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Effect of Cropping System on Disease Incidence by Soil-borne Bymovirus in Barley and on Density of the Vector, Polymyxa graminis

작부형태가 보리의 토양전염성 Bymovirus 발생과 매개균(Polymyxa graminis)의 밀도 변화에 미치는 영향

  • Park, Jong-Chul (Department of Rice and Winter Cereal Crop, NICS, RDA) ;
  • Noh, Tae-Hwan (Department of Rice and Winter Cereal Crop, NICS, RDA) ;
  • Kim, Mi-Jung (Planning and Coordination Division, NICS, RDA) ;
  • Lee, Sang-Bok (Department of Rice and Winter Cereal Crop, NICS, RDA) ;
  • Park, Chul-Soo (Department of Rice and Winter Cereal Crop, NICS, RDA) ;
  • Kang, Chun-Sik (Department of Rice and Winter Cereal Crop, NICS, RDA) ;
  • Lee, Jung-Joon (Department of Rice and Winter Cereal Crop, NICS, RDA) ;
  • Kim, Tae-Soo (Department of Rice and Winter Cereal Crop, NICS, RDA)
  • 박종철 (농촌진흥청 국립식량과학원 벼맥류부 맥류사료작물과) ;
  • 노태환 (농촌진흥청 국립식량과학원 벼맥류부 맥류사료작물과) ;
  • 김미정 (농촌진흥청 국립식량과학원 기획조정과) ;
  • 이상복 (농촌진흥청 국립식량과학원 벼맥류부 맥류사료작물과) ;
  • 박철수 (농촌진흥청 국립식량과학원 벼맥류부 맥류사료작물과) ;
  • 강천식 (농촌진흥청 국립식량과학원 벼맥류부 맥류사료작물과) ;
  • 이정준 (농촌진흥청 국립식량과학원 벼맥류부 맥류사료작물과) ;
  • 김태수 (농촌진흥청 국립식량과학원 벼맥류부 맥류사료작물과)
  • Received : 2010.07.16
  • Accepted : 2010.07.25
  • Published : 2010.08.01

Abstract

In this study, changes in virus disease occurrence and yield were monitored in conventional cropping system(rice-barley) and soybean-barley double cropping system in virus-prone area for 5 years. Also, changes in the density of Polymyxa graminis, a fungal vector, was investigated. In assay tests, mixed infection of Barley yellow mosaic virus (BaYMV) and Barley mild mosaic virus (BaMMV) was observed. Disease severity was in the range of 7~9 in conventional cropping system. In continuous cropping of soybean-barley and 3-yearfallow land, disease severity also was around 7. However, disease severity was reduced to medium level (5) when barley cultivation was paused for one or two years in soybean-barley cropping. When barley cultivation was paused for a year, the density of P. graminis, a fungal vector for BaYMV and BaMMV, reduced in barley root and soil. Similarly, barley growth was also enhanced by adopting fallow seasons. Compared with the fifth year of conventional cropping, the number of tillers per $m^2$ was increased by 158 when barley cultivation was paused for an year in soybean-barley cropping. When soybean and barley were cultivated continuously or complete fallow period was extended to three years, plant height and the number of tillers of barley were decreased. Yield components of barley in soybean-barley cropping were superior to those in rice-barley cropping. Compared with the fifth year of conventional cropping and soybean-barley cropping, culm length of barley was 1.3~2.3 cm higher and the number of tillers per $m^2$ was 36~90 higher when barley cultivation was paused for one or two years. However, those in continuous cropping of soybean-barley and 3-year-fallow land were lower compared with conventional cropping. Similarly, yield was increased when barley cultivation was paused for one or two years in the third, forth, and fifth years when compared with conventional cropping.

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