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Risks and Reliability of Using Herbicides at Below-Labeled Rates

Published online by Cambridge University Press:  20 January 2017

Jianhua Zhang ,
Susan E. Weaver  and
Allan S. Hamill
Jianhua Zhang*
Affiliation:
Research Center, Agriculture and Agri-Food Canada, Harrow, Ontario, Canada N0R 1G0
Susan E. Weaver
Affiliation:
Research Center, Agriculture and Agri-Food Canada, Harrow, Ontario, Canada N0R 1G0
Allan S. Hamill
Affiliation:
Research Center, Agriculture and Agri-Food Canada, Harrow, Ontario, Canada N0R 1G0
*
Corresponding author's E-mail: zhang117@tc.umn.edu.
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Abstract

The objectives of this study were to determine the efficacy and risk of controlling weeds at reduced herbicide rates under various environmental and biotic conditions, through analysis of published data on the use of below-labeled rates of herbicides. A database was established by extracting information from previously published papers on weed control at below-labeled rates of herbicides in crop production systems over large geographical and temporal scales. The database was then analyzed to evaluate the efficacy and risk of using herbicides at various reduced rates under different management systems. Using below-labeled herbicide rates in conjunction with interrow cultivation is an effective way of reducing herbicide input in agricultural systems while maintaining satisfactory weed control. There are greater opportunities for herbicide reduction using preemergence (PRE) than preplant incorporated (PPI) or postemergence (POST) herbicides, in coarse-textured than in fine-textured soils, and in corn than in soybean or wheat. The success of reducing herbicide rates does not depend on whether the herbicides are applied in conventional or conservation tillage systems or whether they are used with or without adjuvants. The above conclusions are based on studies conducted in experimental fields where weed pressures may be subjectively chosen to be high. Greater potential for herbicide reduction may exist at locations or in cropping systems were weed pressure is low.

Keywords

Corn, Zea mays L.soybean, Glycine max (L.) Merrwheat, Triticum aestivum LDatabaseherbicidesreduced ratesweed control efficacyPOST, postemergencePPI, preplant incorporatedPRE, preemergence
Type
Research
Information
Weed Technology , Volume 14 , Issue 1 , March 2000 , pp. 106 - 115
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Current address: Department of Agronomy and Plant Genetics, University of Minnesota, St. Paul, MN 55108.

References

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