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Phytotoxic Effects of Glyphosate on Pepper (Capsicum annuum)

Published online by Cambridge University Press:  20 January 2017

James P. Gilreath ,
Carlene A. Chase  and
Salvadore J. Locascio
James P. Gilreath*
Affiliation:
Gulf Coast Research and Education Center, 5007 60th Street E., University of Florida, Bradenton, FL 34203-9324
Carlene A. Chase
Affiliation:
Horticultural Sciences Department, P.O. Box 110690, University of Florida, Gainesville, FL 32611-0690
Salvadore J. Locascio
Affiliation:
Horticultural Sciences Department, P.O. Box 110690, University of Florida, Gainesville, FL 32611-0690
*
Corresponding author's E-mail: [email protected].
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Abstract

Glyphosate was applied to pepper as single or sequential applications to assess the consequences of drift or other accidental exposures. Foliar injury increased and plant vigor declined with increased rates of glyphosate and were exacerbated by a second application. Single applications at flowering (stage 1) were more damaging than single applications after fruit set (stage 2). Decline in marketable yield with increased glyphosate rate was greater with stage 1 applications, except in spring 1987 when marketable yields with single applications of glyphosate at stage 1 or stage 2 were statistically similar. Sequential applications resulted in the lowest marketable yields. Total yields declined with increased glyphosate rate and decline was more pronounced with sequential applications than with single applications. Total yield was affected to a greater extent when glyphosate was applied at stage 1 than at stage 2. Yield was more sensitive to two successive exposures than to single applications. Mean fruit weight was reduced by glyphosate in two of the four experiments.

Keywords

Glyphosatepepper, Capsicum annuum L.Simulated driftherbicide injuryDAT, days after treatmentWAT, weeks after treatment
Type
Research Article
Information
Weed Technology , Volume 14 , Issue 3 , September 2000 , pp. 488 - 494
Copyright
Copyright © Weed Science Society of America 

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