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Phytotoxicity and Translocation of Glyphosate in the Potato (Solanum tuberosum) Prior to Tuber Initiation

Published online by Cambridge University Press:  12 June 2017

D. Smid  and
L. K. Hiller
D. Smid
Affiliation:
Dep. Hortic. and Landscape Arch., Washington State Univ., Pullman, WA 99164. Correspondence should be addressed to L. K. H.
L. K. Hiller
Affiliation:
Dep. Hortic. and Landscape Arch., Washington State Univ., Pullman, WA 99164. Correspondence should be addressed to L. K. H.
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Abstract

Field and greenhouse experiments were conducted to observe and measure the phytotoxicity of glyphosate [N-(phosphonomethyl)glycine] to potatoes (Solanum tuberosum L. ‘Russet Burbank’) applied at different stages of growth and to determine if glyphosate was translocated into the original mother tuber (seed piece) prior to initiation of daughter tubers. Glyphosate injury symptoms appeared 1 day after treatment and at least 50% of the foliage was necrotic within 7 days. Significant decreases in plant height, shoot and root dry matter content, and daughter tuber production were recorded at the 0.28- and 0.56-kg/ha rates. Higher rates of 1.12 and 2.24 kg/ha did not give further significant reductions. Maximum levels of 14C activity accumulated in all plant parts 4 days after application of the 14 C-glyphosate. The 14 C-glyphosate accumulated primarily in the apical meristem and roots. Extremely low levels of 14 C activity were detected in the mother tuber regardless of plant age when treated. Phytotoxic effects on the eyes of the mother tuber increased in severity with increasing rates of glyphosate as evidenced by abnormal sprouting.

Keywords

Volunteer potatoesmother tuberpotato seed piecepotato regrowth
Type
Research Article
Information
Weed Science , Volume 29 , Issue 2 , March 1981 , pp. 218 - 223
Copyright
Copyright © Weed Science Society of America 

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