由藻菌纲特别是其中的卵菌(Oomycetes)可引起多种作物如葡萄、马铃薯、烟草、番茄、玉米、高粱等等的许多病害。每年用于防治卵菌病害的药剂价值10亿瑞士法郎,占全部杀菌剂市场的三分之一。历来占领这一部分市场的杀菌剂都是广谱性的,具有中等水平的杀菌毒性和单纯的残留性能。它们易被淋洗掉,没有治疗效果,也不能保护作物的新生长部分。 From the phylum Phylum, especially the Oomycetes, can cause many diseases such as grapes, potatoes, tobacco, tomato, corn, sorghum and the like. Each year the agent used to control Oomycetes is worth 1 billion Swiss francs, accounting for one-third of the total fungicide market. Bactericides that historically occupy this part of the market are broad spectrum, have moderate levels of bactericidal toxicity and simple residual properties. They are easily rinsed, have no therapeutic effect, and do not protect the new growth of the crop.