• Proceedings of the Korea Information Processing Society Conference
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• 2022.05a
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• pp.417-419
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• 2022

농축업에 ICT 기술을 접목한 스마트 팜은 생육환경을 자동으로 조절하여 노동력 등을 줄이고도 생산성과 품질을 향상시키는 것이 큰 장점이다. 하지만, 수익으로 이어지는 출하량과 품질 유지를 위해서 병충해에 주의를 기울여야 함은 여전하다. 따라서 토마토 잎 병충해 발생 시, 적절한 대응을 통해 더 큰 피해를 막을 수 있으므로, 초기 증상을 포착하는 기법을 개발한다. 오픈 데이터 셋인 Ai hub 의 시설작물 질병 데이터셋과 추가로 확보한 샘플을 포함해 2 개의 충해, 4 개의 병해에 1,231 장으로 데이터셋을 직접 구성해서 학습했다. 객체 탐지와 세그먼테이션이 동시에 가능하며 작은 병변도 잘 탐지하는 모델을 사용해서 총 6 가지 병충해에 대한 뚜렷한 증상 탐지를 보여주었다.

• Korean journal of applied entomology
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• v.37 no.1
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• pp.81-89
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• 1998

In a survey on the pests of stored garlic, an unrecorded gall mite in Korea was found to damage on garlic surface making stripe feeding injuries. The mite was identified as Aceria tulipae (Keifer) 1938, based on the morphological characteristics. Light microscopic and SEM observations on garlics fed by A. tulipae revealed that there was no gall formation by feeding but there was only surface damage symptom. The damaged garlic surface showed symptom of losing gloss in the early stage and the feeding traces under dissecting microscope. Brown stripes appeared in the middle stage of damage and the whole scale turned to dark brown and shrank in the later stage. When the mite infested garlics were fumigated with 3 g/m3 aluminium phosphide for 72 hours in airtight plastic boxes (1 m x 1 m x 1 m), the mortalities of mite were over 90% for Namdo garlics.

• Korean journal of applied entomology
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• v.14 no.4 s.25
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• pp.215-219
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• 1975

The number of instars of pear sawfly larvae (Janus piri Okamoto) collected front field pear trees, were determined by measuring the width of head capsule, and the growth ratio in each instar was also studied. 1. The larval head width had six distinct peaks, which suggests that the larva of this insect passes six instars. 2. The head width tended to increase as the instars avdance, except in tile first and second instars. The coeffieient of variation decressed as the instars advanced. The growth ratio, which was similarly great in the first and second instars, decreased as the instars advanced. 3. Gains' and Campbell's formulae seemed to be more suitable than Dyer's for the determination of larval instars of this insect by the measurement of headwidth. 4. The larval instars could be inferred from the extent of damage to pear tree by this insect; that is the larvae in the second to fourth instars usually gave slight and invissible damage, while those in the fifth to sixth instars gave rapid and severe damage.

• Journal of Bio-Environment Control
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• v.22 no.2
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• pp.87-90
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• 2013

The average annual and winter ambient air temperatures in Korea have risen by $0.7^{\circ}C$ and $1.4^{\circ}C$, respectively, during the last 30 years. Due to climate change, the occurrence of abnormal weather conditions has become more frequent, causing damage to vegetable crops grown in Korea. Hot pepper, chinese cabbage and radish, the three most popular vegetables in Korea, are produced more in the field than in the greenhouse. It has been a trend that the time for field transplanting of seedlings is getting earlier and earlier as the spring temperatures keep rising. Seedlings transplanted too early in the spring take a longer time to resume the normal growth, because they are exposed to suboptimal temperature conditions. This experiment was carried out to figure out the change of cellular tissue of chinese cabbage under the condition of low temperature to provide the information regarding the coming climatic change, on the performance of 'Chunkwang' chinese cabbage during the spring growing season. In our study, plant height, number of leaf, chlorophyll and leaf area was lower at the open field cultivation than heating house treatment after transplanting 50 days. Especially in fresh weight, compared with heating treatment, open field and not heated treatment were notably low with the 1/3 level. Of damage symptoms due to low temperature cabbage leaves about 10 sheets when $-3.0^{\circ}C$ conditions in chinese cabbage was a little bit of water soaking symptoms on the leaves. $-7.4^{\circ}C$ under increasingly severe water soaking symptoms of leaf turns yellow was dry. Microscopy results showed symptoms of $-3.0^{\circ}C$ when the mesophyll cell of palisade tissue and spongy tissue collapse, $-7.4^{\circ}C$ palisade tissue and spongy tissue was completely collapsed. The result of this study suggests that the growers should be cautioned not to transplant their chinese cabbage seedlings too early into the field, and should be re-transplanting or transplanting other plants if chinese cabbage are exposed to suboptimal temperature conditions ($-3.0^{\circ}C$ or $-7.4^{\circ}C$).

