Glyphosate treatment of bean seedlings causes short-term increases in Pythium populations and damping off potential in soils
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| Authors: | Descalzo, RC; Punja, ZK; Levesque, CA; Rahe, JE |
| Year: | 1998 |
| Journal: | Applied Soil Ecology 8: 25-33 |
| Title: | Glyphosate treatment of bean seedlings causes short-term increases in Pythium populations and damping off potential in soils |
| Abstract: | The effect of bean root residues on populations of known isolates and unidentified Pythium species in soils was assessed, with special regard to herbicide treatment of bean seedlings. The general Pythium population in a muck soil was significantly increased 6 days after foliar treatment of bean seedlings with glyphosate, and by soil amendment with heat-killed bean roots, but not by amendment with roots of healthy bean seedlings. The enhanced populations returned to near initial levels 4 days Later. Isolated populations of Pythium ultimum (a glyphosate-synergistic isolate) and Pythium coloratum (a non-synergistic isolate) in a sandy loam soil were enhanced approximately 10-fold over control by roots of healthy bean seedlings and by roots of seedlings killed with either glyphosate or paraquat. Distinct peaks in the population responses of P. ultimum and P. coloratum occurred at 9 and 18 days after treatment, respectively. Strong positive correlations were observed between the population estimates obtained by dilution plating and damping off of sunflower for both P. ultimum and P. coloratum. These results suggests that herbicide treatment of plants can cause temporary increases in both Pythium, populations and damping off potential of soils. (C) 1998 Elsevier Science B.V. All rights reserved. |
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