【摘要】 针对"123种植模式"中一季中晚稻的生育时段主要在5~9月,抽穗扬花期常遇中温、高湿尤其雨天较多,稻曲病发生较严重。2013年以黄华占和金农丝苗为试验材料,在广州市花都区会兴菜场以药剂(三唑酮、爱苗、井冈霉素)为主处理、以喷施时期(破口前7 d、破口前7 d+破口期、破口期)为副处理进行一季中晚稻稻曲病的药效试验和防治适期的研究。结果表明:3种药剂三唑酮、爱苗、井冈霉素对稻曲病病穗率和病情指数均具有极显著降低,但3种药剂间差异不显著,其中爱苗的防治效果较好;喷施时期对稻曲病病穗率和病情指数的影响没达显著水平,但破口前7 d+破口期喷施的防治效果较好;3种药剂三唑酮、爱苗、井冈霉素处理后增产显著,其中爱苗的增幅较大,增产的主要原因是结实率显著提高从而显著增多每穗实粒数;喷施时期对产量虽有影响,但差异不显著。更多还原

【Abstract】 The paper was to study optimum chemical agents and control periods against rice false smut(Ustilaginoidea virens) in single cropping middle-late rice. Taking chemical agents(triadimefon, armure, jinggangmycin) as main treatments and spraying periods(within 7 d before initial heading stage, within 7 d before initial heading stage + initial heading stage,initial heading stage) as assisted treatments, the field efficacy trial and optimum control period of U. virens in single cropping middle-late rice were studied using Huanghuazhan and Jinnongsimiao as experimental materials in 2013. Three chemical agents, triadimefon, armure, jinggangmycin, extremely reduced diseased panicle rate and disease index of U.virens, but there was no significant difference among three chemical agents. Spraying period did not have significant impact on diseased panicle rate and disease index of U. virens, whereas spraying within 7 d before initial heading stage and during initial heading stage had relatively good control effect. Yield increased significantly after application of three chemical agents, and armure led to greater increase. The reason for yield increase was that seed setting rate significantly increased,and the number of filled grains per panicle significantly increased. Although spraying period influenced yield, the difference was not significant.更多还原