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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 20, Issue 2 - Dec 1978
Volume 20, Issue 1 - Jun 1978
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Study on the Effects of the Phosphate and Potassium Fertilizer Amount on the Mulberry Yields
Journal of Sericultural and Entomological Science, volume 20, issue 2, 1978, Pages 1~5
The effect of phosphorus and potassium on the leaf yielding from the mulberry field was surveyed, designing four application levels of potassium and phosphorus respectively; Po, P
for phosphorus, K
for potassium after amount of nitrogen was constant at 25kg/l0a. The standard application of three elements is at 25-11-15kg/l0a. No application only showed significance among the treatments in the 3rd year autumn. However there is no significance, ever decreasing 2.7∼5.9% of leaf yielding in application of potassium and 6.4∼11.5% of leaf yielding in application of phosphorus. There is also no increase of leaf yielding even with application of double quantity of phosphorus and potassium. Potassium in soil was considerably fluctuated, while fluctuation of phosphorus is very low. With these results, it was evident that the conventional application level for phosphorus (11kg/l0a) is reasonable and for potassium may be cut down to 5∼10kg/l0a without showing any significance for the successive three years.
Effect of Egg gravity of Silkworm, Bombyx mori L., on the Hatching and the Practical Hatching Ratio (I)
Journal of Sericultural and Entomological Science, volume 20, issue 2, 1978, Pages 6~9
This experiment was attempted to investigate the effect of the specific gravity of silkworm eggs on the hatching and the practical hatching ratio depend upon six egg production companies for two silkworm races and their reciprocal crosses. 1. The hatching and the practical hatching ratio in the specific gravity of medium and heavy eggs were higher than in the specific gravity of light eggs. 2. Compare with Japanese or Chinese mother races each other, it was inclined that the former seems to be higher than the latter on the hatching ratio in the specific gravity of light and medium eggs, but the practical hatching ratio was high only in the specific gravity of light eggs. 3. Chinese mother races were different in the practical and the hatching ratio between the specific gravity of eggs. On the contrary in case of Japanese mother races were no difference for the hatching ratio but difference in the practical hatching ratio between the specific gravity of eggs. 4. On the egg production company, in case of the specific gravity of medium and light eggs, the hatching and the practical hatching ratio were high significance, but no difference in the specific gravity of heavy eggs.
Studies on the External Structure of the Cuticle of Silkworm pupa (Bombyx mori L.)
Journal of Sericultural and Entomological Science, volume 20, issue 2, 1978, Pages 10~14
There are relatively many reports have been issued on he active movement of cuticle of larva. which tend to protect their body, however, only a few reports have been disclosed on the cuticle of pupal body except the small portion of rectangle which shown tortoise-shell shape. In this connection, many portion of the external structure of pupal cuticle has been studied and the following. results were found: 1) No. spot of rectangle which is sculptured in the surface of cuticle that born by branching. out of the development of cell in imaginal bud of antenna and head were found. However, in the compound eye of net shaped sculpture was found in the (equation omitted) shaped parts which holding. the diameter of about 8u and the surrounding area has the small bump and the one is dark brown coloured comparing with shape. 2) The sculpture shape of thorax is a little different than in the head. However, (equation omitted) portion is varies from the segment to segment. In general, it is not very clear than the compound eye in the head, the dark brown bump shape is slowly fade a from the prothorax, mesothorax to metathorax. 3) The surface of intersegment membrane is colourless or slightly yellow, and the entire surface has stripped marking with thine lines. 4) In the abdominal segment, there are many and small sculptures in net shape around the (equation omitted) shape portions. 5) The size of sculpture in (equation omitted) portion of abdomen is smaller than one in thorax, and in the same segment, the dorsal is smaller than abdomen and the rear portion of the segment is larger than the front of segment. 6) After the 7th abdominal segment, no intersegmental membrane is found and the cuticle of the external structure is the same as external structure of the segment. 7) The seta is not found in head, compound eye, antenna and wing which portions were subdivided by development of imagined bud of the cell, no seta is found in cuticle of the segment in the general cell of the larva stage and also in the dorsal and intersegmental membrane.
Studies on the Relation between Allatectomy (picking out of corpora allata) and abnormal colouring pupa, Bombyx mori L.
