OCCURRENCE OF WEEDS IN WET-SEEDED RICE FIELDS AND APPLICATION OF NOMINEE (BISPYRIBAC-SODIUM) IN ZHEJIANNG, CHINA
文献类型： 会议论文
第一作者： Q. Wang
作者： Q. Wang 1 ; X. P. Zhao; C. X. Wu; F. Dai; L. Q. Wu; H. Xu; M. S. Li; J. H. He;
作者机构： 1.Institute of Plant Protection, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
关键词： application technique;nominee (bispyribac-sodium);phytotoxicity;water management;weed;wet-seeded rice
会议名称： The 18th Asian-Pacific Weed Science Society Conference v.1
主办单位：
页码： 251-257
摘要： A comprehensive survey was made on weeds and application techniques of Nominee (bispyribac-sodium) were studied for weed control in fields of wet-seeded rice (FWSR) in Zhejiang, China in 1996-2000. Based on weed frequency, density and damage to rice, there appear 15 species of dominant weeds, and Echinochloa crusgalli is most important. Weed species and their proportions composing weed communities differ on areas and culture systems. Weeds occur and damage to rice much more seriously in FWSR than in transplanted rice fields. Weeds germinate 3-4 days after rice seeded (DARS), reach an emergence peak 15-21 DARS for early rice or 7 DARS for single season rice, and there is a small second emergence peak 42-70 DARS. Gramineae weeds germinate first, then most broad-leaf weeds emerge, and lastly sedge and some broad-leaf weeds germinate. Field trials show Nominee sprayed at 15-45 g/ha during 4-5 leaf-stage of barnyardgrass is highly effective on weeds including E. crusgalli after 2 leaf-stage and perennial weeds, but not on Leptochloa chinensis. For control of L. chinensis, field trials show Sofit (pretilachlor+fenclorim), Saturn (thiobencarb), MY100 (oxaziclomefone), YRC2388 (fentrazmide), Clincher (cyhalofop), Whip (fenoxaprop-p-ethyl) are effective. The weed can also be effectively controlled by water management. Sprayed with Nominee, Japonica rice shows plant dwarf and leaf yellow 4-10 days after spraying, recovers 10-20 days after without loss of rice yields, while Indica rice and hybrid rice are tolerant to the chemical. Phytotoxicity of Nominee to Japonica rice is affected by rice variety, leaf stage, herbicide dosage, soil, water management, temperature and safener. By in vivo biochemical test, acetolactate synthase (ALS) is prevented by Nominee and then recovers quickly in rice, while in barnyardgrass inhibition of ALS by Nominee is never recovered. It seems in residue assay that Nominee degrades a little faster in rice than in weed.
分类号： S3
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