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在网室稻株上试验表明,水稻白叶枯菌对叶枯宁和敌枯双都易产生抗药性。250ppm施一次后,病叶中遗留(?)的抗药性都上升了,病菌抗性上升到5倍以上的病叶占3/10;施二次药后,病斑中的遗留菌基本上都是抗性菌,与原始敏感菌相比,其EC_(50)至少上升了11倍,能抗16000ppm的叶枯宁,叶枯宁用于保护时产生抗性的机率要比治疗时少。这种抗性现象可解释叶枯宁使用时间及次数的药效差异现象,也可为正确使用叶枯宁提供理论依据。
Experiments on paddy rice plants showed that R. solanacearum was resistant to both phyllodon and dwarf both. After the application of 250ppm, the resistance of leftovers (?) In the diseased leaves increased, and the disease resistance increased to more than 5 times of the diseased leaves accounted for 3/10; after the second drug, the remaining bacteria in the lesion basically Is a resistant bacterium. Compared with the original sensitive bacterium, its EC50 (50) increased at least 11 times. It is able to resist phytanide at 16000 ppm. This resistance phenomenon can explain the difference in the efficacy and the times of leaf koningun, and also provide a theoretical basis for the correct use of leaf koningin.