Abstract
Incidence of rice stripe disease, caused by Rice stripe tenuivirus (RSV), was surveyed during 2002 to 2004. The incidence area and ratio of diseased fields were decreased gradually during those period. Rate of diseased plants were 45.8%, 45.0% and 43.7% in the susceptible cultivars Chucheong, Saechucheong and Ilpum, respectively. However, the rate was 4.4% in resistant cultivar Hwaseong. In addition, breakdown rate was also significantly high in the susceptible cultivars in Chucheong, Saechucheong and Ilpum showing 33.6, 33.2 and 31.9%, respectively. In Hwaseong, the breakdown rate was 0.8%. Collection efficiency was compared between two insect vector collection methods. Insect-sucking machine method was much more efficient than sweeping net method in collecting small brown plant hopper (SBPH). According to the survey of the population density of the insect vector during 2002 to 2004, the national average population density was gradually decreased year by year, 3.6, 2.3, and 1.3%, respectively. This result was significantly related with the decrease of the incidence of rice stripe disease. Control efficiency of rice stripe disease by treating several seedling box and water surface with insecticides against SBPH resulted that imidacloprid GR, Fipronil FG, Clothianidin+Probenazole GR and Thiamethoxam GR showed over 80% of control efficiency at 28 days after treatment at the early stage in nursery.
2002년에서 2004년에 걸쳐 전국적으로 Rice stripe tenuivirus(RSV)에 의한 벼줄무늬잎마름병의 발생지역과 발생 포장율을 조사한 결과, RSV에 의한 발병은 점진적으로 감소하였다. RSV의 발생주율은 감수성 품종인 추청과 새추청, 일품에서 각각 45.8, 45.0 43.7%로 매우 높은 데 반해 저항성 품종인 화성에서는 4.4%로 낮았고, 좌지주율 역시 추청과 새추청, 일품 품종에서 각각 33.6, 33.2, 31.9%인데 비해 화성에서는 0.8%에 그쳤다. 두 가지 보독충 채집방법간의 효율성을 비교한 결과 기존의 포충망 채집에 비해 동력흡충기를 이용한 채집이 매우 효율적이었다. 2002년부터 2004년에 걸쳐 전국적으로 보독충 밀도를 조사한 결과, 연도별로 전국적인 평균 보독충율은 각각 3.6, 2.3, 1.3%로 시험기간에 걸쳐 보독충율은 전반적으로 감소하여 병 발생이 감소할 것으로 예측하였다. 이앙전 육묘상의 육묘상처리제 및 수면전개제 처리에 의한 애멸구 방제 효과를 조사한 결과, Imidacloprid 입제 등 4종 처리제의 약효가 인정되었다.
