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通过5种杀菌剂防治单季稻白叶枯病的田间试验表明,初病期施药1次,以667 m2施用20%噻唑锌悬浮剂100 m L、20%叶枯唑可湿性粉剂100 g、20%噻森铜悬浮剂100 m L的防效较好,病指防效分别为31.4%~39.2%,15.8%~21.7%和12.5%~36.5%;药后14 d,以667 m2施用20%噻菌铜悬浮剂100 m L、20%叶枯唑可湿性粉剂100 g、20%噻唑锌悬浮剂100 m L的防效较好,病指防效分别为18.3%,13.8%~26.7%和10.5%~14.0%。在伤口期、初病期和激增期每667 m2各喷施1次20%噻菌铜悬浮剂100 m L,则以伤口期病菌接触前施药1次效果最佳,药后7 d病指防效达90.4%;药后21 d,2次较单次用药的病指防效提高19.9%。初病期防治白叶枯病,每667 m2喷施20%噻唑锌悬浮剂100 m L、20%噻菌铜悬浮剂100 m L、20%叶枯唑可湿性粉剂100 g、20%噻森铜悬浮剂100 m L各1次,对单季稻均有较好的保产效果,分别为23.9%~29.9%,21.0%,20.1%~22.3%,15.9%~18.0%。667 m2施用20%噻菌铜100 m L,以在伤口期病菌接触前施药1次的保产效果最佳,达28.8%;其次在初病期施药1次,保产效果为21.0%;而在伤口期病菌接触前+激增期、初病期+激增期用药2次的保产效果均比单用1次增效明显。
Five fungicides to control single crop rice bacterial blight field trials showed that the initial disease period of application 1, 667 m2 application of 20% thiazole zinc suspension 100 m L, 20% of the leaf blight wettable powder 100 g, 20 The control efficacy of 100% sodium thiozole SC was better than that of the control. The control efficacy was 31.4% -39.2%, 15.8% -21.7% and 12.5% -36.5%, respectively. At 14 days after treatment, 66% The control effect of thiabendazole copper suspension 100 m L, 20% leaf mofetil wettable powder 100 g and 20% thiazole zinc suspension 100 m L were better, the pathological control efficacy was 18.3%, 13.8% -26.7% and 10.5% ~ 14.0%. In wounding, initial disease period and surge period of 667 m2 each spraying a 20% thiabendazole copper suspension 100 m L, the wound pathogen inoculation before 1 times the best, the medicine after 7 d The control efficacy reached 90.4%. After 21 d, the anti-efficacy of the two treatments was 19.9% higher than that of the single treatment. The first stage of the prevention and control of bacterial blight, spraying 66% per square meter of 20% thiazole zinc suspension 100 m L, 20% thiabendazole suspension 100 m L, 20% leaf blight wettable powder 100 g, 20% Copper suspending agent 100 m L each 1 times, the single cropping rice have better long-term effect, respectively, 23.9% to 29.9%, 21.0%, 20.1% -22.3%, 15.9% to 18.0%. 667 m2 application of 20% thiabendazole 100 m L, in order to pre-exposure to wound bacteria in contact with the best one, the best yield of 28.8%; followed by the initial period of application 1, the yield of 21.0% ; While in the period of pre-exposure and exacerbation of wound-opening germs, the first-stage and exacerbation phases of the second-line administration were both more effective than single-use alone.