• KOREAN POULTRY JOURNAL
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• v.41 no.7
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• pp.130-133
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• 2009

산란중인 계군이 별다른 원인 없이 한동안 산란저하가 발생하고 있다면 한번쯤은 산란저하증후군(EDS'76)을 의심해봐야한다. 일반적으로 농장에서 산란이 개시되기 전 산란저하증후군(EDS'76)에 대한 백신접종을 실시하면 본 질병을 의심하지 않아도 된다. 몇 년 전 일부지역에서 EDS'76이 발생한 사례가 있어 본소에 보관되어 있는 농장들의 혈청을 꺼내어 혈액응집억제반응(HI) 검사를 실시해 본 결과 다행히 감염역가가 나타나지 않았다. 그래서 국내 일부지역에 발생하고 있는 EDS'76의 발병을 예방하기 위하여 EDS'76 백신을 실시하지 않고 있던 농장들에게 일제히 백신접종을 권하여 대부분의 농장들이 최근까지 추가 피해를 경험하지 않고 있다. 그러나 EDS'76 백신(BNE 혹은 BBNE)을 실시하지 않은 계군은 언제라도 EDS'76에 감염될 수 있으므로 각별히 주의하여야 한다. 한동안 EDS'76은 국내에서 발병이 확인되지 않아 근절된 질병으로 간주되었었다. 그러나 최근 몇 년간 간간히 EDS'76의 발생이 확인되고 있으므로 농장은 결코 EDS'76에 대해 방심해서는 안된다. EDS'76은 산란계에 있어서 매우 치명적인 질병이다. 특히 케이지 사육을 하는 계군은 질병의 경과가 매우 느리고 특징적인 임상증상이 없는 것 때문에 질병피해가 커지기 쉽다. EDS'76의 특징과 발병사례를 간단히 소개하기로 한다.

• Korean journal of applied entomology
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• v.42 no.1
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• pp.77-79
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• 2003

Obolodiplosis robiniae (Haldeman, 1987) (Diptera: Cecidomyiidae), a pest species on a black locust tree, which was originally distributed in North America, is newly recorded from Korea. The specimens were collected from the central Korea. Morphological diagnoses of the both sexes and the symptoms on the host plants are provided.

• Monthly Korean Chicken
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• v.15 no.2
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• pp.97-99
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• 2009

닭은 다른 산업 동물과 많은 차이가 있다. 그중에는 질병을 일으키는 원인체의 특성도 포함된다. 특히, 닭에서는 난계대 질병이라는 독특한 질병들이 있고 면역억제성 질병이 주요한 위치를 차지하고 있다. 닭의 면역억제성 질병은 많은 종류가 알려져 있으며, 새로운 병원체에 의한 또는 기존의 바이러스나 세균의 변이에 의한 면역 억제성 질병의 유발 가능성은 항상 있다. 또한 닭은 생리학적과 해부구조학적으로 계란을 통한 병원체의 전파, 소위 난계대성 전염이 가능하다. 일반적으로 면역억제성 질병은 특이한 증상이 없이 준임상형 감염으로 나타나지만 면역억제에 의한 2차 세균감염 등에 의한 생산 성적 저하, 사계율 증가를 유발하여 경제적으로는 크나큰 피해를 일으킨다. 그러나 불행하게도 준임상형 면역억제성 질병에 의한 피해는 현격히 눈에 띄지 않으므로 양계산업 현장에서 주목을 받지 못하고 있는 것이 대부분 나라의 현실이다.

