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Effect of Three Desiccant Herbicides on Soybean (Glycine max) Seed Quality

Published online by Cambridge University Press:  12 June 2017

Raymond F. Cerkauskas
Affiliation:
Dep. Plant Pathol., Univ. Illinois at Urbana-Champaign (UIUC)
Onkar D. Dhingra
Affiliation:
Dep. Fitopatologia, Univ. Federal de Viçosa, 36.570 Viçosa, Minas Gerais, Brazil
James B. Sinclair
Affiliation:
Dep. Plant Pathol., 1102 S. Goodwin Ave., UIUC, Urbana, IL 68101
Stephen R. Foor
Affiliation:
UIUC

Abstract

Soybean [Glycine max (L.) Merr.] cultivars ‘UFV1’ and ‘UFV2’ grown at Viçosa and Florestal, Brazil, and ‘Bonus' and ‘Wells' at Urbana, Illinois, were sprayed at growth stages R5.5 to R6 (full-pod) or R7 (50% defoliation) with the desiccant/herbicides glyphosate [N-(phosphonomethyl)glycine], paraquat (1,1′-dimethyl-4,4′-bipyridinium ion), or sodium chlorate:sodium borate (50:50, w/v). Desiccation of plants by paraquat significantly reduced seed weight and germination at all locations and increased the incidence of Alternaria and Phomopsis spp. at Urbana. Analysis of the combined data from the Brazilian locations showed a significant decrease in seed germination for all treatments except paraquat sprayed on the UFV2 at R7 and sodium chlorate: sodium borate sprayed on UFV1 at R7. Herbicide application at R7 did not result in consistent increases in seedborne Fusarium or Phomopsis spp. at any Brazilian location. Rainfall and temperature at seed maturation were more important variables in pod-to-seed infection by these fungi than increased rates of tissue senescence caused by the desiccants.

Type
Research Article
Copyright
Copyright © 1982 by the Weed Science Society of America 

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