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Studies on root diseases of spinach and soil scientific research on the occurrence 1. occurrence of root diseases in sapporo city japan and root rot common name kamairazu by aphanomyces cochlioides


Studies on root diseases of spinach and soil scientific research on the occurrence 1. occurrence of root diseases in sapporo city japan and root rot common name kamairazu by aphanomyces cochlioides



Bulletin of Hokkaido Prefectural Agricultural Experiment Stations 53: 9-20



Severe outbreaks of the root diseases of spinach caused by continuous cropping are becoming a serious problem recently in Hokkaido. However, reports of this type of research on these diseases have apparently not been published as of yet in this prefecture. Therefore, the research on the occurrence and pathogens have been carried ou in 45 fields around Sapporo city, being the largest area for spinach growing in Hokkaido. In this research, the reason for this unaccountable injury "Kamairazu" was sought. Kamairazu can be literally translated as "things out without a sickle". This phenomenon occurs in fields because root-rot tap root is sometimes broken off from the surface of the soil due to high wind or during times when agricultural chemicals are being sprayed over the fields. The results obtained are as follows: 1. Some serious spinach root diseases showing symptoms of damping-off, wilting and root-rot have been found more in field that have been used for continuous cropping for more than three years. The occurrence of these diseases was less in spring period (less 2%) and most prevalent in the middle summer and early fall periods (nearly 20%). 2. The fungi that were isolated most frequently from the diseased plants were Fusarium and Pythium followed by Aphanomyces. Rhizoctonia occurred the least. It seemed that Fusarium were isolated most fequently from the wilting plants of the middle growing stage and the harvesting stage in August and September, Pythium from the damping-off plants in June, and Aphanomyces from the root-rot plants of cotyledon and middle growing stages in July and August. It was confirmed from inoculation tests that some fungi of the four kinds of fungi mentioned above are pathogenic to spinach. 3. Aphanomyces were detected more frequently from "Kamaisazu" plants in middle growing stage and the harvesting stage. It was confirmed from the spinach inoculation tests that three fungi of Aphanomyces isolated diseased plants were pathogenic to 5-leaf stage plant and caused the same symptom as that in cropping area. These Aphanomyces were identified with A. cochlioides Drechsler from a comparison with the sex organs of authentic Aphanomyces and the results of the inoculation tests on various plans. Consequently, it was elucidated that "Kamairazu" is Aphanomyces root-rot which occurs in the middle growing stage and the harvesting stage. In addition, Aphanomyces root-rot of spinach in Hokkaido was discovered for the first time during this research.

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Studies on root diseases of spinach and soil scientific research on the occurrence 1. Occurrence of root diseases in Sapporo City and root-rot (common name: kamairazu) by Aphanomyces cochlioides. Bulletin of Hokkaido Prefectural Agricultural Experiment Stations 53: 9-19, 1985

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