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Selectivity of Pyriclor on Witchweed, Tobacco, and Other Plants

Published online by Cambridge University Press:  12 June 2017

Jim E. Dale
Jim E. Dale*
Affiliation:
U. S. Dep. of Agr., Witchweed Laboratory, Whiteville, North Carolina
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Abstract

Postemergence directed application of 0.56 kg/ha of 2,3,5-trichloro-4-pyridinol (pyriclor) gave control of witchweed (Striga lutea Lour.) equivalent to 2.24 kg/ha of (2,4-dichlorophenoxy)acetic acid (2,4-D) without injuring corn (Zea mays L.). Pyriclor applied to the soil surface or incorporated did not significantly injure tobacco (Nicotiana tabacum L.) at rates of 2.24 kg/ha and less. Peanut (Arachis hypogaea L.) was not injured by pyriclor incorporated in soil at 0.56 kg/ha; Irish potato (Solanum tuberosum L.) was slightly injured. Treatment with 0.56 kg/ha of pyriclor applied in the same manner killed six crop species and four weed species also included in the experiment. In 2 years of field experiments, application of pyriclor at 0.21 and 0.63 kg/ha to soil before transplanting, or these rates applied over the top of tobacco after transplanting, controlled large crabgrass (Digitaria sanguinalis L. Scop.) until maturity of the tobacco, and did not significantly reduce yield or cause permanent injury to the crop.

Type
Research Article
Information
Weed Science , Volume 19 , Issue 1 , January 1971 , pp. 90 - 93
Copyright
Copyright © Weed Science Society of America 

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References

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