토양에 첨가한 8종의 Oil cake 중 Margosa, Undi, Karanj cake은 생강뿌리썩음병의 발생을 억제하였다. 생강수량의 증진효과는 Karanj, Roselle, Mustard cake의 순으로 높았다.

뿌리썩음증상은 병징에 따라 3가지로 대별되었다. 뿌리썩음증상은 Pythium aphanidermatum을 선접종 후 Fusarium solani를 후접종 하였을 때 가장 심하였다. 뿌리혹선충과 Phthium aphanidermatum과의 상호작용은 없었다. 근경 발아는 각 처리에서 현저히 증가하였고 Alliette 0.25% 처리에서 가장 높았다. 토양관주에 의한 치료 및 예방효과는 Alliette, Burgandy mixture, 다이센 M-45, 디포라탄이 우수하였으며, 수량도 증가하였다.

This study was carried out to investigate the characteristics of Rhizome rot incidence of Platycodon grandiflorus by cultivation period and ridge width and furrow depth. The three types of ridge width 0.8, 1.0, and 1.2 m and several levels of furrow depth and 6 levels cultivation period. This experiment was done in farmer's farm and the treatments were also classified in the same spot. In this investigation, ridge width, soil water content, soil hardness, and cultivation period were positively related with Rhizome rot incidence, however, furrow depth was negatively related with that. So this experiment could draw a conclusion : excess water damage and soil hardness could directly or indirectly effect on the Rhizome rot incidence, so cultivation method should be developed such as making underground ditch or cultivation in well draining soil for escaping excess waster damage.

생강 근경썩음병 길항균 Bacillus polymyxa 'HB26-5' 균주를 이용한 생물적 방제 가능성을 알아보기 위한 배양적 특성 및 제형화, 근권정착률을 조사한 결과 배양적온은 25℃였고, 배지의 산도는 7.0에서 생육이 좋았으나 시간이 지남에 따라 초기에는 pH6.I~6.5의 약산성으로 되었다가 7일 후에는 pH7.8~8.2의 약알칼리성으로 변하였다. 길항균의 토양정착을 돕기 위해 첨가된 유기물중 쌀겨와 피트 또는 쌀겨와 카올린을 혼합한 제제가 토양처리 후 7주까지 길항균의 밀도 변화가 가장 작았다. 그러나 실제 노지포장에 처리하였을 경우 3주 후부터 밀도가 떨어지기 시작하였다. 제형의 경도,크기 등 물리적 특성과 길항균의 밀도유지 등을 고려할 때 알긴산 나트륨 2%, kaolin 15%, 쌀겨 3%를 혼합한 제형이 가장 우수하였다.

Sixteen isolates showing relatively strong antagonicity against the ginger rhizome rot pathogen, Pythium zingiberum, were selected among the 155 isolates from ginger rhizome surfaces and rhizospheres of ginger cultivation fields in Wanju, Chonbuk. The isolate, 'HB 26-5'showing the strongest antagonicity was finally selected by testing duration of inhibition effect and pathogenicity to ginger. The isolated antagonistic microorganism, 'HB 26-5' was rod shape, gram positive and formed endospore. The isolate produced acids utilizing glucose, arabinose, xylose and mannitol, and acetoin at VP test, and grew anaerobically. Temperature range for growth was from 10 to 40℃ . Reaction to catalase and gelatin, hydrolysis were positive, and casein hydrolysis and indol production were negative. Based on the mycological characters and the fatty acid composition, it was identified as Bacillus polymyxa. The pathogenicity test of isolated Bacillus polymyxa 'HB 26-5'on 22 crop cultivars resulted that only the lettuce was influenced in germination, and the others were not affected.