Journal of Sericultural and Entomological Science, volume 20, issue 2, 1978, Pages 15~19
In order to identify hormone activities which related to the changing of cutaneous tissue and pupal bodies and also to identify the interaction of corpora allata hormone and prothoracic glandular band hormone which act upon the metamorphosis of the insect. The item of treatment is carried out in 5 different times at the interval of about 12 hours after 4 weeks from the first feeding of 4th instar stage, and as far as 5th instar stage in concerned 6 times of item treatments have been carried out, at about 12 hours interval after 72 hours from the molting, Item treatments were, made in the stage of spring, autumn rearing, However, during the period of post mounting stage and pre pupation by picking out of corpora allata in 5 times at the interval of hours the following change of pupal colour is observed; 1) By an early pick out of 4th instar stage, the three molters are found in greater number, However, by a later pick out the four molters are found instead of others. 2) An abnormal colour is found in the three and four molters when comparing with the control molters. 3) The most of control molters have shown the normal colour except a few samples. 4) As shown in the table 1 and 2, the death number of item treatment is greater in the autumn rearing season. 5) The picking out of corpora allata of 5th instar stage, the post mounting stage and pre pupation period is affecting the change of colour. 6) As a final conclusion, the corpora allata hormone is closely related to the changing of pupal colour.
Effect of Juvenile Hormone Analogs on Silkworm, Bombyx mori L. I. Effect of Juvenile Hormone Analog ″R-20458″on Increase of Silk Productivity by Topical Application
Journal of Sericultural and Entomological Science, volume 20, issue 2, 1978, Pages 20~25
Research on the hormones of insect has followed by the special opportunities and problems arising from pollution. Since then, the main frame of it has been energetically exploited by ligation, decapitation and so on. In the meanwhile, knowledge of the biochemistry of hormone action as well as other aspects of biochemistry in insects has been gradually disclosed. Since 1966, practical use of active analogs of the hormones has been also worked out as an insecticide and brought the features of it to the light. On the other hand, it is expected to afford the increase of silk productivity resulted from control of the fifth larval period by delaying normal development. With these regards, some of analogs have been tried to apply practically to the silkworm. One of them is "Manta" produced by Zoecon Chemical Company and it is presently used for the increase of silk productivity in Japan. Another one is "R-20458", not registered one, issued by Stuffer Chemical Company. It is still pending for the silkworm growth regulator For the possibility of practical use, two chemicals are tested on the increase of silk productivity by topical application and the obtained results are summarized as follows. 1. It is evident that the fifth larval period was extended by topical application of the tested chemicals "Manta"and "R-20458"at the fifth instar after 51 hours of the last ecdysis, ranging from 12 hours to one day, as compared to. the control 2. In survival rates, there is no significance at 5% level between control and treatments. It proved that there was no toxity to silkworm by topical aprication. 3. There is an increase of cocoon yield in both chemical treatments. It was resulted from increase of weight of single cocoon. "Manta"2.5ppm produced 22.2kg of cocoon. It is equal to 9% increase in index, as compared to that of control. In case of R-20458, the increasing rates were varied at the different concentration; 21.4kg of cocoon production with 5% increase at 5ppm, 20.9kg of it with 2% increase at 2.5ppm and 20.6kg of it with 1% increase at 1. 25ppm in index, respectively, as compared with that of control. 4. Percentage of cocoon shell was increased by topical application. In case of "Manta" 2.5ppm, it is 25.6% which is equal to 6% increase in index, as compared with that of control. For "R-20458", the increasing rates of percentage of cocoon shell were varied with the different level of chemical concentration. They are 25.0% of 4% increase at 2.5ppm, 24.9% of 3% increase at 1.25ppm and 24.7% of 3% increase at 5ppm. 15% increase was attained at "Manta" 2.5ppm in the weight of cocoon layer based on cocoon yield and percentage of cocoon shell in index, as compared with that of control. The rates for "R-20458"are 5% increase at 2.5ppm and 4% increase at 1. 25ppm in index.
