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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Sericultural and Entomological Science
Journal Basic Information
Journal DOI :
Korean Society of Sericultural Science
Editor in Chief :
Volume & Issues
Volume 3 - Oct 1963
Selecting the target year
Study of silk lousiness (I)
Journal of Sericultural and Entomological Science, volume 3, 1963, Pages 1~11
This treatise is to set up a fundamental condition of checking silk lousiness and to set up a new improving method of cocoon bave lousiness after super refining treatment. It is also studied whether silk lousiness can be eliminated through the observation of the silk gland, or the lousiness can be able to improve through such a study. The conclusions obtained in this paper are as follows. 1. Silk lousiness is able to be observed most properly when the light direction and the fiber direction are parallel in plan view of the silk cloth and the greater the angle between them is, the less the lousiness is observed. When, however, the angle is greater than some specific angle(30
), no more lousiness is observed. This specific angle is named by the author as Lousiness Horizontal Critical Angle. 2. Silk lousiness can be observed when the angle of light incidence against the silk cloth is six degrees, while the larger the angle is, the less the lousiness is observed. When, however, the angle is greater than same specific angle(45
) the lousiness disappears. Such a specific angle is named by the author as Lousiness Vertical Critical Angle. 3. The best textile composition to decrease lousiness defect is plan weave, while twill and satin weave show more lousiness with the same silk fiber. 4. Lousiness was classified as Lousiness A, B, ana C of which A was the general lousiness, B was the group type, and C was the glucose type and the standard photographs for the lousiness grading of these types were prepared. 5. The proper soap-refining hours of silk for lousiness test was eight hours. 6. The greater the difference of fiber diameter between the cocoon single bave and the splitend was, the more lousiness was composed. The normal splitends were measured as 1/4-1/5 of the main fiber. 7. The lousiness was found at the cocoon shape ends more than other parts, and found at the middle cocoon layer than other layer which was imagined to be as a result of poor uniform bave spinning of silk worm. 8. Female cocoon had more lousiness than the male cocoon. 9. It was found that there was a great possibility to have the splitends through the observation of the anatomical silkgland, and the author reached a conclusion that the lousiness can be improved to a certain degree only by the elimination of abnormal silk gland from the breeding aspects. 10. The cocoon bave of the offspring after super refining lousiness test and selection showed more improved lousiness defect than that of the parents.
Study of germination for none seasonal pruning mulberry farm and their insective diseases
Journal of Sericultural and Entomological Science, volume 3, 1963, Pages 13~21
1. In the mulberry groves for both rearing of spring and fall, the rate of germination was 74.3 percent and the rate of the unfinished bud was 25.7 percent. 2. When the summer pruning after spring rearing was not worked, new sprouted leaves from the axillary buds of an age old branches was 74.88 percent of germination and the rest from unfinished bud during the spring showed 28.12 percent. 3. In the furrows running from north to south, new buds facing the due north were the worst but towards south-east and north-east were the best in their sprouts. 4. One year-old branches which had been raised without the summer pruning in the bush types of Morus Lhou (ser) Koidz offered a habitat where Apriona Rugico1lis Cherr could live. 5. On the grove of Morus Lhou Koidz cultivated at lower zone under a higher humidity and the shortage of sun light the appearance of Anomoneura Mori Schw was likely to happen very much. 6. One year old branches without the summer pruning produced more leaves owing to a long period of growth than branches with the summer pruning in the fall crops. 7. It is necessary to reconsider a certain distance of planting because of causing, when the summer pruning was not made in the bush plantation, a obstacle of fertilizer operation or the forth coming year's management. 8. It can not be thought the ideal method for us to raise mulberry tree such as Morus Lhou Koidz under natural form and at a short distance of planting (one another). 9. Among the species, Morus alba L. had a great deal of leaves and of the rate of germination per unit length of branch.
