1. 사과나무 부란성병해를 일으키는 병원균을 사과 주산지인 충남북, 경북등 3개도에서 조사하였으며 살균제의 효과를 실내에서 검정하였다. 2. 병윈균은 Valsa mali (부란병) 및 Botryosphaeria ribis(동부병)은 경북, 충남. 충북 등 3개도 모두 분포하며 Phomopsis truncicola (동고병)만은 충북에서는 없었다. Valsa mali는 어느 지역에서나 가장 많이 발견되었으나 천원지방에서는 Botryosphaeria ribis가 더 많앗다. 3. 저지대에 의한 Valsa mali의 산균효과나 병원균을 접종한 수피의 침투효과에서 수은제 , 석회유황합제의 효과가 좋았고 다음으로 황산옥시키노린제, 유황제가 좋았고 알콩등의 효과는 인정되지 않았다.

Apple cankers caused by Valsa mali Miyabe, Botryosphaeria ribis Cross, Phomopsis truncicola Miura, are distributed in the main apple growing areas, Choong Chung Puk Do, Choong Chung Nam Do, and Kyung Sang Puk Do. According to the survey in 1970 that Valid mali is the dominant causal organism among the three in the most severely damaged area. Valsa mali and Botryosphaeria ribis were found in ail 3 provinces, however, Phomopsis truncicola was not found in Choong Chung Nam Do. Especially, Botryosphaeria ribis was most abundant in Chunwon of Choong Chung Nam Do. Effects of chemical control of apple canker caused by Valsa mali were tested both on potato dextrose agar with inhibition zones produced by the fungicides and relative growth of assay fungus of peridermis was treated with tile fungicides. Ifost effective was mercuric and followed by Lime sulfur, Hydroquinone sulfate, in general.

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