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

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 agen...

Full description

Saved in:
Bibliographic Details
Published inJournal of Weed Science and Technology Vol. 68; no. 4; pp. 160 - 163
Main Authors Akazawa, Masahiro, Kato-Noguchi, Hisashi
Format Journal Article
LanguageEnglish
Japanese
Published The Weed Science Society of Japan 2023
Subjects
application dose
application timing
Chinese sprangletop
cyhalofop-butyl
transplanted rice
Online AccessGet full text

Cover

More Information
Summary: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.
ISSN:0372-798X
1882-4757
DOI:10.3719/weed.68.160