• Korean journal of applied entomology
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• v.60 no.3
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• pp.305-312
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• 2021

This study was carried out to investigate insect pests and their damage caused to commercial amaranth in Gangneung, Gangwon-do, Korea, during 2019-2020. A total of seven families and 18 species were identified including three species of aphids, twelve species of stink bugs, and four species of moths. Among them, five species caused significant economic damage due to a large number of occurrences; Aphis fabae, Nysius plebejus, Polymerus cognatus, Spoladea recurvalis and Spodoptera exigua. Aphids started to occur from the end of April, and showed the greatest incidence in early June. Three Nysius species occurred from mid-May and showed the maximum density in late August, and then its population decreased from the beginning of September. Two species of moth caterpillars began to occur from mid-August and damaged amaranth until mid-October. Comparing the yields between amaranth plants with and without a spray of pesticides for each pest, the yield loss of seed by aphids and stink bugs were 51.9% and 69.8%, respectively. Also, the reduction rates of leaf biomass by S. recurvalis and S. exigua were 72.5% and 36.5%, respectively.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.38 no.3
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• pp.283-289
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• 1993

Effect of sulfur dioxide gas on the growth and yield of soybean growing in the On-San Industrial Complex area was evaluated using the isoquant contour lines of the sulfur dioxide in air of the area. Average concentration of sulfur dioxide monitored in the Industrial Complex from July 17 to September 17 was 0.77mg / 100cm$^2$ PbO$_2$/day. Soil pH ranged from 4.2 to 6.5. Yield losses were estimated by 5～30% due to the effect of sulfur dioxide. Liming could relieve the yield reduction to some extent. The cumulative $SO_2$ concentration, as measured by PbO$_2$ method, for two months of active vegetative growth to early ripening stage has shown a good negative correlation with soybean yield. But, pod number and 100 grain weight did not show the correlation with the concentration of sulfur dioxide. These results suggest that sulfur dioxide affect chronically and cumulatively the growth of soybean plants.

• Journal of Korean Society of Forest Science
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• v.84 no.1
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• pp.87-96
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• 1995

We examined the effects of seed treatment on field germination rate and seedling growth for four woody species, Euonymus alatus, Thea sinensis, Zanthoxylum piperitum, Nandina domestia which are economically useful in Korea. The seeds of each species were purified carefully after collection during Oct. and Nov.. E. alatus, T. sinensis, and Z. piperitum were sowed in the experimental field after stored in open ground with treatment of Pon-Pon. $H_2O_2$, $GA_3$, scarification. and N. domestica was sowed in container within green house after treatment of three different periods(7, 15, 21days) in growth chamber(4, 25, $32^{\circ}C$). Germination rate and seedling growth were measured in mid-Oct.. In E. alatus germination rate was higher in storaging in open ground after soaking in $GA_3$(67.1%) than in only storaging in open ground(18.4%). But the rate in T. sinensis showed no differences between storage in open ground after treatment of $GA_3$, and scarification, and only storage in open ground, Germination rate of Z. piperitum was much higher in storaging in open ground after treatment of Pon-Pon(80.3%) than in only storaging in open ground(12.4%). In N. domestica. seeds stored for 7 days at $32^{\circ}C$ were germinated faster than those stored for 7 days at $4^{\circ}C$, and germination rate of the former was also higher than that of the latter. Peak Times of seed germination in field were order of E. alatus (32 days). Z. piperitum (49 days). T. sinensis (83 days), N. domestica (87 days). The growth of seedling germinated in field showed a good result because of early germination following the effect of seed treatment. The periods of highest growth performances of the seedlings were 72 days in late Jun.-mid Jul. in E. alatus. 59 days in late Jun.- mid Jul. in Z. Piperitum, and 45 days in mid Aug.- mid Sep. in T. sinensis.

• Journal of Mushroom
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• v.11 no.4
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• pp.230-239
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• 2013

The major species of fungus gnats which caused the severe damage in shiitake farm were identified as a Bradysia difformis, B. alpicola, and Camtomyia cortocalis on oak log beds cultivation. The B. difformis occurred early in the middle of March while B. alpicola and C. cortocalis appeared since the beginning of May. The occurrence rate for adults of B. difformis showed highly at the end of July (11.9~1,774.2 in dong-myeon and 0.4~2,583.3 in pungse-myeon) in 2012 and mid-June (10.7~4,650 in dong-myeon and 36.8~4740 in pungse-myeon) in 2013. The counting numbers on the traps for B. alpicola reached highest peak in the middle of June (2.1~63.2 in dong-myeon and 1.0~21.7 in pungse-myeon) and the end of May (0.8~163.7 in dong-myeon and 0.5~280.5 in pungse-myeon) in 2012 and 2013, respectively. The number of C. cortocalis showed high record in the middle of May in 2012 (0.6~4.7) and in the middle of June (2.1~17.3) in 2013 in dong-myeon whereas showed the peaks in the middle of May (0.6~4.7) in 2012 and in the late of May (1.3~17.6) in 2013 in pungse-myeon. The fruiting bodies of shiitake mushroom by fungus gnats were severely damaged from mid-June to late-July and the damage rate were 0.625.5% (2012) and 0.7~30.5% (2013) in dong-myeon and 1.5%~21.6% (2012) and 1.9~36.8%(2012) in pungse-myeon. To investigate the control effect for fungus gnats by Hypoaspis aculeifer, H. aculeifer (30 mixutre of nymph and adult per $m^2$) were treated to oak log beds shiitake cultivation for six times (May 2 and 28, June 25, July 10 and 25 and August 28). The occurrence rate of adults and damage rate of fruiting bodies of 3 major species reduced 79.3% (adult numbers) and 74.8% (fruiting bodies) in dong-myeon and 64.1% (adult numbers) and 65.5% (fruiting bodies) in pungse-myeon, respectively, compared to non-treatment. Accordingly, H. aculeifer effectively controlled the fungus gnats on shiitake mushroom and can be used as good control agent.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.66 no.2
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• pp.155-170
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• 2021

