Quantitative studies on the relationship between plowing into soil of clubbed roots of preceding crops caused byPlasmodiophora brassicaeand disease severity in succeeding crops
| Autor: | Takayuki Akimoto, Hiroharu Murakami, Seiya Tsushima, Yukiko Kuroyanagi, Yoshihiro Shishido |
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| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Soil Science and Plant Nutrition. 50:1307-1311 |
| ISSN: | 1747-0765 0038-0768 |
| DOI: | 10.1080/00380768.2004.10408609 |
| Popis: | The effect of the plowing of clubbed roots of cracifers on the population of Plasmodiophora brassicae in soil was quantitatively studied by measuring the number of resting spores produced in the diseased plants. Though the mean number of resting spores per diseased plant increased with the increase of the disease severity, it remained almost identical for the disease severity classified into category 3 among host species and cultivars tested. Mean number of resting spores per diseased plant ranged from 9.3 to 10.9 (log) regardless of the value of the disease index. When the number of resting spores in soil was calculated based on these data and plant cultivation methods, the values were equivalent to 4.8-6.4 resting spores g-1soil (log)where clubroot disease occurred severely. The value of the disease index of Chinese cabbage plants grown in the pots where clubbed roots of initially grown plants had been plowed into soil (plowing plot) was higher than that in the pots where no plants had been gro... |
| Databáze: | OpenAIRE |
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