• Journal of Sericultural and Entomological Science
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• v.17 no.2
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• pp.151-153
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• 1975

In the field of silkworm rearing industry many efforts have been made to find the chemical and physical ways which are able to save the labor in mounting procedures. In connection with these trend of the field, recently the authors developed a new mounting promoter, Boo-Choo-Ghin. Through a series of experiments we confirmed that Boo-Choo-Ghin is more effective, more convenient to use, safer and cheaper than Repper, one of the leading preparations of Japan. (The chemical composition and manufacturing method of Boo-Choo-Ghin will be published in the near future.)

• Journal of Sericultural and Entomological Science
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• v.10
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• pp.73-75
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• 1969

There are two fold aims in this experimental study. The aim is to investigate the bacteria which produce the high activity enzyme or the cocoon for utilization to the textile and the industry. The ether is to protect against the bacteria that damage silk protein during storage. The results are summarized as followes: 1. Among the isolated bacteria from the cocoon, No 4 strain had the high activity of the $\alpha$-amylase. But this strain had not been identified. The results of experiment is shown in the table II. 2. Among the isolated bacteria from the cocoon, No II strain had the high activity of the protease on substance of the casein. The results of the experiment is shown in the table II. 3. The bacteria which had the high activity of the degumming effect of the sericin, the part of the operation for 7 days was higher part of the operation for 3 days. The results of the experiment are indicated in Fig I and Fig II.

• Journal of Sericultural and Entomological Science
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• v.40 no.2
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• pp.97-104
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• 1998

Mainly due to limited genetic resources available and also urgent need for hybrids suitable to local conditions, conventional theories and regular methods for bivoltine silkworm breeding are not easily applicable in such a tropical country as Sri Lanka which is recently planning to scale-up the silk industry. A simplified but practical methodology was introduced to overcome such constraints. Through application of such modified informal breeding methods, two hybrids named DP0308 and DP0314 were selected for cocoon production. Details of the altered method of germplasm improvement in the silkworm are presented, along with combining ability and heritability estimates for six parental pure lines in a half-diallel cross.

• International Journal of Industrial Entomology and Biomaterials
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• v.29 no.1
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• pp.93-119
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• 2014

Tropical tasar silkworm, Antheraea mylitta (Lepidoptera: Saturniidae) is a polyphagous silk producing forest silkworm of commercial importance in India. Forest dependent people rear its larvae on different forestry host plants twice or thrice in a year for small household income. Larvae of A. mylitta feeds on many forest tree species, but always show a great degree of selectivity as a function of its behavioural responses to physical structure and chemical features of the host plants. Cocoon crop of A. mylitta is influenced by heterogeneity of tasar food plants and climatic conditions of the habitat. The role of host plants, temperature, humidity, rainfall, photoperiod and climatic variables on the growth and development of insects have clearly been demonstrated. This article entails an in-depth analysis on ecological and nutritional aspects of A. mylitta, which may provide selective information to researcher and forest managers, who are particularly associated with livelihood improvement of the poor people in forested area through location specific forest insect industry.

• Journal of Sericultural and Entomological Science
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• v.55 no.2
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• pp.44-53
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• 2019

Sericin has been removed in textile industry to improve the luster and hand of silk textile. Therefore, the sericin was considered as useless material. However, recently sericin has attracted researcher's attention since unique properties of sericin including high water retention, UV protection, and wound healing effect were reported. In spite of the useful properties of sericin as biomedical and cosmetic materials, its poor mechanical properties have restricted its industrial use in biomedical and cosmetic fields. To improve the mechanical properties, various sericins were prepared by different conditions, and the effects of the preparation condition on the structure and properties of sericin were examined. In this review paper, research trend in the structure and properties of sericin prepared with different conditions were intensively introduced.

• Journal of Sericultural and Entomological Science
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• v.22 no.2
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• pp.8-12
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• 1981

Practical application of silkworm artificial diet is very desirable to save labour in sericultural industry as the problem of labour shortage is becoming serious in Korea. However, silkworms reared on the artificial diet are more susceptible to viruses than those reared on mulberry leaves because of the lower anti-viral activity of gut juice of silkworms grown on artificial diet compared with that of silkworms grown on mulberry leaves. In this study, authors investigated the varietal difference of silkworm larvae, Bombyx mori L., reared on artificial diet which contained 20 percent of dried mulberry powder, in the susceptibility to nuclear polyhedrosis virus (NPV). The results showed that there is no difference in susceptibility to NPV among tested varieties when high concentration of NPV was admitted to silkworm larvae, but varietal difference appeared in lower concentration admitted. Among 7 hybrids tested, Hansaeng 1${\times}$Hansaeng 2 was most resistant to NPV with an $LC_{50}$ of 2.7${\times}$10$\^$6/ and Jam 111${\times}$Jam 112 was also more resistant comparatively than other hybrids.

