Occutrrence of Root-knot Nematodes in Sweet Potato Fields and Resistance Screening of Sweet Potato Cultivars

고구마 재배지의 뿌리혹선충 발생 상황 및 품종별 저항성 반응

  • Choi, Dong-Ro (Applied Entomology Division, National Institute of Agricultural Science & Technology, RDA) ;
  • Lee, Jae-Kook (Applied Entomology Division, National Institute of Agricultural Science & Technology, RDA) ;
  • Park, Byeong-Yong (Ginseng & Medicinal Crop Division, National Institute of Crop Science, RDA) ;
  • Chung, Mi-Nam (Evaluation and Coordination office, General Service Division, Rural Development Administration)
  • 최동로 (농업과학기술원 농업해충과) ;
  • 이재국 (농업과학기술원 농업해충과) ;
  • 박병용 (작물과학원 인삼약초과) ;
  • 정미남 (농촌진흥청 평가조정담당관실)
  • Published : 2006.08.01

Abstract

Total of 36 sweet potato field soils were sampled to survey the occurrence of the root-knot nematodes (RKN). The 61% of sweet potato fields in Haenam, 40% in Iksan and 31% in Yeju were infested with RKN, respectively. Average population density of RKN was 324 juveniles per 300 g soil. The resistance screening of sweet potato cultivars against RKN was carried out by using clay pots in a greenhouse. Average temperature under ground 10 cm in pot was 21.5$^{\circ}C$ during the test. There was no difference in number of egg sacs among different inoculation methods, however the egg-inoculation method was easy for treatlnent and had stable far results. The multiplication ratio of Melioidogyne incognita differed from 6.3 times (Jeungmi) to 63.2 times (Yulmi) by sweet potato cultivas. There were no cultivars showing resistance to M. incognita, but Jinmi, Jeungmi and Borami had resistance to if arenaria, M. hapla and M. javanica.

고구마 주산단지를 중심으로 36개 포장에서 뿌리혹선충 발생 상황을 조사한 결과 선충의 검출률이 해남 61%, 익산 40%, 여주 31%이었으며, 평균밀도는 토양 300 g당 324마리이었다. 고구마 뿌리혹선충 저항성 검정체계 확립 시험은 온실에서 화분을 이용하여 수행되었으며 시험기간동안 화분내 지하 10 cm의 평균온도는21.5$^{\circ}C$이었다. 뿌리혹선충의 접종 방법별 시험에서 접종 방법에 따른 유의적인 차이는 인정되지 않았으나, 유충을 접종하는 것 보다 알을 접종하는 방법이 처리가 쉽고 결과가 안정적이었다. 고구마 품종에 따라 뿌리혹선충의 증식량이 다르게 나타났으며(3.7$\sim$63.2배), 저항성 품종보다 감수성 품종에서 난낭 당 알의 수가 많았다. 주요 뿌리혹선충 4종에 대한 국내품종의 저항성 조사에서 고구마 뿌리혹선충에 저항성을 나타내는 품종은 없었으나, 진미, 증미, 보라미는 땅콩뿌리혹선충, 자바뿌리혹선충 및 당근뿌리혹선충에 저항성을 나타내었다.

Keywords

References

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