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Oxadiazon Absorption, Translocation, and Metabolism in Rice (Oryza sativa) and Barnyardgrass (Echinochloa crus-galli)

Published online by Cambridge University Press:  12 June 2017

Nagi Reddy Achhireddy ,
Ralph C. Kirkwood  and
William W. Fletcher
Nagi Reddy Achhireddy
Affiliation:
Univ. of Strathclyde
Ralph C. Kirkwood
Affiliation:
Dep. Biol., Univ. of Strathclyde, Glasgow, Scotland
William W. Fletcher
Affiliation:
Dep. Biol., Univ. of Strathclyde, Glasgow, Scotland
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Abstract

The mode of action and selectivity of oxadiazon [2-tert-butyl-4(2,4-dichloro-5-isopropoxyphenyl)-δ2-1,3,4-oxadiazolin-5-one] were investigated in tolerant rice (Oryza sativa L.) and susceptible barnyardgrass [Echinochloa crus-galli (L.) Beauv. ♯3 ECHCG]. Oxadiazon produced only brown spots on the foliage of rice plants at higher rates (> 500 ppmv), while LC50 for barnyardgrass was 250 ppmv. Translocation of 14C-oxadiazon from the treated leaf was minimal in both species; after 7 days, about 2 and 3% of applied 14 C translocated in rice and barnyardgrass, respectively. In rice, 14C recovered in water and chloroform washings of the treated leaf was 25% in each and in barnyardgrass, 20 and 18%, respectively. After water and chloroform washings, 14C-oxadiazon present in the treated leaf of barnyardgrass and rice was 36 and 26%, respectively. In rice and barnyardgrass, unaltered 14C-oxadiazon represented 86 and 79% of applied 14C, respectively, 7 days after application. In barnyardgrass 7 days after foliar application, oxadiazon inhibited 14CO2 fixation and the export of fixed carbon. The effects were less marked in rice.

Keywords

ECHCG
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 32 , Issue 6 , November 1984 , pp. 727 - 731
Copyright
Copyright © 1984 by the Weed Science Society of America 

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