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日本北海道造林地区受野鼠为害的面积,随同造林事业的进展越来越扩大,目前,受害面积为两万公顷。大有鼠害不除,就难以推行造林之势,因此,目前制造出许多种杀鼠剂,进行防治,但是,能制造出价格低、毒性大、野鼠不忌避,而对于人、畜又没有危险的药剂,确实有些困难。北海道林业试验场井上元则在1956年到欧美观察虫害防治情况时,却发现一
The area harbored by voles in the afforestation area of Hokkaido in Japan is expanding with the progress made in afforestation. Currently, the area affected is 20,000 hectares. Therefore, many kinds of rodenticides are currently being manufactured for prevention and treatment. However, low prices and high toxicity can be created, and wild animals are not shunned. For humans and animals, there are no Dangerous drugs, really difficult. Hokkaido forestry experiment site Inoue yuan in 1956 to Europe and the United States to observe pest control situation, they found that one