvae, N. bombycis infection was detectable without microscopic observation by the unique symptom of turbid milky-white spots on the silk gland. Inspection of the meconia artificially discharged from silkworm moth, was also succesful of microscopic observation before crossing, without killing or homogenize the moths. The results provided a basis of rational methods for the inspection of N. bombycis infection of the silkworm.

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Localization of Manduca sexta Allatotropin Neuropeptides in Developing Ventral Nerve Cord of the Silk Moth Bombyx mori

  • Park, Cheolin;Lee, Bong-Hee
    • International Journal of Industrial Entomology and Biomaterials
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    • v.3 no.2
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    • pp.177-185
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    • 2001

  • This study has been carried out to determine localization of Manduca sexta allatotropin (Mas-AT) neuropeptide in developing ventral nerve cord of the silk moth Bombyx mori with polyclonal antisera against Mas-AT. Suboesophageal ganglion (SOG) of the second to fifth instar larvae and 3-day-old pupae showed two to ten Mas-AT-immunoreactive (Mas-AT-IR) cell bodies. There were two to three pairs of labeled cell bodies in each thoracic ganglion (TG) from third instar larvae to adults, with the exception of TG from prepupae. One pair of labeled cell bodies was localized in each abdominal ganglion (AG) 1 to 6 from third instar larvae to 3-day-old pupae, whereas in 5-day-old pupae to adults there was one pair in a similar location of AG 1 to 5. The seventh neuromeres of terminal abdominal ganglia (TAG) from third instar Iarvae to 3- day-old pupae contained four labeled large cell bodies. In each of AG 1 to 7, these cell bodies showed similar allatotropin-immunoreactivity in appearance. Some labeled axons, projected from Mas-AT-lR cells in each of those AG, were extended to the nerves N 1 and N 2.

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Occurrence of Unfertilized Eggs in the Mulberry Silkworm, Bombyx mori (L.) (Lepidoptera: Bombycidae)

  • Saheb, N.M. Biram;Singh, Tribhuwan;Saratchandra, Beera
    • International Journal of Industrial Entomology and Biomaterials
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    • v.18 no.1
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    • pp.1-7
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    • 2009

  • Quality of seed in the mulberry silkworm, Bombyx mori (L.) is determined by many important factors, wherein unfertilized eggs play an important role. Unfertilization of eggs are caused by several reasons such as, abnormality in the sexual organs of the male and female, abnormal development of the micropylar end of the egg, unfavorable environmental conditions during spinning, cocoon preservation, imperfect handling of moths, mating, ovipostion, cold storing of pupae / moths and indiscriminate use of male moths etc. Though the presence of unfertilized eggs would in no way affect the fertilized ones and their quality directly, the frequency of their occurrence underrates the quality and brings down the hatching percentage. Lower the occurrence of unfertilized eggs, higher is the rating of seed quality. Of the various intrinsic and extrinsic factors and events involved in egg deposition of an adult silk moth, mating is an instinct and a biological obligation for the ultimate perpetuation of the species and a must to provide stimulus for oogenesis and bring about biochemical changes in the spermatophore of the silkworm in order to ensure the presence of sufficient number of normal sperms and testicular fluid in the female reproductive organ, activating ovulation and accelerating oviposition behavior and egg deposition. An attempt has been made in this article to briefly elucidate the characteristics of unfertilized eggs, causes of their occurrence and its impact as well as the significance in silkworm seed production.

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Rediscovery of Tinea translucens Meyrick (Lepidoptera: Tineidae) infesting the Stuffed Mammal in Korea (박제표본을 가해하는 옷좀나방에 대한 보고)

  • Kim, Seok;Bae, Yang-Seop
    • Korean journal of applied entomology
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    • v.46 no.1 s.145
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    • pp.5-11
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    • 2007

  • The clothes moth, Tinea translucens Meyrick is reported for the first time from Korea, based on the specimens roaring the larvae. The larvae make silk-made case from the first instar and pupate in the case at mature stage. Photographs of adult genitalia, informations of occurrence and distribution in Korea are provided. Also a brief biological informations for the species are given.

  • https://doi.org/10.5656/KSAE.2007.46.1.005 인용 PDF KSCI