• KOREAN POULTRY JOURNAL
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• v.15 s.161
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• pp.118-125
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• 1983

항콕시듐제를 사료중에 첨가할 때 일어날 수 있는 실수는 두 가지 면에서 양계업자 들에게 큰 손실을 준다. 첫째로 항콕시듐제를 적량보다 적게 투여하거나, 배합시설의 불비로 인하여 적량이 사료 중에 함유되어 있지 않은 경우엔, 콕시듐이 심하게 감염상황인 때 5일에서 7일만에 콕시듐이 발병된다. 그 결과 콕시듐을 예방하고자 투입되는 경비와 노력이 낭비된다. 두째로 적량보다 초과하여 급여하거나 첨가될 때는 사료섭취량의 감소, 증체 및 사료 효율의 불량, 폐사수의 증가를 초래한다. 적량미달 투여와 과량 투여의 영향에 대한 실례를 상세히 기술하여 보고된 것은 그리 많지 않다. 심하게 피해가 발생하였다 하더라도 대개는 인테그레이션 회사나 사료회사 선에서 비밀에 부쳐지며, 증상은 경미하나 경제적으로 심각한 손실을 초래하는 경우에도 사양가들이 그 피해를 알아내는 쉬운 방법이 없기 때문에 그대로 지나친다. 사료중에 첨가되는 항콕시듐제의 첨가수준을 자주 분석$\cdot$점검하는 등의 품질관리 프로그램의 수립 및 이의 수행은 매우 필요한 것임을 강조하는 몇가지 실례를 소개한다.

• Journal of Korean Society of Forest Science
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• v.82 no.4
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• pp.328-336
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• 1993

This study was conducted to investigate sensitivity of tree seedlings to $SO_2$. Visible injury symptoms and changes of ethylene production were investigated in tree seedlings with the fumigation of $SO_2$ in gas chamber 4 hours a day for six days. The symptoms of visible injury did not appear below 0.5ppm level of $SO_2$ exposure but a change of visible injury with the passage of time appeared at 1.5 and 2.5ppm in all seedlings. With the higher the concentration and/or the longer exposure of $SO_2$ the visible injury symptoms on leaves increased in all seedlings. The sensitivity of seedlings to $SO_2$ was the highest in Liriodendron tulipifera followed by Pinus strobus, Ginkgo biloba, Pinus densiflora and Pinus koraiensis. The amount of ethylene production was more at 1.5 and 2.5ppm of $SO_2$ exposure than at 0.5ppm and the peak time of it came faster at higher levels. The amount of ethylene production was significantly different among tree seedlings. It showed a higher at production of ethylene in Liriodendron tulipifera compared to Ginkgo biloba and the ethylene production of Pinus trees to $SO_2$ were the highest in Pinus strobus followed by Pinus densiflora and Pinus koraiensis. In needle of Pinus strobus the ethylene production increased with the increasing rate of visible injury until the injury rate of 40-50% and than decreased with the increasing rate of visible injury since the rate of 50%.

• Journal of Bio-Environment Control
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• v.8 no.3
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• pp.183-191
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• 1999

In the recirculating hydroponics, pH of nutrient solution was gradually decreased until the middle of growing-period, and then began to go up and reached the initial level at the latter of growing-period regardless of Cu·Zn content. Changes of pH was gently down for supply of humus in nutrient solution. The growth of lettuce was good with supply of humus, but it was decreased as Cu·Zn content was increased. Although leaf chlorosis was caused by excessive content of Cu·Zn as 5, 10 ppm, it was controlled by adding humus in nutrient solution, and fresh weight of lettuce was obviously improved by adding humus.