RNA content of Bombyx mori egg during its development and irradiation effect on its RNA content (Part. 1)
Journal of Sericultural and Entomological Science, volume 3, 1963, Pages 23~28
The RNA content of fertilized egg of Bombyx mori was shown a continuing great increase reaching peak at the 5th day after egg laying and a slight decrease there after. Such a change of RNA content is considered to be directly associated with the formation and development of egg embryo of silk worm. (2) The RNA content of nonfertilized egg is much less than that of fertilized one at first day of egg laying and it increased slightly until 4 th day after egg laying then decreased. (3) The RNA content of fertilized egg irradiated by gamma-ray (3,000 r) was shown a slight increase until 2nd day after irradiation, but no change was observed there after. This fact shows that irradiation suppressed the biosynthesis of RNA silk worm egg. (4) The RNA content of HCl treated silk worm egg was shown a continuing steep rise until 7 th day after the acid treat, while no change was observed in the non-treated egg. The RNA content of HCl treated egg with irradiation of gamma-ray (1,500 r), decreased until 3 rd day after irradiation in contrast to that of non-irradiated group, but it increased rapidly from 4 th day until 7 th day after acid treating.
The Hereditary Phenomenon of Markings on the Dorsal Surface of Silkworm Eggs (II)
Journal of Sericultural and Entomological Science, volume 3, 1963, Pages 29~31
This work was carried out to know the hereditary phenomenon of. the egg markings with 4 races preserved at Sericultural Experiment Station from 1962 to 1963. The results are as follows: 1. When crosses (Fig. 1) were made between females showing reticulate egg marks and males showing collected egg markings, the F
markings were all reticulate. From the reciprocal cross was made between the collected marking females and the reticulate marking males (Fig. 2), all the F
progeny showed the collected egg markings. 2. In the F
the expected phenotype for reticulate markings (recessive) was not expressed but the collected markings (dominance) were always appeared. 3. When each F
moth was inbred, the usual 3:1 ratio was obtained. 4. The F
egg markings as well as the spindle shape egg were not determined by its own genes but by the genes of its mother, because those were formed before fertilization. The results of such influences, when they can be identified, are called material effects. And such a phenomenon was called pseudomaternal inheritance by Tanaka. (1919)
Experiment for the tussah silk reeling method
Journal of Sericultural and Entomological Science, volume 3, 1963, Pages 33~36
This experimental work is aimed to find that there is any industrial potentiality of tussah silk reeling service. The obtained results are as follows. (1) The physical nature of tussah cocoon and its silk was investigated as prelim. (2) The best silk and chemical reeling ratio of tussah cocoon was obtained in case of using 3,000 time diluted NaOH during one hour boiling process. (3) The reeling efficiency of dupion type silk (37.5g/hr) was found as a better process than that of the normal type of silk (10g/hr). (4) It is believed that there is still possibility to increase the silk reeling ratio of tussah cocoon and to industrialize the tussah silk reeling in case of processing as dupion type silk.
Studies of mulberry seedling preparation by cattage method sapling (II) Study of cultivating method of mulberry root-stock
Journal of Sericultural and Entomological Science, volume 3, 1963, Pages 37~43
This experimental work was carried out to know the best method in producing the root stock effectively. The major experimental work was carried out by using Kairyo-Nezumigaeshi, and the comparative works were carried out by using Ichi-Hei, Kairyo-Nezumigaeshi, Ro-Soh, Yongchon-Chuwoo and Suwon No. 4. Results obtained from the test are as follows. 1. The larger size of the branch burried, the better live ratio and the quality of the sapling was found, and there was no significant difference between the top part and bottom part of the branch from the point of view of the ratio, but it was found that the top part showed better live ratio and quality. Mean time there was no difference in live ratio between the two sprouts root-stock type and the three sprouts root-stock type. 2. When the live ratio and sapling quality was compared from the aspect of the new root development, the heavy and medium developed root type showed better result than the poor developed one. 3. For the ambushing depth test of the root-stock, the root-stock which was painted with paraffin on the top and exposed in the air was found to have best live ratio. Mean time, even though paraffin was not painted all the top of the root-stock, the one which was exposed the top of it or the one ambushed with thin soil layer, showed better live ratio than the one deep ambushed. 4. There was difference for the live ratio between the perpendicularly ambushed root-stock and the lied ambushed mot-stock, but the former method showed better sapling quality. 5. The soil nature did not show any difference for the live ratio between the sand loam and clay loam, but the former one showed better sapling quality. 6. There was no difference live ratio between the mulberry varieties, but Yongchon-Chuwoo showed best sapling quality. 7. The grafted sapling production cost was 2.30 won and cattage sapling cost was 1.61 won.
