• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 1993.10a
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• pp.23-24
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• 1993

전문가 시스템이란 어떤 분야의 전문가가 가지고 있는 문제해결능력을 컴퓨터 프로그램화한 것이다. 수박에 관하여 풍부한 지식을 가지고 오랜 경험을 쌓은 전문가들은 수박병에 관해 신뢰성 있는 진단을 내리고 적절히 대응할 수 있다. 하지만 일반 농민들은 병해에 대하여 많은 지식을 가지고 있지 못할 뿐만 아니라 해당 지역에 잘 발생하지 않는 병이 발생했을 때 전문가의 도움을 필요로 하는 경우가 많을 것이다. 본 연구에서는 수박을 오랫동안 재배하여 경험과 지식이 풍부한 전문가로부터 수박병 진단을 위한 규칙을 알아내어 수박병 진단을 위한 전문가 시스템(그림 1)을 개발하였다. (중략)

• Korean Journal Plant Pathology
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• v.12 no.4
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• pp.428-431
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• 1996

참외, 수박, 오이의 주요 시설재배단지인 경북 성주, 칠곡, 고령에서 1992년부터 3년간 이들의 주요 병해인 덩굴쪼김병, 덩굴마름병, 탄저병, 노균병, 흰가루병 및 잿빛무늬병의 연작수해에 따른 발생량을 조사하여 이들 병의 방제 기초자료로 활용코자 하였다. 토양전염성병균에 의한 병해인 덩굴쪼김병, 탄저병 및 참외와 수박의덩굴마름병은 연작해수가 많을수록 유의적으로 발병율이 증가하였다. 덩굴쪼김병의 경우는 1∼3년과 10년 이상 지배지에서 참외 0.6%와 2.5%, 오이 0.3%와 4.2%, 수박 0.7%와 3.3%로 전체적으로 발병율이 낮아 연작에 따른 발병율의 차이가 작았으나, 덩굴마름병과 탄저병은 이 두재배지의 차이가 커 연작장해가 심하게 나타났다. 세 박과 식물중에 수박이 연작에 따른 병발생율 증가 폭이 다소 높았다. 토양전염성병이 아닌 참외와 오이의 노균병과 흰가루병, 오이의 잿빛 무늬병은 연작수해에 따른 병발생의 유의적인 차이가 없었고, 이들 병해는 발생은 시설재배지의 재배환경과 밀접한 관련이 있었다.

• The Bimonthly Magazine for Agrochemicals and Plant Protection
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• v.12 no.6 s.105
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• pp.94-101
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• 1991

우리나라 수박재배에서 가장 큰 문제가 되는 병해는 덩굴쪼김병(만할병), 덩굴마름병(만고병), 탄저병, 역병(돌림병)이라 할 수 있다. 이외에 5$\~$6가지의 병이 발생하고 있으나 상기 4가지 병해에 비하면 발생면적도 적고 피해도 일반적이지 못하다. 덩굴쪼김병은 접목재배에 의하여 피해가 경감되고 있으나 수박재배 경험이 풍부하지 못한 농민들은 이 병해 때문에 실패하기 쉽다. 덩굴마름병은 특히 시설재배에서 피해가 큰데, 전생육기간동안 기온이 낮을 때 발생하므로 해마다 농민들이 골치를 앓는 병해다. 탄저병과 역병은 시설재배보다는 노지재배에서 훨씬 많이 발생하며 그 피해도 대단히 크다. 특히 이 병해들은 강우와 밀접한 관계가 있으며 약제를 살포할 여유도 없이 급진전하므로 잠깐 소홀히 한 사이 포장이 수박전체가 피해를 입는 경우가 허다하다. 여기에서는 앞서 이야기한 4가지 병해를 중심으로 발생생태와 효과적인 방제방법을 알아본다.

• Journal of Bio-Environment Control
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• v.3 no.1
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• pp.28-35
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• 1994

An expert system, Watermelon Disease Expert System (WDES), was developed in this study using HCLIPS which allows input and output in Korean. WDES could diagnose 8 diseases and 1 physiological disorder frequently occurring on watermelons grown in greenhouses. The knowledge base of WDES consisted of 35 ‘IF -THEN ’rules and the forward chaining was used to make inferences. Help menu providing information on the nature of questions in text and image forms was included for users to answer questions without difficulty. Watermelon growers and researchers have validated the system and proved possibility of its practical use. In order to facilitate the practical use of WDES by watermelon growers, the knowledge base of WDES needs to be improved by including more detailed information on various diseases and disorders and restructuring rule bases.

