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Glyphosate efficacy, absorption, and translocation in pitted morningglory (Ipomoea lacunosa)

Published online by Cambridge University Press:  20 January 2017

Clifford H. Koger  and
Krishna N. Reddy
Krishna N. Reddy
Affiliation:
USDA–ARS, Southern Weed Science Research Unit, P.O. Box 350, Stoneville, MS 38776
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Abstract

Greenhouse and laboratory studies were conducted to examine the effects of site of plant exposure to glyphosate spray on efficacy, absorption, and translocation in pitted morningglory. Absorption of 14C-glyphosate in four-leaf pitted morningglory gradually increased with time from 19% at 1 h after treatment (HAT) to 44% at 192 HAT. The amount of 14C translocated with time ranged from 0.4% at 1 HAT to 25% at 192 HAT. Vining 1-m tall plants were controlled 75 to 100% when the top-, middle-, bottom one-third, or entire plant was treated with 1.38 or 2.76 kg ha−1 glyphosate, with control affected more by glyphosate rate than plant section exposed to glyphosate spray. Absorption of 14C-glyphosate at 96 HAT was similar whether it was applied to the top-, middle-, bottom one-third, or entire plant of 1-m tall pitted morningglory. The amount of 14C translocated out of the treated area (5 to 6%) did not differ whether it was applied to top-, middle-, or bottom one-third plant section. Results indicate that absorption and translocation of 14C-glyphosate in pitted morningglory was rapid and increased with time. Treating any one-third section of pitted morningglory plants was as effective as entire plant exposure, and control with glyphosate is more affected by rate than the degree of plant exposure to glyphosate.

Keywords

Glyphosatepitted moringglory, Ipomoea lacunosa L. IPOLABiomass reductionglyphosate tolerancespray coverageweed control
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 53 , Issue 3 , June 2005 , pp. 277 - 283
Copyright
Copyright © Weed Science Society of America 

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