우려나라로 비래해 오는 벼멸구 생태형을 한기에 판별할 수 있는 검정방법과 벼멸구 발생상습지역인 경남, 전남 지역에 비래하고 있는 벼멸구의 생태형 분포비율을 조사한 결과 다음과 같다. 밀양 23호는 생태형-1,2,3에서, 청청벼는 생태형-2에서, 생태형-3에서 감로비설면적과 무게가 모두 높게 나타난 반연, 가야벼는 생태형 1, 2, 3 모두 낮았다. 벼멸구 비래시에는 생태형-3의 비율이 다소 높았으나 장에서 2세대 경과된 후에는 생태형-3이 감소하고 생태형-1과 2의 비율이 다소 증가하였는데 , 전체적으로 생태형 분포비률을 보면 1985년에 는 생태형 1,2,3이 각각 64.7%, 22.0%, 13.3%, 1986년에 는 61.2%, 21.9%, 17.0% 1987년에는 57.9%, 29.7%, 12.6%였다.

Biotypes of the brown planthopper(BPH), Nilaparvata lugens St l, population migrated from maninand China in to southern coastal regions of Korea were investigated in 1985-1987 by honeydew excretion test using Korean cultvars,, 'Milyang 23'(no resistant gene), 'Cheongcheo-ngboy'(bph 1 gene), 'Milyang 63'(bph 2 gene) and 'Gayabyeo'(bph 1 and bph 2 gene). There was a correlation between the amount of honeydew excreted and the ability of each biotype to infest resistant cultivars: 'Milyang 23' with no resistant gene was highiy susceptible to bioty-pe-1, 2 and 3 , 'cheongcheongbyeo' with resistant bph 1 was susceptible to biotype-2: and 'Milyang 63' with resistant bph 2 gene was highiy resistant to biotype-1, 2 and 3. Percent biotype dis-tribution of the female BPH collected in the southern coastal regions of Korea showed that in 1985, 1986 and 1987, the BPH biotype-1 was predominant accounting for 64.7%, 61.2% and 57.9%, respectivley, whereas bitype-2 was 22.0%, 21.9% and 29.7%, and biotype-3 was 13.3%, 17.0% and 12.6%, repestively.

• 朴永道
• 宋裕漢