• 제목/요약/키워드: Agricultural damage

검색결과 1,114건 처리시간 0.03초

솔잎흑파리 피해림의 소나무 생장에 관하여 (On the Growth of Pine Tree in the Damaged Forest by the Needle Gall Midge)

  • 임경빈;임웅규;황종서
    • The Korean Journal of Ecology
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    • 제1권2호
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    • pp.66-71
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    • 1977
  • The growth of red and black pines in Muan, Seochen, Gapyeong and Kochang areas was compared by means of the growth of annual ring width and stem analysis to study the process of damages caused by pine needle gall midge. Red pine forest of Seocheon area began to suffer by pine needle gall midge from 1961 and the damage was to becoming severe from 1967. The damage became so intense tha tmany forests are withering to death from spring of 1975. Black pine forest also began to suffer from 1973. Red pine forest of Muan area was supposed to be suffered from 1973. Red pine forest of Kochang area suffered by pine needle gall midge from 1967. It seems that the damage became severe from 1973 and that black pine forest was also badly damaged from that time. Red pine forest of the control plot, Gapyeong area, began to suffer from 1967 and it also became intense from 1973. Although the areas of Seocheon, Muan, Kochang, and Gapyeong are different from each other in terms of locality and the infitration period of pine needle gall equally from 1967 due to mass development of population or other factors and the damage became more intense from 1973. Black pine forest was also badly damaged from that time. Black pine seems to be stronger in insect resistant than red pine. This can be justified by the fact that it began to suffer belatedly in each area and the degree of damage is moderate. The damage of Seocheon area is the severest following Kochang. Muan area is relatively moderate but the forest becoming decrease in growth.

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DNA Repair of Eukaryotes Associated with Non-coding Small RNAs

  • Kang, Han-Chul;Yoon, Sang-Hong;Lee, Chang-Muk;Roh, Kyung Hee
    • Journal of Applied Biological Chemistry
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    • 제56권1호
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    • pp.37-42
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    • 2013
  • In eukaryotes, most of the genome are transcribed, however only a small proportion of total transcripts encodes for protein, thus resulting in many of noncoding RNAs. In order to recover DNA damage including DNA double-strand breaks (DSBs) eukaryotes have evolved complex mechanisms and these are processed through coordinated mechanisms of protein sensors, transducers, and effectors including RNAs. During recent years, small RNAs have been increasingly studied and gradually considered as key regulators in various aspects of biology. Upon DNA damage, small RNAs including diRNAs (DSB induced RNA) are generated in both plant and human cell lines. Inhibition of their biogenesis has severe influence on DSB repair system.

대파에서 파좀나방 가해 특성과 여름기간동안 유충밀도에 따른 피해해석 (Injury Characteristics of Allium Leafminer, Acrolepiopsis sapporensis (Lepidoptera: Acrolepiidae) in Welsh Onion and Damage Assessment According to Larval Density Levels during Summer)

  • 박홍현;김광호;박창규;최용석;이상계
    • 한국응용곤충학회지
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    • 제51권4호
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    • pp.383-388
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    • 2012
  • 본 연구는 여름기간동안 대파에서 파좀나방 밀도에 따른 피해수준을 분석하고, 해충관리의 기초자료인 경제적피해수준을 제시하고자 수행되었다. 2009년부터 2010년까지 수원지역 대파 재배포장에서 성페로몬 트랩을 이용한 성충 발생 모니터링 결과, 3~5월, 9월에 특히 많은 개체가 채집되었다. 파좀나방의 가해양상은 유충이 잎을 뚫고 들어가 내부에서 갉아먹으면 잎 표면이 초록빛을 잃고 하얗게 변하였고, 구멍이 생겨났다. 유충 1마리가 전체 유충기간동안 평균 1.6개 잎을 가해하였고, 11.9개의 구멍을 냈으며 피해면적은 $1,321.6mm^2$에 달했다. 망사케이지에 파좀나방 유충을 밀도수준별로 접종한 결과, 파좀나방 밀도수준에 따라 파의 평균 엽수의 감소와 피해엽률의 증가에 따라 총 수량 및 상품수량이 감소되었다. 피해해석 결과, 해충밀도와 피해엽률간에는 고도로 유의한 정(+)의 상관관계가 있는 회귀식을 구할 수 있었다. 이 식을 이용하여 대파의 상품화율 93%를 감안하여 설정한 피해한도인 피해엽률 7% 수준에서 파좀나방의 경제적 피해수준은 10주당 유충 1마리로 추정되었다.