유기농 감자재배지에서 감자역병에 의한 병 진전 및 수량감소 = Disease Progress and Yield Loss of Potato Late Blight Caused by Phytophthora infestans in Organic Farming Fields

다국어 초록 (Multilingual Abstract)

Late blight of potato caused by Phytophthora infestans is one of the most destructive disease in organic farming as well as in the conventional cultivation in Korea. Incidence and progress of the disease largely depend on climatic conditions around the fields. However, the disease completely destroys whole leaves of the plant within two weeks in organic farming fields. While, potato leaves in conventional farming fields remain healthy for 5 weeks after the first symptom appearance, because fungicides were applied four times in average to control the disease. Area under disease progress curve (AUDPC) of organic farming fields ranged from 2314 to 2421 and quickly expanded compare to that of conventional farming fields. The tuber yield in the organic farming fields ranged from 0.96 ton per 10a to 1.5 ton per 10a, while it was 2.7 ton per 10a in conventional farming fields. Tuber yields were reduced to 42~63% by the infection of late blight and the reduction rate was closely related with the time of first occurrence of the disease in organic farming fields. Physiological races of the pathogen were diversified with R0,1,3,4,5,7,10,11 in organic farming fields at Hongchun area. Pathogen races were distributed with similar pattern at different areas of organic farming fields.

참고문헌 (Reference)

1 농촌진흥청, "감자재배(표준영농교본-31)." 농촌진흥청 331-, 2003

2 Ryu, "fungicide sensitivityand physiological race of Phytophthora infestans collectedfrom Yunnan province" 33 : 126-131, 2003

3 Hahm, "de Bary at alpine area Koreaduring the period from 1971 to 1973" 227-231, 1974

4 Peters, "Variation in aggressiveness of Canadian isolates ofPhytophthora infestans as indicated by their relative abilitiesto cause potato tuber rot" 83 : 652-661, 1999

5 Derie, M. L., "Persistence of complexvirulences in populations of Phytophthora infestans inWestern Washington" 91 : 606-91 612, 2001

6 Kim, "Occurrence of potato powdery scab caused by Spongosporasubterranea in Korea" 19 : 284-287, 2003

7 Kim, "Mating type and metalaxyl sensitivity ofPhytophthora infestans isolated from Kangwon area in Korea" 4 : 59-63, 2000

8 Koh, "Changes infrequencies and distribution of A2 mating types and metalaxylresistant isolates of Phytophthora infestans in Korea" 92-98, 1994

9 Zhang, "Changes in the sensitivity to metalaxyl dimethomorphand etaboxam of Phytophthora infestans in Korea" 21 : 33-38, 2005

10 International Potato Center, "Annual report" International Potato Center 9-13, 2004

11 Miller, "Aggressivenessof isolates of P infestans from the Columbia Basin ofWashington and Oregon" 88 : -88, 1998190-197

12 Black, "A proposal for an international nomenclature of races ofPhytophthora infestans and of genes controlling immunity inSolanum demissum derivatives" 173-2 178, 1953