Abstract

본 시험은 사료용 옥수수 검은줄오갈병 피해 다발지역의 발병실태를 조사하여 종합적인 방제기술 개발에 필요한 기초 자료를 확보하고자, 2006년부터 2007년까지 제주도를 제외한 전국을 대상으로 수행하였다. 검은줄오갈병의 발생은 지역에 따라 차이가 많았으며, 발병이 심한 지역은 경기(이천), 전북(고창, 김제), 전남(영광), 경북(김천, 영주), 충남(천안, 보령)이었다. 옥수수 검은줄오갈병 다발지역에서 파종시기가 4월 26일<TEX>$\sim$</TEX>5월 15일까지 파종이 발병이 적었으며, 파종기가 4월 10일<TEX>$\sim$</TEX>20일 또는 5월 31일 이후에서 발병이 많았다. 검은줄오갈병의 발생은 옥수수 품종간의 차이는 다소 있으나 저항성을 나타내는 품종은 없었다. 옥수수 검은줄오갈병 감염에 따른 건물수량은 발병률이 높을수록 유의적으로 감소하였으며, 발병률과 옥수수 건물수량 간에는 고도의 부의상관(r=-0.86<TEX>$^{**}$</TEX>)이 인정되었다. 검은줄오갈병에 감염된 옥수수는 건전한 옥수수보다 건물소화률은 3.2%, 가소화양분총량은 3.6%, RFV는 12% 낮았으며, NDF와 ADF 함량은 각각 3.7, 4.5% 높아져 전체적으로 사료가치가 낮아지는 것으로 나타났다. This experiment was carried out to investigate the actual outbreak status of rice black-streaked dwarf virus (RBSDV) disease in forage corn for securing the basic data to control of the disease all over the country from 2006 to 2007. Outbreak of the disease showed a wide difference according to regions and was severe in Icheon, Gochang, Kimje, Youngkwang, Kimchun, Youngju, Cheonan, and Boroung provinces in Korea. Outbreak rate of the disease was effected by planting time of forage corn. Disease rate was lower in corns planted from Apr. 26 to May 15 than in those of planted from April 10 to 25 or after May 31. The corn fields planted from April 26 to May 15 showed lower disease rate than that of planted from April 10 to 25 or after May 31. Also the outbreak rate of the disease was some difference according to corn varieties but was not genuinely resistant varieties to RBSDV. Dry matter yield of forage corn was significantly decreased depending on disease rate, and was highly negative correlation to disease rate. The forage corn infected with RBSDV was lower 3.2%, 3.6% and 12% in IVDMD, TDN, and RFV, and higher 3.7% and 4.5% in NDF and ADF than those of the healthy plant, respectively.

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