Disparsal of Fusarium oxysporum f. sp. cucumerinum in soil
1991
Ogura, H. (Kochi Univ., Nankoku (Japan). Faculty of Agriculture)
Disparsal of Fusarium oxysporum f. sp. cucumerinum in soil was studied for seven years in field. The fungus in plant debris survived more than one year in soil but it naked in soil did only four months. There were some differences for survival and/or disparsal speed in field cropped cucumber, soybean or tomato. The former two crops gave more favourable conditions for disparsal, but the later did the worse spread. The fungus spread farther in soybean field than in cucumber field, but the mass of the pathogen in the cucumber field was more than in the soybean field. The wilt damage of cucumber appeared severely at the first year and decreased next two years though the pathogen increased by little and little. Then, the damage kept constant in high for next few years and the fungus was in stable. The pathogen colonized on young cucumber roots saprophytically increased year by year, however, the wilt damage appeared so as to go up stairs with few years interval. From these results it is clearly that the cucumber wilt pathogen disseminates to colonize on roots with utility value for its survival as parasite to host plant or as saprophyte to non host plant
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