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病害的概念近年来,全日本的紫菜产量大体稳定在80亿张,看起来,往往使人觉得不存在病害问题。但实际上,每年总有某些养殖海区发生一些病害。紫菜受害的特点是,即使对产量不发生影响,也会由于发生病害而使产品质量大大下降,从而对产值影响很大。所以,预防病害非常重要。有一个时期,人们曾尝试过有效药剂的开发研究。但是,在养殖紫菜的浅海海域,高密度地分布着其它水产经济动、植物,从水是生物的媒质这一点来看,药剂对其它生物的影响之大也不难设想。所以有人认为,药品特别是农药,应在确认其安全性之后才能使用。也有人认为,
The concept of disease In recent years, the production of seaweed in Japan has generally stabilized at 8.0 billion, and it seems that people often think that there is no disease problem. In fact, however, there are always some diseases occurring in some areas of marine culture each year. The characteristic of the laver damage is that even if it does not affect the output, the quality of the product will be greatly reduced due to the occurrence of the disease, which greatly affects the output value. Therefore, the prevention of disease is very important. For a time, people have tried to develop effective pharmaceutical research. However, in the shallow sea area where seaweed is cultivated, other aquatic economic activities and plants are densely distributed. From the point of view that water is a biological medium, the influence of the medicament on other organisms is not hard to imagine. Therefore, some people think that drugs, especially pesticides, should be used only after confirming their safety. Some people think that,