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Selectivity Mechanisms for Foliar Applications of Diclofop-Methyl. I. Retention, Absorption, Translocation, and Volatility

Published online by Cambridge University Press:  12 June 2017

P. F. Boldt  and
A. R. Putnam
P. F. Boldt
Affiliation:
Pestic. Res. Ctr., Dep. Hortic., Michigan State Univ., East Lansing, MI 48824
A. R. Putnam
Affiliation:
Pestic. Res. Ctr., Dep. Hortic., Michigan State Univ., East Lansing, MI 48824
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Abstract

Retention, absorption, translocation, and volatility of foliarly applied diclofop-methyl {methyl 2-[4-(2,4-dichlorophenoxy) phenoxy] propanoate} were compared in barnyardgrass [Echinochloa crus-galli (L.) Beauv.], a susceptible grass; proso millet (Panicum miliaceum L.), a moderately susceptible grass; longspine sandbur [Cenchrus longispinus (Hack.) Fern.], a tolerant grass; and soybean [Glycine max (L.) Merr. ‘Hark’] and cucumber (Cucumis sativus L. ‘Green Star’), both tolerant broadleaf plants. On a jug/plant basis, the order of diclofop-methyl spray retention was cucumber > soybean > proso millet > longspine sandbur = barnyardgrass. On a μg/mg dry weight basis, proso millet retained 3 to 10 times more diclofop-methyl than all other species. One day after treatment (DAT), absorption of 14C-diclofopmethyl was 14 to 18% less in longspine sandbur than in the other species, 3 DAT absorption in cucumber was 8 to 14% greater than in the other species, and 5 DAT absorption in soybean was 3 to 12% less than in other species. Translocation of 14C-diclofop-methyl did not differ among species, with 98% of the applied radioactivity located in the treated leaf. An average of 11% of radioactivity applied to the surface of intact, living plants and excised, dried leaves of cucumber, soybean, and barnyardgrass, as well as glass cover slips, was lost by evaporation. None of the parameters measured showed differences large enough to be implicated as primary selectivity mechanisms.

Keywords

Diclofoppenetrationuptake
Type
Research Article
Information
Weed Science , Volume 28 , Issue 5 , September 1980 , pp. 474 - 477
Copyright
Copyright © Weed Science Society of America 

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