• Korean journal of applied entomology
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• v.31 no.2
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• pp.144-152
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• 1992

The juvenile hormone(JH) titers and juvenile hormone esterase (JHE) activities were mea¬sured in larval homogenates of the chestnut gall waL,J, Dryocosmus kuriphilus Yasumatsu, parasiting a susceptible and two resistant chestnut ( Cheuk-Pa, and Dan- Tak) varieties by GLC, Galleria wax test and Liquid scintilation counter. JH of the chestnut gall wasp was identified as JH- I. Their juvenile hormone titers were 35,800 GU/g(Cheuk-Pa), 30,900 GU/g (Dan-Tak), and 28,600 GU/g(susceptible variety). The juvenile hormone esterase activities were 1.48 n mole/min/ml(Cheuk-Pa), 1.63 n mole/min/ml(Dan- Tak), and 1.89 n mole/mini ml(susceptible variety). JH titer activity of the chestnut gall wasp parasiting resistant varie¬ties were higher than that from susceptible, whereas their JHE activity was higher in those from susceptible variety than those from resitant varieties. JH titer and JH specific esterase activity was inversely proportional.

• The Science & Technology
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• v.11 no.1 s.104
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• pp.38-40
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• 1978

일본은 1979년에 완공을 목표로 차성현에 자성현에 축파연구학원도시를 건설중에 있다. 이미 과학기술청 산하의 무기재질연구소 국립방재과학기술센터 환경청 산하의 국립공해연구소(본지1977년 6월호에 소개) 문부성 산하 고에너지 연구소 축파대학등이 이전신설을 완료하여 새로운 연구원도시로서 활기를 대기 시작하고 있는데 시년에는 농림성 관계 연구기관의 이전이 본격화 되고 있다. 즉 열대농업기술연구센터,식물바이러스연구소의 개소에 이어 과수실험장,농업토목연구소,임업실험장이 가까운 시일내에 전시설의 정비를 끝내고 개소할 예정이며 금년도에는 식품종합연구소, 가축위생실험소가 그리고 내년도에는 농업기술연구소,축산기술연구소,단사실험장, 농사실험장의 일부가 이전할 예정이다. 이 이외에도 농림성의 과수화목과 축파분실(가칭)과 농림수산기술회의 사무국의 일부도 입주할 것이라 한다. 용지 총면적은 474.5핵터, 건물용지는 227.4핵터에 이르고 있다. 이들 농림성 산하 연구기관이 집중된 지역을 흔히 농림단지라고 부르고 있다. 이번에는 최근 식물 바이러스 연구소를 중심으로 농업단지를 소개한다.

• Journal of Korean Society of Forest Science
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• v.102 no.1
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• pp.7-14
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• 2013

This study investigated the optimum condition of abrasion peeling machine and pellicle peeling ability of chestnut (Castanea spp.) varieties for the efficient production of peeled chestnuts. The optimum conditions were 50 minutes peeling time and 27 rpm of drum rotation speed and chestnut pellicle peeling ratio was 89.3%. Among 8 Korean chestnut varieties which were peeled under the optimum condition (27 rpm/50 min), 'Tsukuba (89.3%)', 'Tanzawa (72.2%)' and 'Ishizuchi (70.9%)' showed the highest ratio of pellicle peeling ratio. 'Tsukuba' had the most excellent peeled (grade I) chestnuts (77.3%), followed by 'Ishizuchi (46.7%)', and 'Tanzawa (45.0%)'. Regarding the chestnuts quality for commercialization, 'Tsukuba' had the most excellent peeled chestnuts (90.5%), followed by 'Tanzawa (74.8%)', and 'Ishizuchi (74.3%)'. 'Mipung (37.2%)' had the most broken and injured chestnuts and 'Tsukuba (5.9%)' had the least broken and injured chestnuts. Therefore this study concluded that 'Tsukuba' was the superior variety for producing high value-added processed chestnuts.

