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Three applications of 300 - 500 times diluent liquid were done at the proper control period of disease.
在发病初期,使用20%噻森铜悬浮剂300~500倍液,连续用药3次,防效可达约80%.
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The suitable control period should be from preliminary occurence to first stage of increase.
防治适期应该掌握在初发期至种群增长期的初级阶段.
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