• Korean Journal of Breeding Science
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• v.42 no.6
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• pp.695-698
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• 2010

The incidence of Anthracnose causing severe damage to the foliage and fruit in watermelon has increased in some major watermelon producing areas in Korea. To develop anthracnose resistant line, 'AU-Producer' having resistant gene to anthracnose was selected from germplasm and crossed with high quality line '920533'. Following the initial cross, backrossing and disease screening were performed to select resistant lines that produced high yields with excellent quality fruit. As a results of these procedure, a mid maturing watermelon line, 'Hangyeol' with resistance to anthracnose (Colletotrichum orbiculare) race 1 and 3 was developed at the National Institute of Horticultural and Herbal Science, Rural Development Administration (RDA). It has red flesh and commonly produces fruit with clear stripes on skin between 5.3 to 10.1 kg. Average soluble solid contents are ranged from 9.8 to 11.8$^{\circ}$Bx. The yield and quality of 'Hangyeol' is comparable to or better than those harvested from the popular commercial cultivars. The achievement of this experiment could contribute to provide the resistant parents in an anthracnose resistance breeding program in watermelon.

• Korean Journal of Breeding Science
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• v.42 no.6
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• pp.699-702
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• 2010

Anthracnose is a major limiting factor of the watermelon production in Korea. A mid-late maturing watermelon line, 'Hanbit' with resistance to anthracnose (Colletotrichum orbiculare) race 1 and 3, was developed by the cross between anthracnose resistant cultivar 'AU-Producer' and high quality inbred line '920533' at the National Institute of Horticultural and Herbal Science, Rural Development Administration (RDA). 'Hanbit' produces 5.4 to 9.5 kg of red flesh fruits with clear stripes on skin. Average soluble solid contents are ranged from 10.4 to 11.2$^{\circ}$Bx. The yield and quality of 'Hanbit' was comparable to or better than those harvested from the popular commercial cultivars. 'Hanbit' can be cultivated in open fields and under the protected green house condition. In addition to the commercial production, it can be used as a resistant material in $F_1$ hybrid breeding program.

• Research in Plant Disease
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• v.12 no.2
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• pp.125-128
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• 2006

Downy mildew caused by Pseudoperonospora cubensis (Berkeley & Curtis) occurred on the cotyledon of gourd (Lagenaria leucantha cv. Sambokkkul) and scion of watermelon (cv. FR couple) in commercial nursery around Jinju city, Gyeongnam province in Korea in 2005 and 2006. The disease symptoms usually started with water-soaking lesions on cotyledon and then the infected leaves became withered and eventually died. The sporangia of the pathogen were one-celled, ovoid to ellipsoid in shape, pale grayish in color, and $20{\sim}32{\times}14{\sim}18{\mu}m$ in size. Sporangiophores were errect, branched, and $140{\sim}380{\times}4{\sim}8{\mu}m$ in size. Pathogenicity of the causal organism was proved according to artificial inoculations. Although the virulence of the causal fungus on the host plants was not strong, it produced typical symptoms. The causal organism was identified as Pseudoperonospora cubensis (Berkeley & Curtis) based on the mycological characteristics of the fungus and pathogenicity. This is the first report on downy mildew of watermelon caused by P. cubensis in Korea.

• Research in Plant Disease
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• v.22 no.2
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• pp.72-80
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• 2016

Gummy stem blight, caused by the fungus Didymella bryoniae, is major disease of watermelons worldwide. The objective of the present study was to establish an efficient screening system to identify watermelon resistant to D. bryoniae. An GSB3 isolate was prepared from a watermelon plant showing typical symptoms of gummy stem blight in Haman-gun and identified as D. bryoniae based on molecular analysis of internal transcribed spacer sequence. A simple mass-production technique of inoculum was developed based on spore production of D. bryoniae GSB3 under several incubation conditions and their virulence on watermelon plants. Resistance degrees of 22 commercial watermelon cultivars to the GSB3 isolate were evaluated. Among them, four watermelon cultivars showing different degree of resistance response were selected for further study. Development of disease on the cultivars according to various conditions including inoculum concentrations, incubation periods in dew chamber, and incubation temperatures was investigated. From the results, we suggest an efficient screening method for resistant watermelon cultivars to gummy stem blight. Seeds of watermelon cultivar are sown and grown in a greenhouse until plant stage of 2-fully expanded leaves. Seedlings are inoculated with D. bryoniae by spraying spore suspension of the fungus at a concentration of $5.0{\times}10^5spores/ml$. The infected plants are incubated in humidity chamber at $25^{\circ}C$ for 48 hours and then transferred to a growth chamber at $25^{\circ}C$ and 80% relative humidity with 12-hour light a day. Three to four days after inoculation, disease severity of the plant are measured using percentage of infected leaf area.

• Plant Disease and Agriculture
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• v.2 no.1
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• pp.38-39
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• 1996

• Plant Disease and Agriculture
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• v.3 no.2
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• pp.5-11
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• 1997