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Effect of Organosilicone Surfactants on the Rainfastness of Primisulfuron in Velvetleaf (Abutilon theophrasti)

Published online by Cambridge University Press:  12 June 2017

Jinxia Sun ,
Chester L. Foy  and
Harold L. Witt
Jinxia Sun
Affiliation:
Dep. Plant Pathol., Physiol. and Weed Sci., Virginia Polytech. Inst. and State Univ., Blacksburg, VA 24061
Chester L. Foy
Affiliation:
Dep. Plant Pathol., Physiol. and Weed Sci., Virginia Polytech. Inst. and State Univ., Blacksburg, VA 24061
Harold L. Witt
Affiliation:
Dep. Plant Pathol., Physiol. and Weed Sci., Virginia Polytech. Inst. and State Univ., Blacksburg, VA 24061
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Abstract

Greenhouse experiments were conducted to evaluate the influence of three organosilicone surfactants (Silwet L-77®, Silwet® 408, and Sylgard® 309) and two blends of organosilicone surfactants with conventional adjuvants (Dyne-Amic® and Kinetic®) on the rainfastness of primisulfuron in velvetleaf. Four conventional adjuvants, Rigo Oil Concentrate, Agri-Dex®, methylated soybean oil, and X-77® were selected for comparison. Primisulfuron at 40 g ai/ha was applied alone or with the organosilicones, blends, or X-77 at 0.25% (v/v); the other adjuvants were tested at 1% (v/v). Simulated rainfall (1.25 cm/0.5 h) was applied at 0.25, 0.5, 1, or 2 h after treatment. Control ratings were made at 5-d intervals and shoot fresh weights were recorded 20 DAT. The organosilicone surfactants significantly increased the rainfastness of primisulfuron, even when simulated rainfall was applied at 0.25 or 0.5 h after treatment. Rigo Oil Concentrate and Kinetic also increased rainfastness when rainfall was applied 1 h after treatment. Differences among adjuvants were not as apparent when rainfall was applied 2 h after treatment. Regardless of the timing of simulated rainfall after treatment, there were significant differences between treatments and nontreated check; however, control was not acceptable in several instances.

Keywords

Primisulfuron, 2-[[[[[4,6-bis(difluoromethoxy)-2-pyrimidinyl]amino]carbonyl]-amino]sulfonyl]benzoic acidvelvetleaf, Abutilon theophrasti Medicus # ABUTHConventional adjuvantssimulated rainfallABUTH
Type
Research
Information
Weed Technology , Volume 10 , Issue 2 , June 1996 , pp. 263 - 267
Copyright
Copyright © 1996 by the Weed Science Society of America 

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