The Effect of Nicotine-Contaminated Mulberry Leaf in the Vicinity of Tabacco Drying Plant on Cocoon Crop
Journal of Sericultural and Entomological Science, volume 20, issue 2, 1978, Pages 26~31
The objective of the present study was to investigate the effect of nicotine-contaminated mulberry-leaf, which was grown in the vicinity of tobacco drying plant (TDP), on cocoon crop. Mulberry-leaf harvested from the field at Sericultural Experiment Station (SES), Suweon, Korea, was used as control, supposedly nicotine-free leaf. Leaf harvested from the field in the distances of 30-50m, 300-400m and 700-800m from TDP was fed during the whole larval stage of the silkworm at. SES. The effect of leaf in each treatment level on the quantitative characters of the silkworm was summarized as follows; 1. Larval duration from 4th instar on was significantly longer in the TDP-leaf treatments than for the control. 2. Duration of matured silkworm appearance became longer as the distance of the mulberry-field from TDP got shorter, because the larval duration and growth of the silkworm were not uniform in the TDP-leaf treatments. 3. Mortality rates during the late larval, cocoon spinning, and pupal stages were highest for the 30-50m leaf, especially mortality rates during the late larval and pupal stage were serious. 4. Pupation rate was lowest for the 30-50m leaf and those for the 300-400m and the 700-800m leaf were not significantly different from that of the control. 5. Nicotine damage to cocoon weight and cocoon shell weight was significant in each TDP-leaf level. Cocoon shell ratio was reduced at the same extent in each level, compared with the control. 6. The ratio among cocoon-classes was significantly different between treatments, compared with best-cocoon ratio of 87.1% for the control. Cocoons were not uniform for the 30-50m leaf, and those for the 300-400m and the 700-800m leaf were as almost uniform as those for the control. 7. Loss of fresh cocoon yield became greater as the distance of the mulberry-field from the TDP-got shorter. In conclusion, the critical distance of mulberry-field, which influences larval health, cocoon quality and yield, appeared to be 800m from the TDP. Such other factors as wind direction and topographic location may be involved in the critical distance. 8. From the present experiment, we could obtain only the effect of nicotine on the silkworm through digestive system, since the silkworm was raised at SES in Suweon. If the silkworm.. were raised in the vicinity of the TDP, poison effect of nicotine on the silkworm could beo expected through exoskeleton and tracheal system as well as through digestive system.
Studies on the Flacherie Virus in the Silkworm, Bombyx mori L. I. Resistance to Flacherie and Ina-flacnerie Virus in the Leading Silkworm Varieties in Korea
Journal of Sericultural and Entomological Science, volume 20, issue 2, 1978, Pages 32~35
The infectious flacherie viruses are serious diseases in the silkworm, which affects the cocoon crops. However, there is only a few study on this diseases up-to-date in Korea and, in this experiment, the authors investigated the resistance of the silkworm varieties to flacherie and Ina-flacherie viruses by peroral infection. A cross, Hansaeng ＃1
Harisaeng ＃2, showed the highest resistance to the flacherie virus a Mudeung
Geumho showed the lowest resistance among the examined varieties. It seemed that the varietal difference of resistance against Ina-flacherie virus was appeared and Jam117
Hansaeng＃2 and Hansaeng＃3
Hansaeng ＃4 showed non susceptibility by peroral infection. However it was shown that Jam115
Jam116 had the lowest resistance to Ina-flacherie virus.
A Consideration of Logit Transformation for Estimating the Dosage-Mortality Regression Equation
Journal of Sericultural and Entomological Science, volume 20, issue 2, 1978, Pages 36~39
With the current advances in insect toxicant bioassay, the need for easy methods of estimating the dosage-mortality regression equation has become vital. The Probit analysis seems to be not convenient for estimating the dosage-mortality regression equation and median lethal dose(LD50) because of its complexity in calculation. This study presents a comparision between Probit and Losit transformation for the estimation from bioassay results. Validation of the two methods is presented for the pathogenecity of nuclear polyhedrosis virus to the larva of fall web worm, Hyphantria cunea D.
Sericin- Fixation of Raw Silk by Graft Copolymerization
Journal of Sericultural and Entomological Science, volume 20, issue 2, 1978, Pages 40~44
Cerium (IV) ion-initiated graft copolymerizations of acrylonitrile to raw silk were investigated in an effort to carry out sericine-fixation. The change in ceric ammonium nitrate concentration exhibited a maximum in percentage of grafting at 0.003M. Also observed was that the change in nitric acid content in reaction media gave a maximum in percentage of grafting at 0.1M. Percentage of grafting was increased generally with increase in acrylonitrile concentration, reaction time and reaction temperature. Raw silk sericin grafted with acrylonitrile was not de gummed by boiling off test and optimum graft percentage was considered at 20%.
Fixation of Silk Sericin
Journal of Sericultural and Entomological Science, volume 20, issue 2, 1978, Pages 45~49