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Weed seed production and seedling emergence responses to late-season glyphosate applications

Published online by Cambridge University Press:  20 January 2017

Patrick A. Clay  and
James L. Griffin
Patrick A. Clay
Affiliation:
Department of Plant Pathology and Crop Physiology, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, 302 Life Sciences Building, Baton Rouge, LA 70803
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Abstract

Seed production and seedling emergence of three broadleaf weed species were evaluated following glyphosate application at initial seed set, mid seed fill, and physiological maturity. In greenhouse experiments averaged across glyphosate rates of 0.42, 0.63, and 0.84 kg ae ha−1, Xanthium strumarium 100-bur weight and burs per plant were reduced at least 69 and 70%, respectively, for application at initial fruit set compared with later applications, and seedling emergence was 3% of the nontreated check. Glyphosate application at initial seed set reduced Sesbania exaltata 100-seed weight 73%, seed per plant 86%, and seedling emergence 94%. Senna obtusifolia 100-seed weight, seed per plant, and seedling emergence were reduced 46, 83, and 66%, respectively, when glyphosate was applied at initial seed set. In field experiments, X. strumarium and S. exaltata seed production were reduced only when glyphosate was applied at initial seed set. Compared with the nontreated check, seedling emergence following initial seed set application was reduced 82% for X. strumarium and 94% for S. exaltata. S. obtusifolia response in the field was inconsistent with no reductions in seed per plant or seedling emergence observed the first year. The second year, initial seed set application reduced seed per plant 88% and seedling emergence 72%.

Keywords

GlyphosateXanthium strumarium L. XANST, common cockleburSesbania exaltata (Raf.) Rybd. ex A. W. Hill SEBEX, hemp sesbaniaSenna obtusifolia L. CASOB, sicklepodSeed per plant100-seed weightweed seedling emergenceweed seed germinationpreharvest herbicide applicationCASOBSEBEXXANST
Type
Research Article
Information
Weed Science , Volume 48 , Issue 4 , August 2000 , pp. 481 - 486
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: University of Arizona Cooperative Extension, Maricopa County, 4341 E. Broadway Rd., Phoenix, AZ 85040-8807

References

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