Muscardine of Bombyx mori and wild insects found in 1962
Journal of Sericultural and Entomological Science, volume 3, 1963, Pages 45~49
This is a forecasting report for die experiment on agent of disease to be carried on next year. 1. Muscardine of the silkworm and wild insects are supposed to be caused by a common agent, Nomuraea Pracina and Isaria Spp. 2. In the view of using the method of spreading the spores of Isaria spp to control the Dendrolimus Spectabilis Butter, the other wild insects are also supposed to be contaminated by that. 3. Hyphantria Cunea Drury does not seem to be infected by fungus of Muscardine.
Effect of the antibiotics on silkworm disease and silk quality
Journal of Sericultural and Entomological Science, volume 3, 1963, Pages 51~58
This work is to find the-remedy of silk worm diseases due to feeding them with some of antibiotics. So it is safely believed that we take the advantage of the medicine in sericulture as that in the medical fields. The results obtained indicated that it increased their weight, changed the body's color into light yellow, and made some different habits in spinning to feed the worms on some of antibiotics. In the view of those facts, we can expect to give rise to change the genotypes, and so improve the characteristics of the races in future.
Study on the chromosome number of the Korean native mulberry
Journal of Sericultural and Entomological Science, volume 3, 1963, Pages 59~60
It was prved by the author that : 1. The Smear Method with the buds of mulberry just before sprouting, can be used as one of the best methods in observation of the chromosome number. 2. The chromosome number of the Korean native mulberry is 28 in all (2n=28). 3. Triploid in mulberry can never occur under natural weather condition.
The Raw silk Size-Deviation Relationship with the Cocoon cultured in Korea
Journal of Sericultural and Entomological Science, volume 3, 1963, Pages 61~67
This report is prepared to find how the filament of cocoon bave size deviation relates with the raw silk made by them which are intensively cultured in this country. Three recommended hybrid varieties and two varieties under working at Suwon Sericultural Experiment Station were selected as specimens. The cocoons were reeled as an individual filament of every fifty meters long skein with a wrap reel to weigh the denier and to investigate the relationship of the above statement so that it may be used for the quality estimation before processing it into raw silk. The conclusions obtained are as follows. (1) The variation of Pk
Sn was found as best cocoon for 21 denier raw silk use, but the number of cocoon to make the denier has to be eight which might cause more labor cost. (2) Baektoo-Kumkang and Myohiang-Chongchon were found as economical varieties for 21 denier use. (3) Seulak-Soyang is a proper variety for the use of 14 or 28 denier silk use. (4) Myohiang-Chongchon did not confirm a good property from the aspect of denier deviation. (5) It was found that there was a fairly strong corelationship between the mean cocoon bave size deviation as indicated by Ono's report. (6) Three graphs were prepared to estimate the cocoon quality before processing into various sizes of raw silk using the mean cocoon bave size and the raw silk size to be prepared. (7) Mean time, the graph which is able to estimate the expectable grade of the raw silk size deviation was designed for the practical use. (8) The expectable grade of the varieties used in this report were found as following data. Notice (A......cocoon number to make raw silk (B......total cocoon bave size deviation (C......expectable silk grade (9) The result of the work concerning the expectable denier deviation on 21 denier silk was the same with the statistical actual testing result as 1.25 D while the distribution showed farther necessity of improvement in technically.
Urea fertilizing effect on mulberry tree
Journal of Sericultural and Entomological Science, volume 3, 1963, Pages 69~72
The purpose of this work is to investigate the effects of urea and ammonium sulfate on Kairyo Nezumigaeshi mulberry from 1959 to 1963 at Sericultural Experiment Station. The results obtained are as follows. 1. Both urea and ammonium sulfate were the same fertilizing effects. 2. The optimum fertilizer ratio of urea and ammonium sulfate for spring and summer fertilizing was 40 : 60 in case of mulberry pot culture. This was good for harvest.
Wild Morus Survey in Korea
Journal of Sericultural and Entomological Science, volume 3, 1963, Pages 73~74