Journal of Weed Science and Technology
Online ISSN : 1882-4757
Print ISSN : 0372-798X
ISSN-L : 0372-798X
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Volume 52, Issue 3
Displaying 1-4 of 4 articles from this issue
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Original Reports
  • Occurrence of resistant biotype water foxtail (Alopecurus aequalis) to some herbicides in wheat fields in Fukuoka prefecture, and the control method of its biotype
    Osamu Uchikawa, Masayuki Miyazaki, Kohei Tanaka
    2007 Volume 52 Issue 3 Pages 125-129
    Published: 2007
    Released on J-STAGE: June 21, 2008
    DOIhttps://doi.org/10.3719/weed.52.125
    JOURNAL FREE ACCESS
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    In wheat paddy fields in Fukuoka prefecture which used thifensulfuron-methyl, a herbicide continuously in seven year, water foxtail (Alopecurus aequalis) in which the herbicidal activity was inferior arose As the results, the sensitivity test of the herbicide variously using both biotype seeds, and it was confirmed that the susceptibility lowered for thifensulfuron-methyl and dinitroaniline herbicide. As simple method test of herbicide resistant water foxtail, it was clarified that to use rooting method for sulfonylurea herbicide resistant weeds in summer paddy weeds were possible of this species. The fields which occurred the resistant biotype, it was clarified that the pendimethalin, thiobencarb and linuron mixture is effective.
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  • An awnless variant of Bidens tripartita
    Reiichi Miura, Makoto Hosotani, Misako Ito
    2007 Volume 52 Issue 3 Pages 130-136
    Published: 2007
    Released on J-STAGE: June 21, 2008
    DOIhttps://doi.org/10.3719/weed.52.130
    JOURNAL FREE ACCESS
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    A form of Bidens tripartita that lacks seed awns was found in Tamba Hill, northern Kinki District, Japan. It was found in cropped or abandoned paddy in small basins in the hill, with or separately from normal awned form. Only the normal awned form was found in plains around Tamba Hill. A cultivation exper-iment showed that this is a genetic polymorphism. After simulated rice reaping in an experimental mixed stand of the two forms, many awned but no awnless seeds were found attached on experimenter's clothing. The percentage of the seeds remaining inside the paddy after work was higher in awnless than in awned form.
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