초록

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리지나뿌리썩음병(病)에 의한 소나무림(林)의 군상고사(群狀枯死) 현상(現象)이 강릉지방(江陵地方)에서 발견되었는데 흑갈색(黑褐色)의 부후반점(腐朽斑點), 방사상(放射狀) 부후(腐朽)흔적 및 모래덩이 형성등(等)이 이병목(罹病木)의 뿌리에서 관찰되었다. 년간(年間) 피해(被害) 확산거리(擴散距離)는 약(約)6m였으며, 포착목(捕捉木)에 의하여 이병목(罹病木) 토양중(土壤中) 병원균(病原菌)이 검출(檢出)되었다. Rhizina undulata의 자양포자(子襄胞子)는 $37^{\circ}C$ 24시간(時間) 또는 $40^{\circ}C$ 17시간(時間) 열처리(處理)에 의하여 발아(發芽)되었으며, PDA배지(培地)에서 균사(菌絲)의 생장이 양호하였고, 최적생장온도(最適生長溫度)는 $25-30^{\circ}C$ 배지(培地)의 최적(最適)pH는 5.6-6.3이었다. 試驗管내(試驗管內)에서의 접종실험결과(接種實驗結果), 침엽수가 활엽수보다 감수성(感受性)을 나타내었다.

Abstract ▼ AI-Helper

A group of Pinus densiflora trees attacked by Rhizina root rot were observed at Kangnung. Diseased roots are characterized by rot patches, radial rot traces or formation of adhesive soil masses. The damage has proceeded about 6m per annum, and the pathogen in the infected soil was detected by trap l...

A group of Pinus densiflora trees attacked by Rhizina root rot were observed at Kangnung. Diseased roots are characterized by rot patches, radial rot traces or formation of adhesive soil masses. The damage has proceeded about 6m per annum, and the pathogen in the infected soil was detected by trap logs. Ascospores of Rhizina undulata was germinated by heat shock at $37^{\circ}C$ for 24 hours or at $40^{\circ}C$ for 17 hours. The mycerial growth was optimum on PDA medium at $25-30^{\circ}C$and pH 5.6-6.3. Coniferous trees were more susceptible than non-coniferous trees in inoculation test in vitro.

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