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Influence of Organosilicone Surfactants and Spray Nozzle Types on the Fate and Efficacy of Clopyralid on Honey Mesquite (Prosopis glandulosa)

Published online by Cambridge University Press:  12 June 2017

Rodney W. Bovey ,
Eric Franz  and
Steven G. Whisenant
Rodney W. Bovey
Affiliation:
Dep. Rangeland Ecol. & Mgmt., Texas A&M Univ., College Station, Headquarters: Weed Sci. Lab., Beltsville, MD
Eric Franz
Affiliation:
Dep. Rangeland Ecol. & Mgmt., Texas A&M Univ., College Station, Headquarters: Weed Sci. Lab., Beltsville, MD
Steven G. Whisenant
Affiliation:
Dep. Rangeland Ecol. & Mgmt., Texas A&M Univ., College Station, Headquarters: Weed Sci. Lab., Beltsville, MD
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Abstract

Greenhouse and laboratory experiments were conducted to evaluate the influence of two organosilicone surfactants and spray nozzle types on the spray deposition, absorption, translocation, and efficacy of the monoethanolamine salt of clopyralid on honey mesquite. Sylgard 309 or Silwet L-77 added to the spray solution at 0.1, 025 and 0.5% by vol did not increase spray deposition, absorption, translocation, or phytotoxicity of clopyralid applied at 140 g ae ha-1 on honey mesquite compared to no surfactant An air-assist spray nozzle at 9.4 L ha-1 by vol resulted in greater initial clopyralid deposit on honey mesquite than hydraulic nozzles at 9.4 or 187 L ha-1 by vol, but air-assist application did not increase phytotoxicity compared to hydraulic nozzles.

Keywords

Clopyralid, 3,6-dichloro-2-pyridinecarboxylic acidSilwet L-77, polyalkyleneoxide modified polymethyl-siloxane copolymersSylgard 309,2-(3-hydroxypropyl)-heptamethyltrisiloxane, ethoxylated, acetate EO glycol, -allyl, -acetatehoney mesquite, Prosopis glandulosa Torr.3 PRCJGSpray depositionabsorptiontranslocationspray droplet sizeapplication rateair-assist nozzlehydraulic nozzlelow volumeultralow volume
Type
Special Topics
Information
Weed Science , Volume 42 , Issue 4 , December 1994 , pp. 658 - 664
Copyright
Copyright © 1994 by the Weed Science Society of America 

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References

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