Journal of Weed Science and Technology
Online ISSN : 1882-4757
Print ISSN : 0372-798X
ISSN-L : 0372-798X
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Displaying 1-4 of 4 articles from this issue
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Short Reports
  • Weeding system of field margins to prevent invasion upon soybean fields and seed dispersal of Ipomoea hederacea Jacq. var. integriuscula A.Gray in northern Kanto
    Nozomi Ihara, Fubuki Hoshi, Yuki Ogiso, Hiroyuki Kobayashi
    2023 Volume 68 Issue 4 Pages 155-159
    Published: 2023
    Released on J-STAGE: March 30, 2024
    DOIhttps://doi.org/10.3719/weed.68.155
    JOURNAL FREE ACCESS
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    Morning glories invade and disperse seeds from soybean field margins to adjacent fields. To verify whether the invasion and seed dispersal of morning glories could be prevented with additional weed management in September to farmer’s conventional management in field margins, entireleaf morningglory (Ipomoea hederacea Jacq. var. integriuscula A.Gray) was sown in experimental field margins adjacent to soybean fields. Two-treatment (June and August) and three-treatment (June, August, and September) with 48% glyphosate potassium salt solution and no-treatment methods were employed. The aboveground dry weight of the treated morning glory, invasion distance into the soybean field, and estimated number of seeds dispersed in the field were determined. The vines invaded up to the first (0.6 m from the field margins) and fourth (2.4 m) rows of the soybean fields under two-treatment and no-treatment, respectively, and seeds were dispersed under both treatments. Vines invaded up to the first row, but no seed was dispersed under three-treatment method.

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  • Effect of delayed application of cyhalofop-butyl on the removal of Chinese sprangletop (Leptochloa chinensis (L.) Nees) in rice paddy fields in the southern part of the Okayama Prefecture
    Masahiro Akazawa, Hisashi Kato-Noguchi
    2023 Volume 68 Issue 4 Pages 160-163
    Published: 2023
    Released on J-STAGE: March 30, 2024
    DOIhttps://doi.org/10.3719/weed.68.160
    JOURNAL FREE ACCESS
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    We investigated the effect of dose and timing of application of a cyhalofop-butyl emulsion (CB agent) on the growth of Chinese sprangletop (Leptochloa chinensis (L.) Nees), a weed species that invades rice paddy fields by spreading through its stolons. The application of 300–900 g a.i./ha of CB agent before heading showed an increase in efficacy with increasing dosage. At 900 g a.i./ha application, a significant suppression was observed in the growth and panicle booting of this species. The weed height and number of panicles reduced from 14% to 28% and 0% to 1%, respectively, 55–63 days after treatment when compared to the untreated control. The effect of the same chemical dose varied with the time of treatment. The pre-emergence treatment was found to be the most effective in suppressing panicle emergence. In contrast, the effect of treatment after the beginning of panicle emergence decreased, and the number of panicles in the middle of panicle emergence was about the same as that in the untreated control.

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