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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 10 - Dec 1969
Volume 9 - Jan 1969
Selecting the target year
Studies of the Physiological Impediments on the Silkworm(Bombyx mori L.) due to Anthracite Gas -Regarding with Carbon Monoxide and Sulphur Dioxide-
Journal of Sericultural and Entomological Science, volume 10, 1969, Pages 1~25
Since widely use of anthracite for the radiating purpose in a rearing room in Korea, the weakness of silkworm, poor uniformity of the worm growth, the increase of missing worm ratio, unusual cocoon assorting ratio, and the decrease of cocoon layer ratio have been realized by the author, therefore, he has started out to search the mechanism of these evil influences regarding with various gas densities and terms of the gas treatment which will be supposed to be a warning for temperature control during the silkworm reading work. Among the anthracite gas components, CO or SO
influence and their complexed harm effect were investigated through the use of anthracite gas, CO and SO
gas. Meantime, each treatment was applied, separately, during the worm egg stage, young instar, adult instar and whole instar, because the harm intensity for any improperable rearing condition is flexible by the growing stages. Meantime, the gas density and term variation were applied for the above each treatment such as in case of anthracite and CO gas, the following treat methods were used. 1) 0.06% for 30 mins. 2) 0.06% for 1 hour. 3) 0.1% for 1 hour. 4) 0.15% for 1 hour. on the other hand, SO
gas was used as 1) 120ppm for 30 mins. 2) 200ppm for 30 mins. 3) 400ppm for 30 mins. The measurement of gas density was proceeded by using CO tester (Carbon Monoxide Indicator) and SO
tester (Indicator Sampler Cgf) which could keep any specific density before each treatment.
Studies on the variation of mulberry yield in various parts of mulberry field
Journal of Sericultural and Entomological Science, volume 10, 1969, Pages 27~33
This study was carried out to investigate the variation of mulberry yield in various parts of mulberry field. The results obtained from the study are summarized as follows. 1. For all the varieties, higher yield was observed side part than in the middle part. 2. With respect to the direction of field, the side faced south produced the highest yield, which was followed both side parts faced east and west. The side part fated north also produced relatively high yield. 3. No significant difference in yield was obtained between the central part and the near the each side, even the former seemed to be some what higher in yield than the latter. 4. Such a variety as Kaeryangsuban havins small leaves on many twigs with small internodes appeared to have more side effect than the otherwise variety, i.e. Rosang. 5. The variety Kaeryangsuban, showed more side effect in spring than in Autumm, however Rosang showed reversed effect. 6. Similar results were obtained in the leaf dry weight. 7. As a conclusion, it can he an important factor to increase yield to set up the mulberry field in east and west resulting less side effect.
Studies on the Estimation of Leaf Production in Mulberry Trees IV. Estimation of Spring Leaf Yield by the Measurement of Some Characters
Journal of Sericultural and Entomological Science, volume 10, 1969, Pages 35~40
Various formulae for estimation of spring leaf production in mulberry trees were calculated and obtained. Four varieties of mulberry trees were used as the materials, and four characters, namely branch length (X
), node number (X
), branch diameter (X
) and branch number per stock (X
) were studied. The formulae to estimate the leaf yield of spring mulberry trees are as follows: 1.
= 108, 1496＋59.4533X
, are showed the estimated yield of the each variety, namely Gaeryang Seuban, Ilchirye, Nosang, and Suwon Sang No. 4, respectively. X
denote the measured values of branch length and node number, respectively. 2.
, are the estimated yield of the each variety, namely Gaeryang-Seuban, Ilchirye, Nosang, Suwon Sang No 4, respectively. X
denote the measured values of each character, branch length, node number, branch diameter and branch number per stock, respectively. 3.
, are the estimated yield values of four varieties, and X
, denote the measured values of four characters, namely branch length, node number, branch diameter and branch number per stock, respectively. The estimation method of mulberry spring leaf yield by measurement of some characters, in autumn the year before, could be the better method to determine the leaf yield of mulberry trees without destroying the leaves and without weighting the leaves of mulberry trees than the other methods.
Heritabilities of Some Characters of Mulberry Trees
Journal of Sericultural and Entomological Science, volume 10, 1969, Pages 41~43
The experimental studies were intended to clarify the effects leaf yield calculations, and also aimed at estimating the heritabilities on some characters for the selection of desirable stocks of mulberry trees. The method of estimating heritabilities for the eight characters-branch length, node number, branch diameter, branch number per stock, total branch weight, old branch weight, new shoot and leaf weight, and leaf weight, was the variance components procedures in a replicated trial for the varietal lines. The results are summarized as follows: Means, variances and standard errors for the characters are shown in table 1, and the results of variance analyses are also shown in table 2. Heritability values of node number was the highest, and these of branch number per stock was the lowest, and these of other six characters were intermediate values. These all calculated heritability values were higher than anticipated. This was expected since these values, which were the broad sense heritability, contain the variance due to dominance and epistasis in addition to the additive variance.
