• 식물병연구
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• 제20권1호
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• pp.8-14
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• 2014

The socio-network activities for regional governments, agricultural research institutes, developing agencies and policy makers of any countries are very crucial and important to take into account the root cause of current problems faced by farmers. The survey was conducted in South Korea during the period January, 2008 to August, 2012 in order to shed light on prevalence of different diseases on watermelon in different regions and to better understand farmers' knowledge and perceptions for following watemelon's growing procedures and practices. A total of 590 cases were reported on 573 watermelon growers with highest 87.1% in Jeonbuk, 4.7% in Jeonnam, and 8.2% in other regions such as Gyeongbuk, Gyeongnam, Chungnam, Gwangju, Gyeonggi, Daegu, Gangwon, Changwon and Seoul. The maximum percentages of cases recorded were related to diseases and insect pest (38.6%) followed by physiological disorder (29.7%), cultural practices (18.8%), soil and fertilizer (9.0%), herbicide (2.9%) and others (1.0%). It was observed that the manifestation aspects of the diseases were changed due to increasing in proportion of 'in-facility' cultivation to 12,995 ha compared to 'open-field' cultivation (2,722 ha). The present survey revealed the necessity to reduce the damages incurred at watermelon farms as soon as possible through the breeding program to develop resistant cultivar, use of pathogen-free propagating plants, and efficient prevention of pathogen by regular monitoring of watermelon plants at farms.

• 한국응용곤충학회지
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• 제56권2호
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• pp.195-201
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• 2017

곤충병원성 곰팡이 Zoophthora radicans (Entomophthorales: Entomophthoraceae)가 혹명나방, 배추좀나방, 복숭아혹진딧물과 진딧물인 미분류 1종을 감염시키는 것을 발견하였다. 이들은 전라북도 진안, 김제, 익산에서 수집되었고, 6월과 9월에 관찰이 가능하였다. 이 균에 감염된 혹명나방은 진안에서 수집되었고, 감염율이 46%에 달하였다. 감염된 곤충 충체로부터 균을 분리하여 Sabouraud dextrose agar with yeast extract (SDAY)를 이용하여 인공배양을 시도하였다. 그 결과, $20{\sim}28^{\circ}C$가 인공배양을 위한 최적온도로 판단되며, SDAY보다 SDAY supplemented with egg yolk and milk (SDAY-EM)에서 발육이 보다 양호하였다. 이 곰팡이는 자연적으로 발생함을 포장에서 확인할 수 있었다.

• Mycobiology
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• 제31권3호
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• pp.139-144
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• 2003

This study was conducted to investigate physiological characteristics of Trichoderma spp. isolated from Pleurotus spp. Damage tests of Pleurotus spp. and mycotoxins tests of Trichoderma spp. were also done. The optimal growth temperature of Trichoderma spp. was $27{\sim}30^{\circ}C$. Although, T. longibrachiatum was able to grow at $37^{\circ}C$ and grew $30{\sim}40$ times faster than Pleurotus. The colony colour on PDA medium of T. cf. virens was yellowish green, T. longibrachiatum was yellow, and T. harzianum was turning to bright green. In damage tests of Pleurotus by Trichoderma, T. cf. virens caused the most severe damage to Pleurotus. T. longibrachiatum and T. harzianum caused less damage on Pleurotus but were able to cause greater damage to P. eryngii. One of the mushroom cultivars, P. ostreatus 8 was the most resistant to all Trichoderma spp.. Chitinolytic mycotoxin released by Trichoderma spp. caused 52.7% damage to Pleurotus. Mycotoxins released by T. longibrachiatum caused the greatest damaged(78.6%) on P. eryngii.

