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Influence of formulated glyphosate and activator adjuvants on Sclerotinia sclerotiorum in glyphosate-resistant and-susceptible Glycine max

Published online by Cambridge University Press:  20 January 2017

Chad D. Lee ,
Donald Penner  and
Ray Hammerschmidt
Donald Penner
Affiliation:
Department of Crop and Soil Science, Michigan State University, East Lansing, MI 48824-1325
Ray Hammerschmidt
Affiliation:
Department of Botany and Plant Pathology, Michigan State University, East Lansing, MI 48824-1325
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Abstract

Two Glycine max near-isolines, GL2415 (glyphosate sensitive) and GL2600RR (glyphosate resistant), were compared for susceptibility to Sclerotinia sclerotiorum, the fungus that causes white mold disease (also known as Sclerotinia stem rot). A formulated isopropylamine salt of glyphosate (RU) at 840, 1,680, and 2,520 g ae ha−1; the RU formulation blank containing only adjuvants (RUFB) at 0.4% (v/v); organosilicone at 0.3% (v/v); a crop oil concentrate at 1.0% (v/v); and a nonionic surfactant at 0.5% (v/v) were evaluated for their influence on V5 G. max susceptibility to S. sclerotiorum in the field. The same treatments plus a formulated isopropylamine salt of glyphosate lacking adjuvants at 2,520 g ae ha−1 and a formulated trimethylsulfonium salt of glyphosate at 2,520 g ae ha−1 were applied to GL2600RR G. max in the greenhouse. Results from these studies indicated no differences in fungal growth, disease development, or G. max yield for any of these treatments. To determine if any interaction occurred between the chemicals, plants, and S. sclerotiorum, leaflets from both cultivars were dipped into and immediately removed from solutions of the RU at 4, 7, and 10% (v/v) and the RUFB and adjuvants at the rates described. The resulting lesion developments were similar across both cultivars but not across chemical treatments. Lesion developments were smaller on leaflets treated with RUFB and RU, but larger on leaflets treated with the other three adjuvants. Sclerotinia sclerotiorum mycelia growing on potato dextrose agar were inhibited by high concentrations of RU and of RUFB at 100 mM ae glyphosate and by the three adjuvants at 1% (v/v). Formulated glyphosate lacking adjuvants did not inhibit mycelial growth on potato dextrose agar. The glyphosate resistance trait did not appear to be associated with the susceptibility of G. max to S. sclerotiorum. Neither the glyphosate resistance trait nor the applications of glyphosate and adjuvants influenced G. max susceptibility to S. sclerotiorum.

Keywords

GlyphosateGlycine max (L.) Merr. ‘GL2415’, ‘GL2600RR’, soybeanSclerotinia sclerotiorum (Lib.) de BarrySclerotinia stem rot, white mold diseaseFormulationtransgenic cropsplant disease
Type
Research Article
Information
Weed Science , Volume 48 , Issue 6 , December 2000 , pp. 710 - 715
Copyright
Copyright © Weed Science Society of America 

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