Oats (Avena sativa L.) represent a good forage crop for cultivation in regions with short growing periods and/or cool weather, such as the mountainous areas of southern Korea. In this study, using the Korean elite summer oat varieties 'High speed' and 'Dark horse', we aimed to determine the optimal time to plant and harvest forage oats seeded in spring and summer in a mountainous area. Seeds were planted three times from late February and early August at 9- or 10-days intervals, respectively, and plants were harvested three times from late May to October at 10-day intervals. The experiment was carried out in an upland field (Jangsu-gun Jeonbuk) in 2015 and 2016. We investigated the changes in forage yield (FY) and quality [crude protein (CP) and total digestible nutrient (TDN) contents] based on the time of planting and harvest. Neither the forage quality nor yield of either spring and summer oats was significantly influenced by the time of planting. The CP of spring oats harvested three times at 10-day intervals from late May was 12.0%, 8.2%, and 6.5%, thereby indicating a reduction with a delay in the time of harvest. In summer oats, CP ranged from 8.4% to 8.7%, although unlike CP in spring oats, was not significantly influenced by the time of harvest. For both forage types, harvest time had no significant effect on TDN. The FY of spring oats harvested in late May and early and mid-June was 10.2, 18.7, and 19.5 ton ha^-1, respectively, with that of oats harvested on the latter two dates being significantly increased by 83% and 91%, respectively, compared with that in late May. Similarly, the FY of spring oats harvested in late October and early and mid-November was 7.1, 12.5, and 12.1 ton ha^-1, respectively, with that of oats harvested on the latter two dates being significantly increased by 75% and 71%, respectively, compared with that in late October. Taking into consideration forage yield and quality (not less than 8% CP), it would be profitable to plant spring oats in the mountainous areas of southern Korea until March 15 and harvest around June 10, whereas summer oats could be beneficially planted until August 25 and harvested from early November.

• Digital Contents
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• no.9 s.148
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• pp.102-103
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• 2005

지난달 중순 독일 라이프찌히에서 열린 신생 게임 전시회 게임컨벤션(Game Convention)이 국산 게임의 유럽진출 교두보로 부 상했다. 이 전시회는 미국 E3, 일본 도쿄게임쇼(TGS)와 함께 세계 3대 게임쇼로 불리던 영국의 ECTS가 올해부터 폐지되자, 이 공백을 메울 대안으로 각광을 받았다. 올해 4회째인 게임컨벤션은 짧은 연륜에도 불구하고 지난해 E3와 TGS에 맞먹는 10만 5,000명의 관람객이 몰렸다.

• The Bimonthly Magazine for Agrochemicals and Plant Protection
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• v.4 no.8
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• pp.50-55
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• 1983

8월은 벼농사에 있어서 매우 중요 일을 하는 시기이다. 조생종은 이삭이 나와서 벼알이 여물어가는 계절이므로 쌀의 소출이 이달중에 결정된다. 중생종도 상순에 이삭이 패면 유숙기(乳熟期) 호숙기(糊熟期)를 이달 중에 보내게 되고 만생종도 중순에는 이삭이 패는 계절이다. 벼농사의 궁극저인 목적이 좋은 쌀을 많이 생산하는 일이며 쌀이 만들어지는 시기가 8$\~$9월이기 때문에 이 기간의 벼가꾸기가 매우 중요한 것이다.

• Journal of Sericultural and Entomological Science
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• v.15 no.2
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• pp.68.1-68
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• 1973

1. 추기 적엽방법에서는 염병 따기가 눈 마름병 발생이 적었다. 2. 추기 벌채는 강벌채 일수록 눈 마름병 발생이많다. 3. 눈 마름병균의 뽕나무 가지 침입시기는 수원지방의 경우 8월중순부터 9월하순경이였다. 4. 추기 조상벌채후 11월이후 재벌채 하면 눈 마름병을 억제 할수 있다.

• KOREAN POULTRY JOURNAL
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• v.4 no.4 s.30
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• pp.54-60
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• 1972

지난 3월 중순 국회의 농림분과 위원회에 소속된 국회 의원들과 농$\cdot$축산학계의 학자들이 모여서 우리나라 농산물과 축산물의 유통문제점 및 전반적인 현황에 대하여 진지한 토의가 있었다. 이것은 아직까지 농림분과위원들조차도 외면하여 왔던 축산물에 대한 관심도의 환기와 장래 국내의 주요 식량자원으로서의 축산물에 대한 행정 당국의 관심을 환기시키는 분기점이 되리라는데 큰 의의가 있다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2009.06a
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• pp.181-182
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• 2009