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Preemergence Herbicidal Activities of 3-Phenoxypyridazine Derivatives

Published online by Cambridge University Press:  12 June 2017

Tetsuo Takematsu ,
Yasutomo Takeuchi  and
Saburo Tamura
Tetsuo Takematsu
Affiliation:
Weed Control Res. Inst., Utsunomiya University, Utsunomiya-shi, Japan
Yasutomo Takeuchi
Affiliation:
Weed Control Res. Inst., Utsunomiya University, Utsunomiya-shi, Japan
Saburo Tamura
Affiliation:
Dep. of Agr. Chem., The University of Tokyo, Tokyo, Japan
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Abstract

Preemergence herbicidal activities of 27 3-phenoxypyridazine derivatives were evaluated in pots under upland and submerged conditions. Each of the compounds containing an alkyl or halogen at the ortho position of the benzene ring showed marked herbicidal effects. The activity of some disubstituted compounds carrying one of the substituents at the ortho position was the next. Among the compounds tested, 3-(2-methylphenoxy)-, 3-(2,3-dimethylphenoxy)-, 3-(2,4-dimethylphenoxy)-, and 3-(2,6-dimethylphenoxy)-pyridazines exhibited an excellent margin of selectivity for tomato (Lycopersicum esculentum Mill.), cotton (Gossypium hirsutum L.), soybean (Glycine max (L.) Merr.), and Azuki bean (Phaseolus angularis Wight). For transplanted rice (Oryza sativa L. ‘Norin No. 29′) under submerged conditions, 3-(2-isopropylphenoxy)-and 3-(2-n-butylphenoxy)-pyridazines showed a remarkable margin of selectivity, though the herbicidal activity of both compounds was slightly inferior to that of 3-(2-methylphenoxy)-pyridazine.

Type
Research Article
Information
Weed Science , Volume 20 , Issue 4 , July 1972 , pp. 327 - 329
Copyright
Copyright © Weed Science Society of America 

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References

Literature Cited

1. Jojima, T., Oyamada, K. and Tamura, S. 1968. Syntheses of pyridazine derivatives as herbicides. Part III. Preparation of 3- and 4-phenoxypyridazines. Agr. Biol. Chem. 32:1376–1381.Google Scholar
2. Jojima, T., Yoshimura, N., Takematsu, T. and Tamura, S. 1969. Herbicidal activity of some pyridazine derivatives. Part III. 3-Phenoxypyridazines and related compounds. Agr. Biol. Chem. 33:96–102.Google Scholar
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