• International Journal of Industrial Entomology and Biomaterials
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• v.5 no.2
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• pp.141-151
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• 2002

The success of sericulture industry in India is mainly attributed to the well-planned annual sericultural activity and the systematic implementation of pest preventive and control measures. The insect spectrum of silkworm and its food plants is complex and plays a major role in limiting the production of silk. Insects cause extensive damage to plant whereas predators and parasites either kill the silkworm larvae or force them to spin flimsy cocoons. Unilateral control measure against this pest is mainly based on the use of synthetic organic insecticides. Though these approaches initially paid rich dividends, the undesirable consequences soon surfaced. Insecticide induced resurgence of gall midges, leafhopper, leaf roller, secondary pest out breaks and development of pest biotypes has led to realization of Integrated Pest Management in sericulture. Various components of IPM, viz. Host plant resistance, cultural practices, biological control, chemical control and integrating them at various technological levels have been studied. Sources of host plant resistance have been identified for some of the major insect pests. High yielding mulberry variety has been propagated and their resistances towards major pests have been recorded. Cultural practices like pruning, pollarding, judicious use of nitrogen, optimum spacing and weed management have preyed to be the powerful tools in containing pests. Natural control over the pest population build- up exerted by the wide range of parasitoids, predators and pathogens has been well documented with identification of natural enemies and studies on their potential. Augmentation, through inoculation or inundative releases of parasitic arthropods, is the most direct way of increasing the numbers of these beneficials in sericulture.

• Journal of Sericultural and Entomological Science
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• v.44 no.1
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• pp.28-31
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• 2002

Paecilomyces tenuipes (Nunkkot Dongchunghacho) was erroneously treated in three different scientific names: Paecilomyces japonica, Isaria japonica and Paecilomyces tenuipes. Since the fungus has been widely used in various fields of research and industry, its nomenclatural uncertainty caused many problems. Therefore, morphological studies of Korean isolate were carried out and compared with published data on other isolates of P. tenuipes to establish its proper taxonomic position.

• Journal of Sericultural and Entomological Science
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• v.19 no.1
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• pp.19-23
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• 1977

In the previous short communication, the authors reported the applicability of Sodium Hyplochoride solution to silkworm rearing industry as a disinfectant after confirmed the fact that the chemical agent is capable to kill most of the pathogens of silkworm diseases. The authors, in the present study, attempted to investigate the influence of the chemical on the growth of silkworm larvae and the effect on the disinfection of silkworm larvae to inactivate the pathogen of yellow muscardine disease, Isaria farinosa and the results obtained are summarized as fellows. 1. The chemical agent did not affect the growth of silkworm larvae, when it was applied on silk-worm body with the concentration of 1,3,5 per cent of the agent during the rearing period. 2. The Sodium Hypochloride solution did not give any damage to silkworm larvae when larvae were fed up with 1,3,5 per cent of the solution. 3. In the bioassay of the solution on disinfection of larvae inoculated with yellow muscardine disease pathogen, the fact that the agent could control the disease was observed by showing much low infection rate in 3.5 per cent treatment compared to non-treatment control.

• Journal of Sericultural and Entomological Science
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• v.5
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• pp.63-66
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• 1965

This experimental work is aimed to find out if there is a reasonable tussah silk reeling service. The results obtained are as follows, 1) The best silk reeling rate of tussah cocoon was 8.02% by dupion reeling machine, 7.44% by common with Autumn cocoons, and 7.23% by dupion machine, 6.79% by common with Spring. Those results are sup-erior to 6.00% of the former. 2) The cocoon grading ratio was 63∼68% with Autumn cocoons md 66∼70% with Spring. Spring cocoons showved more 2∼3% than Autumn in cocoon grading ratio. These seem to be resulted from the weather condition. 3) The reeling efficiency was 70g per labor for an hour. 4) The strength of tussah silk war 3g/d and elongation 26% The strength of tussah silk is weaker, and the elongation of it larger than those of raw silk. 5) As these results, the enterprise of the tussah silk reeling has become possible, and will develop as a new industry. Therefore. it is demanded that this new industry will be helped by the Government to get foreign money.