• The Magazine of the Society of Air-Conditioning and Refrigerating Engineers of Korea
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• v.8 no.3
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• pp.158-164
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• 1979

1979년 8월 9일 축파연구학원도시를 견학할 기회를 가졌으며, 동경상야역에서 오전 9시 출발, 전차로 약 50분 토포역에 도착 택시로서 본 연구학원도시에 이르렀으며, 그 규모와 관발과정을 다음과 같이 전하고자 한다. 오후 5시까지 연구학원도시내의 각 시설물을 될 수 있는대로 많이 보려고 노력하였으나 워낙 방대한 시설로서 결국은 그 일부를 본것에 지나지 않음을 유감으로 생각한다. 이러한 새로운 도시를 건설하는데 있어서 계획의 진행, 움직이는 조직 기구, 연차계획 등은 참고가 될 것으로 본다.

• Korean journal of applied entomology
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• v.44 no.2
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• pp.157-159
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• 2005

The number of winter buds oviposited by Drycosmus kuriphilus against chestnut varieties was lower of Ishizuchi and Daap than that of Okkwang, Tsukuba and Arima. D. kuriphilus oviposited multiful eggs in each winter bud of most of the chestnut varieties tested. More than three eggs were oviposited on winter bud of lower shoot of native, Tsukuba, Okkwang and Pyounggi varieties. However, average laid eggs less than one were on winter buds of Tshizuchi and Daap. Number of eggs oviposited in winter bud on lower shoot was higher than those on upper one. More than 15 eggs were oviposited in Tsukuba, whereas one or less egg was oviposited in Daap. Rates of winter buds oviposited by D. kuriphilus in native, Arima and Tsukuba were 83.8, 78.5, and $75.9\%$, respectively.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.12
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• pp.362-368
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• 2020

In this study, the gallic acid content of various varieties of chestnuts (Daebo, Okgwang, Chukpa, Samjosaeng) was investigated during the period between May 2018 to July 2019. A quantitative analysis was performed by HPLC using extracts of chestnut, inner skin, outer skin, branches, chestnut, male flower, and the male flower for each type of chestnut tree. Gallic acid was identified by dissolving standard gallic acid in water and analyzed three times in the concentration range of 100, 200, 250, and 500ppm. Linearity was confirmed by the peak area ratio at each concentration. Among the different chestnut varieties, the gallic acid content was highest at 0.0863% in Chukpa, followed by Daebo, Okgwang, and Samjosaeng. While comparing the average gallic acid content of each part of the chestnut tree, it was observed that the falling male flower had the highest content at 1.2100%, followed by chestnut leaves, chestnut pines, and branches. In a comparison of the inner skins, the Daebo variety had the highest gallic acid content at 0.7463% followed by Chukpa, Okgwang, and Samjosaeng. The outer skin of Samjosaeng had the highest content at 0.4918%, followed by Chukpa, Daebo, and Okgwang. The pines of the Samjosaeng chestnut had the highest content at 1.3035%, followed by Daebo, Chukpa, and Okgwang.

• Journal of the Korean Society of Food Science and Nutrition
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• v.11 no.3
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• pp.41-46
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• 1982

To elucidate the preservative characteristics of chestnuts, three varieties, Ungi, Okkang and Chuckpa, were stored in cellar, polyethylen film packing, and box with or without $\gamma-irradiation$, and chemical compositions, rates of sprouting and rotting were determined during the period of storage. The chemical compositions of raw chestnuts were: moisture, 59 to 63%; total sugar, 28 to 29%; reducing sugar, 0.1 to 0.2%; crude fiber, 0.6 to 0.9%; crude protein, 3.5%; vitamin C, 27 to 28mg%; and tannin, 50 to 58mg%. Total sugar and vitamin C were decreased during the period of storage, and of reducing sugar and tannin were increased. The rates after 6 months of storage after three vareitia were; 93 to 100% by the cellar storage; 35 to 57% by the box storage without $\gamma-irradiation$ and 1 to 4% with $\gamma-irradiation$; and none by the polyethylene film packing. The sprouting rate in Chuckpa decreased markedly as compared with the other two varieties. The rotting rates when stored for 6 months were: 4 to 6% by the box storage without $\gamma-irradiation$ and 7 to 12% with $\gamma-irradiation$; 5 to 8% by the polyethylene film packing; and 30 to 54% by the cellar storage. The rotting rate in Chuckpa was lower than the other varieties during the period.