• 한국동물위생학회지
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• 제43권2호
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• pp.53-58
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• 2020

Enterovirulent Escherichia coli are among the most important causes of diarrhea in cattles. Between January and December, 2017, a total of 150 stool specimens from cattles were investigated for enterohaemorrhagic E. coli (EHEC), enteropathogenic E. coli (EPEC), enteroaggregative E. coli (EAEC), enterotoxigenic E. coli (ETEC) and enteroinvasive E. coli (EIEC) using real-time PCR. 131 E. coli were isolated from feces. The most frequently isolated pathotype in feces was EHEC (37 isolates). EPEC, ETEC and EAEC were detected in feces with 14, 7 and 3 respectively. EIEC was not detected. Antimicrobial resistance test was performed by agar disc diffusion method with 14 antimicrobials. Enterovirulent E. coli isolates showed the highest antimicrobial resistance to ampicillin 61.3%, followed by tetracycline 54.5% and streptomycin 45.5%. They had low resistance to amikacin 11.4%. Of 44 isolates, 37 (84.1%) were resistant to more than 2 antimicrobials. futher study a highest antimicrobial susceptibility to trimethoprim/sulfamethoxazole 50.0% and florofenicol 47.7%.

• 한국버섯학회지
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• 제11권3호
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• pp.145-148
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• 2013

목이버섯의 톱밥종균을 제조하는데 참나무톱밥은 영양원으로 미강을 20%첨가하고, 포플러톱밥은 밀기울을 10%첨가하였을 때 목이버섯의 균사와 밀도가 양호하였다. 이때 봉지재배에 적합한 종균 접종양은 참나무톱밥종균은 15 g, 포플러톱밥종균은 25 g를 접종할 때 오염발생률이 줄고 배양완성률이 높아 적합한 접종양 이었다.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2003년도 생물공학의 동향(XII)
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• pp.511-511
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• 2003

• 한국동물위생학회지
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• 제39권1호
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• pp.59-63
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• 2016

Duck circovirus (DuCV) has been recognized as a contagious immunosuppressive virus affecting many duck species worldwide. To determine the prevalence of DuCV infection in ducks, we investigated 104 samples collected from 50 duck farms in Jeonbuk province with the polymerase chain reaction (PCR). Among collected samples, 40 (38.5%) were positive for DuCV. The prevalence of DuCV PCR-positive samples increased with age. Genomic sequences of 15 DuCV strains were determined and compared with previously available DuCV sequences in public databases. Phylogenetic analysis revealed that all strains were clustered into DuCV-1 group.

• 한국동물위생학회지
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• 제38권1호
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• pp.57-59
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• 2015

This study was carried out to investigate the Sacbrood virus (SBV) of Korean native honeybees causing serious damage in Jeonbuk area. Korean native honeybees completing the after overwinter 60 farms and March to April active phase adult bees and larvae 52 farms were collected from farms in 7 counties. Active phase of the adult bees 39 (75.0%) and larvae 24 (46.2%) farms was infected with SBV in 52 farms. This result indicate that SBV was the highest in Imsil-gun than other areas.

• 한국유기농업학회지
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• 제19권spc호
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• pp.92-95
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• 2011

The initial investment of rice cultivation by mechanical technique was high. This was only due to the cost of planting machine. We analysed the overall cost (without machine cost) and benefits of the two methods, it manifested that the mechanical method is very much beneficial over traditional rice cultivation technique. We observed that the requirement of soil, irrigation water, number of seeds etc. decreased in mechanical cultivation technique while net income increase by 13.07% with 80% government subsidy. Furthermore, the initial rooting was quicker, growth and development of pot raised seedlings was better than the traditional technique. Hence, this technique can give better return to the farmers with the help of government subsidy.

• 한국유기농업학회지
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• 제19권spc호
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• pp.135-138
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• 2011

In traditional organic rice culture practices, control of weeds is a big problem. This study was conducted to increase the rice production. Results showed that Plant height, SPAD, root length and weight were higher in pot raised seedling than broadcasting method except number of panicles. High plant density caused reduction in plant height, number of culm and chlorophyll content of the rice. No lodging was observed in both methods. Thickness of third internode and culm length was more in pot raised seedlings at both sites. When organic material was used rice yield increased by 3.81%. Higher rice production (10%) was recorded in the fields planted with pot raised seedlings. From the above study it could be conclude that the pot raised seedlings perform better than the seedlings raised by broadcasting methods.