Studies on the culture of mulberry tree on slope land
Journal of Sericultural and Entomological Science, volume 10, 1969, Pages 45~52
This experiment was carried out to investigate the factors causing obstructions to the productivity of mulberry field on slope land, increasing the productivity of that, in Korea. These results are summerized as follows: 1. Poor fertilization and unreasonable management due to overbalance of mulberry field in scale were proved to be most important factors of them obstructing the growth of mulberry. Therefore, it is necessary to increase the amount of fertilizer and cultivate mulberry fold in reasonable scale for the development of productivity. 2. As the direction of mulberry fold on slope land are closely related to the productivity, mulberry cultivation of the eastern or southern exposure were suitable, but that of northern not. It seemed to show no difference between the cultivation in 20 degree slope land and in less than that, 300 m above sea level and below that level. 3. A depth of top soil should be more than 60 cm. 4. Rosang in varieties of mulberry tree is not suitable but Chuwoo is comparatively suitable in slope land. 5. The number of mulberry trees in planting must be more than 900 trees per 10 ares.
The comparable test of the chemicals on control effects of mulberry die-back disease.
Journal of Sericultural and Entomological Science, volume 10, 1969, Pages 53~55
1. This experiment was made for a comparable test of five different chemicals on control effects of mulberry die back disease from the autum of 1967 to that of 1968. These chemicals were EMP, PMF, lime sulfur, chlon, and PMA. 2. The experiment showed the EMP and PMF were the best chemicals among those for controling it, and the others no significance comparing with the control. 3. The best way was a twice sprang of 150
EMP(1/1500 con.) per 10ar to the base of branches to the full extent through september and october.
Studies on the deacidification times of artificial hatching silkworm eggs
Journal of Sericultural and Entomological Science, volume 10, 1969, Pages 57~58
Artificial silkworm eggs must do washing the acid completely after soaking HCl. Author experimented following deacidification times: 30 minutes, 1 hour, 2 hours, 6 hours soaking and 12 hours soaking eggs in the fresh water after artificial hatching, and incubated room temperature. There was no difference 1 hour's with control but more than 1 hour deacidification influenced badly in hatching ratio. Especially above than 6 hours deacidification was not only delaying 1 day in hatching date but also decreasing in practical hatching ratio.
Studies on the modified dark incubation
Journal of Sericultural and Entomological Science, volume 10, 1969, Pages 59~62
It is very important physiological and economical problems to hatching within a day by increasing hatching-ratio of silkworm eggs in sericulture, and modified dark incubating method was experimented in Japan. The author studied on the economical problems of that rather than physiological study. Hatching was induced and accelerated by illumination before hatching 5 days which incubated in the dark room after eye spot pigmented eggs emerged 10-20 percentage. It was increased by 80-90％ in hatching-ratio, but the hatching was delayed a day. In autumn silkworm, newly hatched silkworms were hatched silkworms were hatched in the dark room because of high temperature period tough modified dark incubation was passed only 4 days. The author wonder which is more effective between effect of increasing the hatching-ratio and the health of silkworms.
On the change of glucose and phosphorus of the silkworm eggs Bombyx, mori. L. during it development and the effect of
Journal of Sericultural and Entomological Science, volume 10, 1969, Pages 63~66
As a result of analyzing the change of material substance of all sorts biochemically and comparing the control with
-ray irradiation (800r, 400 min), incubating the silkworm egges (bombyx. mori. L.) as the objective in the process of growth of embryo shortly before hatching, the following conclusion has been found. 1. Glucose has shown the increase of 281.2 mg/g in control during the pigment stage and it has shown the increase of 179.6 mg/g in
-ray irradiation during the same period. The difference in quantity between the former and the latter is due to the fact that the growth of embryo has been influenced by the radio active. Glucose has changed with phosphorus the other way round. 2. Control organic phosphorus has shown the increase of 5.23 mg/g during the Byong B or KI A in which organ and tissue in the embryo has been formed. Organic phosphorus in
-ray irradiation has shown the increase of 5.73 mg/g during KI B. Inorganic Phosphorus has shown only a little change in the control and
-ray irradiation. The phosphorus in both has shown a little quantity in the
-ray irradiation in early period of incubation. After the Ki A embryo, it has increased rapidly and it has increased till the hatching more continually than in control. The about results of the research will be helpful and instructive to the betterment and improvement, breeding and management of animals and plants.
