关键词: 单季直播, 稻田, 稗草（Echinochloa crusgalli （L.） Beauv）, 抗药性, 控草策略, 鄱阳湖平原

Abstract: A demonstration experiment on control of resistant weeds by stem and leaf spraying was carried out in direct-seeding rice fields at 3-leaf stage using 13% cyhalofop-butyl. benzyl EC and heir combinations. The results showed that the combined application of 13% cyhalofop-butyl. benzyl EC 80 mL/667 m²+10% cyhalofop-butyl EC 100~150 mL/667 m² had ideal control effect on the resistance of Echinochloa crusgalli （L.） Beauv., Leptochloa chinensis （L.） Nees and other weeds in direct seeding rice fields; The control effect spraying with 10% metamifop EC 160 mL/667m² is ideal for resistant Echinochloa crusgalli （L.） Beauv., Leptochloa chinensis （L.） Nees in direct seeding rice field; The control effect spraying with 10% metamifop. cyhalofop-butyl EC 170~200 mL/667 m² is not very ideal for resistant Echinochloa crusgalli （L.） Beauv., Leptochloa chinensis （L.） Nees, broad-leaved weeds, such as Monochoria vaginalis （Burm. f.）, and Cyperaceae weeds such as Cyperus difformis L. On the 13th day after spraying herbicides, the plant control effect of each treatment on barnyard grass was 96.8%~98.8%, and 85.0%~98.0% on total grass. On the 30th day after spraying herbicides, the control effect of each agent on the plant and fresh weight of barnyard grass was 97.2%~99.0%, 95.4%~99.5%, 94.1%~98.1% and 94.6%~99.2%, but the residual barnyard grass could still cause harm in the field. The control strategy of resistant barnyard grass was put forward.

Key words: one-season direct seeding, rice field, Echinochloa crusgalli （L.） Beauv, pesticide resistance, weed control strategy, Poyang Lake Plain