Synergistic role of soil fungi in the herbicidal efficacy of glyphosate
1990
Rahe, J.E. | Levesque, C.A. | Johal, G.S.
The death of plants treated with the herbicide glyphosate involves certain soil fungi that function as glyphosate synergists. Glyphosate also kills plants without the participation of these fungi, but significantly higher doses of the herbicide are required. The contribution of glyphosate synergistic fungi to herbicidal efficacy is readily seen by comparing the doses of glyphosate required to kill plants in heat treated and untreated soils. Glyphosate renders the roots of treated plants permissive to fungal colonization well in advance of overt symptoms of phytotoxicity, presumably by interfering with natural defense mechanisms in the roots. Common airborne recontaminants of heat treated soils are ineffective as glyphosate synergists. The major glyphosate synergists of wheat and bean seedlings growing in diverse soil types were Pythium and Fusarium spp.
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