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Effect of Thifensulfuron Concentration and Droplet Size on Phytotoxicity, Absorption, and Translocation in Pea (Pisum sativum)

Published online by Cambridge University Press:  12 June 2017

Kassim Al-Khatib ,
David R. Gealy  and
Chris M. Boerboom
Kassim Al-Khatib
Affiliation:
Northwest Res. and Ext. Unit, Washington State Univ., Mt. Vernon, WA 98273
David R. Gealy
Affiliation:
USDA-ARS, Pullman, WA 99164
Chris M. Boerboom
Affiliation:
Dep. Crop and Soil Sci., Washington State Univ., Pullman, WA 99164
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Abstract

Greenhouse experiments were conducted to evaluate phytotoxicity, absorption, and translocation of thifensulfuron when applied to pea at different rates, droplet sizes, and as dry particles. Thifensulfuron rates that reduced shoot dry weight by 25% were 0.46, 0.59, 0.98, and 1.21 g ai ha-1 for droplet diameters of 110, 155, 300, and 450 μm, respectively. The 14C-thifensulfuron absorption as percent of applied increased twofold, whereas translocation decreased 36% as herbicide concentration increased from 18 to 146 mg L-1 in 980-μm droplets. Small droplets (50 μm) that dried to particles before contact with leaves did not damage pea plants. However, under dew conditions, dry particles damaged peas to a similar degree as liquid droplets. We concluded that small and concentrated droplets of thifensulfuron can damage peas more than large and diluted droplets as a result of increased herbicide absorption.

Keywords

Thifensulfuron, 3-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-amino]carbonyl]amino]sulfonyl]-2-thiophenecarboxylic acidpea, Pisum sativum L. ‘Columbia.’Droplet concentrationherbicide drift
Type
Special Topics
Information
Weed Science , Volume 42 , Issue 3 , September 1994 , pp. 482 - 486
Copyright
Copyright © 1994 by the Weed Science Society of America 

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