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Factors Influencing Postemergence Activity of Chloramben in Velvetleaf (Abutilon theophrasti)

Published online by Cambridge University Press:  12 June 2017

Wendel B. Orr ,
Chaudhry A. Ozair  and
Loren J. Moshier
Wendel B. Orr
Affiliation:
Dep. Agron., Kansas State Univ., Manhattan, KS 66506
Chaudhry A. Ozair
Affiliation:
Dep. Agron., Kansas State Univ., Manhattan, KS 66506
Loren J. Moshier
Affiliation:
Dep. Agron., Kansas State Univ., Manhattan, KS 66506
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Abstract

Efficacy of soil and/or foliage applications of the sodium salt of chloramben (3-amino-2,5-dichlorobenzoic acid) was compared, and the influence of growth stage and oil base within adjuvants on chloramben efficacy was evaluated on velvetleaf (Abutilon theophrasti Medic. # ABUTH). In greenhouse experiments, soil applications reduced growth of velvetleaf treated at the six- to seven-leaf stage (15-cm height) more than did foliage applications. Simulated rainfall applied 48 h after chloramben was applied to foliage significantly increased chloramben activity. Chloramben plus an oil concentrate applied at 3.4 kg ae/ha plus 2.3 L/ha reduced fresh and dry weight less as growth stage advanced in both greenhouse and field experiments. Origin of oil present in the oil concentrate did not influence the activity of chloramben plus oil concentrate in either the greenhouse or in the field. Chloramben plus oil concentrate reduced seed capsule (boll) production 70% or more in velvetleaf plants treated at each of three growth stages in one year and reduced capsule production 90, 90, and 28% in plants treated at early vegetative, late vegetative, and flowering stages, respectively, in the second year. Viability of seed was less from plants treated at a vegetative stage compared to the flowering stage.

Keywords

Foliage applicationsapplication sitegrowth stageoil concentrateadjuvantsABUTH
Type
Weed Control and Herbicide Technolgy
Information
Weed Science , Volume 35 , Issue 6 , November 1987 , pp. 853 - 857
Copyright
Copyright © 1987 by the Weed Science Society of America 

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References

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