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Control of coca plants (Erythroxylum coca and E. novogranatense) with glyphosate

Published online by Cambridge University Press:  12 June 2017

Jorge F. S. Ferreira ,
Reid J. Smeda  and
Stephen O. Duke
Reid J. Smeda
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service, Southern Weed Science Laboratory, Stoneville, MS 38776-0350
Stephen O. Duke
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service, Southern Weed Science Laboratory, Stoneville, MS 38776-0350
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Abstract

Glyphosate applied at rates of 0, 0.3, 0.6, 1.1, 2.2, 3.4, 4.5, 6.7, 9.0, and 13.4 kg ai ha−1 was evaluated for the control of greenhouse-grown Erythroxylum novogranatense var. novogranatense and E. coca var. coca plants. Glyphosate reduced live weight of both species, 6 wk after treatment, at rates as low as 0.6 kg ha−1, but was more effective in reducing live weight and regrowth on E. novogranatense than E. coca. Glyphosate at 1.1 kg ha−1 killed 100% of E. novogranatense plants 5 mo after treatment. Glyphosate rates of 2.2 kg ha−1 and higher reduced regrowth of E. coca plants 65 to 100%, independent of leaf age at time of spraying. Control of regrowth persisted for over 17 mo after treatment, with 37% of E. coca plants dying at rates of 13.4 kg ha−1 between 6 mo and 1 yr after treatment. Glyphosate, applied up to 6.7 kg ha−1, had no significant effect on regrowth of E. coca when plants were defoliated 24 h before treatment. Glyphosate at 2.2 kg ha−1 effectively killed E. novogranatense plants and reduced leaf production of E. coca plants.

Keywords

Glyphosate, N-(phosphonomethyl)glycinecoca, Erythroxylum coca var. coca Lam. and E. novogranatense var. novogranatense (Morris) HieronErythroxylaceaeillicit cropsnarcotic plants
Type
Weed Management
Information
Weed Science , Volume 45 , Issue 4 , August 1997 , pp. 551 - 556
Copyright
Copyright © 1997 by the Weed Science Society of America 

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