• Journal of agriculture & life science
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• v.45 no.2
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• pp.61-67
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• 2011

To provide basic data for variety improvement of chestnut cultivated in southern Korea, nut characteristics were investigated during 2008-2010. The number of burr by variety ranged from 37.7 in Kwangjujoyul to 183 in Juok. There were significant differences among variety in number of nuts per burr, and Idea had the least number of nuts per burr (1.2), while Sandae and Kwangeun had the largest (2.0). Nut weight also showed a distinct difference among variety, and Kwangdeok had the heaviest, while Kwangjujoyul had the lightest nut weight. Changbanggamyul showed the highest healthy nut rate of 89.9%, and Kunumi, Arima, Tsukuba, Kwangeun, and Pyeonggi had the rate of healthy nut of more than 80%. Sinyipyeong and Isseumo showed the high rate of rot nuts of 10.8 and 16.8%, which was needed to give attention to nut storage. Split pericarp percentage ranged from 0% in Changbanggamyul to 20.6% in Saeil, and that was above 15% in Sandae, Riheiguri, Juok, Kwangdeok but Kunumi, Arima, Tsukuba, Manseong, Changbanggamyul, Chuckpabyunii, Isseumo had the split pericarp percentage of less than 3%.

• Korean journal of applied entomology
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• v.50 no.4
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• pp.379-382
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• 2011

The damage rates of peach pyralid moth(Dichocrocis punctiferalis), which damages the chestnut fruits, were investigated annually from 1995 to 2010 according to year, region, and maturity. The damage rate by D. punctiferalis was the highest (34.5%) in 1998 and was the lowest (17.9%) in 2000. The pattern of the damage rate showed a repeating three-year cycle. There was a negative correlation ($-0.6261^*$) between rainfall and damage rate. There was a positive correlation ($0.5826^*$) between temperature and damage rate. The average damage rate of all surveyed regions was 22.2%. Of the surveyed areas, Hapcheon had the highest at 27% and Hamyang had the lowest at 15.0%. The damage rate of chestnut fruit depending on the maturity was 26.1% in an early maturing cultivar (Dantaek), and 19.3% and 21.1% in a late maturing cultivar (Eungi) and a medium maturing cultivar (Chukpa), respectively.

• Korean Journal of Agricultural Science
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• v.29 no.1
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• pp.32-43
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• 2002

The peach pyralid moth (Dichocrocis punctiferalis) is reported as import ant pest insect to chestnut fruits in Asia including Korea. For seasonal occurrence of D. punctiferalis in 1996, 1998 and 1999, D. punctiferalis adults were collected by light trap and sex pheromone wing trap in the chestnut orchard. Also, damaged rate of chestnut fruits were examined each collecting site. In 1996, according to examination by using light trap at three different site in Kongju, the occurrence peak of 2nd gene ration of D. punctiferalis adults was early August. Collected individuals after September were cons ide red as 3rd generation. Damaged rate due to maturation type was 26.5% averagely. The order of damaged rate were early, late and middle maturation type as 35.04%, 19.35% and 26.03%, respectively. Using synthetic sex pheromone trap at Kongju, Cheungyang and Buyeo in 1998, occurrence peaks were occurred mid-August to 2nd generation and late September to 3nd gene ration in Kongju. However, from early-August to late-September 5 peaks were occurred sequentially in Cheungyang. Second generation adults were occurred in mid-August and 3rd ones were occurred from late-September to early-October in Buyeo. In 1999, occurrence peaks of 3rd generation were early, middle and late September in Kongju, Cheungyang and Buyeo respectively. Damaged rate were 6.8%, 6.6% and 15.3% in Kongju, Cheungyang and Buyeo, respectively. Damaged rate order due to variety were Eunki, Chukpa, Danpa, Bokpa, Wangjung, Byunggo57, Yuoma at Buyeo and were Chukpa, Dukmyung, Byunggo57 at Cheungyang in 1999. Damage rate of chestnut were different with variety. Eunki and Chukpa in Buyeo and Chukpa and Dukmyung in Cheungyang were more damaged by D. punctiferalis respectively.