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Phenoxy Acid Herbicides for Barnyardgrass Control in Transplanted Rice

Published online by Cambridge University Press:  12 June 2017

S. K. De Datta ,
R. Q. Lacsina  and
D. E. Seaman
S. K. De Datta
Affiliation:
The International Rice Research Institute, Los Baños, Laguna (mail address: IRRI, P. O. Box 583, Manila), Philippines
R. Q. Lacsina
Affiliation:
The International Rice Research Institute, Los Baños, Laguna (mail address: IRRI, P. O. Box 583, Manila), Philippines
D. E. Seaman
Affiliation:
The International Rice Research Institute, Los Baños, Laguna (mail address: IRRI, P. O. Box 583, Manila), Philippines
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Abstract

In experiments conducted at the International Rice Research Institute, Philippines, all commonly marketed formulations and derivatives of either [(4-chloro-o-tolyl)oxy]acetic acid (MCPA) or (2,4-dichlorophenoxy) acetic acid (2,4,D) performed in about the same way and were equally safe for use in controlling barnyardgrass [Echinochloa crusgalli (L.) Beauv.] and other annual weeds in transplanted rice (Oryza sativa L.). Eleven-day-old rice seedlings were more susceptible to amine salts of 2,4-D or MCPA than 21-day-old seedlings. Granular formulations of some chemicals were relatively less toxic than liquid formulations. The toxic effect of spraying the potassium salt of MCPA was less prolonged on the indica variety, IR22, than it was on the japonica variety, Chianung 242, which had delayed flowering and maturity.

Type
Research Article
Information
Weed Science , Volume 19 , Issue 3 , May 1971 , pp. 203 - 206
Copyright
Copyright © Weed Science Society of America 

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References

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