Effect of soil flooding on the survival of Fusarium oxysporum F. sp. pisi and Fusarium solani F. sp. pisi
1991
Tu, J.C. (Agriculture Canada, Harrow (Canada). Research Station)
This investigation demonstrated that pea plants grown in root rot infected soil previously flooded with water developed less severe root rot than in infested non-flooded soils. Pea seeds sown in the soil with various duration of flooding at different temperatures showed that decrease in root rot severity in plants correlated with increased duration of flooding and increased temperature during flooding. Assays of fungal and bacterial populations were conducted in the flooded and non-flooded soils. Number of viable propagules of both bacteria and fungi decreased slowly with time in non-flooded soil. In flooded soil, the number of viable fungal propagules decreased more rapidly, particularly with longer duration of flooding (6 and 8 months) and at higher temperatures (25 degree Celsius and 30 degree Celsius). In addition the population of viable bacterial propagules increased in the flooded soils. Bacillus sp. and fluorescent Pseudomonas sp. were the predominant microflora in the flooded soil. It is concluded that flooding soil for a period of 4 to 8 months might reduce or eliminate Fusarium oxysporum f. sp. pisi and Fusarium solani f. sp. pisi. Thus, subsequent pea planting should exhibit less root rot.
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