On the hybrid vigor of F
Journal of Sericultural and Entomological Science, volume 10, 1969, Pages 67~72
In order to analyse the correlation between the parents and their hybrids in the silkworm, which were reared in spring, the author has surveyed the various quantitative characters which are significant in genetics, and the hybrid vigor rate. The duration of larvae life is shorter in F1 Value an in the mid parents value, cocoon size biffer, pupa rate, cocoon crop from ten thousand silkworms just molted in the fourth instar, total cocoon weight and cocoon layer weight increases in comparison with the mid parents value. Although cocoon layer ratio only shows increasing by 0.3％ or so, it is too little to admit the effect. F1 value is nearly equal to parent value and there is no correlation between F1 hybrids value and their mid parents value.
The studies on microbe isolated from the cocoon in Korea
Journal of Sericultural and Entomological Science, volume 10, 1969, Pages 73~75
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
-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.
Studies on the Estimation of Silk Yield in Cocoon Layer
Journal of Sericultural and Entomological Science, volume 10, 1969, Pages 77~80
The purpose of this study is to find out reasonable method for the estimation of silk yield in cocoon layer. Two season's cocoons were used as the materials, and three characters, cocoon weight (X
), cocoon layer weight (X
), and cocoon layer ratio (X
) were studied. The formulae to estimate the silk yield of cocoon weight are as follows: 1. Estimation of silk yield in cocoon weight of the spring cocoons. 1). the case of cocoon weight 200 cg above; Y= 12.93＋0.0863X
2). the case of cocoon weight 180～200 cg; Y= 18.59＋0.1354X
3). the case of cocoon weight 160～180 cg; Y= 133.39-0.4400X
4). the case of cocoon weight 160 cg under; Y-71.74-0.213X
2. Estimation of silk yield in cocoon weight of the autumn cocoons. 1). the case of cocoon weight 180～200 cg; Y=214.07-0.8078X
2). the case of cocoon weight 160～180 cg; Y=40.16-0.0264X
3). the case of cocoon weight 130～160 cg; Y= 86.64-0.3352X
4). the case of cocoon weight 130cg under; Y=207.76-1.4579X
Studies on the cocoon Boiling by the Infra red-ray Heater
Journal of Sericultural and Entomological Science, volume 10, 1969, Pages 81~88
This study was carried out to investigate the effects of the cocoon cooking by infra red ray heater established in to the cocoon boiling machine. The results were summarized as follows. 1. According to the cocoons, the non bave end breaking percentage of cocoons was increased to 5∼9％ in spring and 2∼10％ in autumn. 2. There was no significant in the raw silk percentage. 3. The irradiation effect by the number of infra-red ray heater was different, namely, the raw silk percentage of the excellent cocoons was increased in case of 1 Kwatt irradiation, and that of the inferior cocoons was increased in the 2 Kwatt irradiation. 4. Reeling efficiency was showed to 14％ maximum and 3％ minimum(index).
Studies on the Actual Status of Sericultural farmer in Korea. -With Emphasis on the Technical Factors-
Journal of Sericultural and Entomological Science, volume 10, 1969, Pages 89~97
Analysis of the Korean Filatures Management
Journal of Sericultural and Entomological Science, volume 10, 1969, Pages 99~105
The results of investigation and management analysis for the silk filatures in Korea until 1968 are evaluated as followings. (1) The average cocoon purchasing amount for a filature was found as 10,800kg and they are processed 105kg per man on the cocoon assorting process, 8,683kg per day during the drying process of which 42 percent are dried with low temperature drying system. (2) The average cocoon cooking capacity is 50 g, cocoon per minute, but the cooking capacity per man is smaller in case of larger factory. (3) The silk production capacity per month per a filature is 6,000kg and the amount gets smaller in case of larger factory. (4) The employee cost per one kg of raw silk production was found as high in smaller factory and it was found that 200~300 sets size was the optimum capacity for operation. (5) In case of multiends silk reeling machine, the employee cost for the silk reeling process acts as the most peculier factor among six different cocoon processes and it is reached to conclued to deduct the number of employees for this process in order to deduct the production cost. (6) The correlation coefficients between cost factors and total labour cost was found as 46 percent, therefore the rest (54％) will be the production cost other than labour cost.