To provide a pine withering prevention method capable of preventing pine withering effectively in a short term and without having an effect on the human and beast or environments at all, by returning it to the originally proper natural environments, and provide a pine withering prevention agent.SOLUTION: A pine withering prevention method is configured as follows: a pine withering prevention agent obtained by further adding fulvic acid iron or humic acid iron to oyster shells containing a lot of mineral, amino acid, high quality microorganism and the fulvic acid iron is given to the pine, and thereby an amount of pine nicotine secreted by the pine is increased； the pine wood nematodes are prevented from invasion or killed by an osmotic pressure difference between the pine nicotine and the body fluid of the pine wood nematode being parasitic on the pine, and the pH of the pine nicotine becoming a value being near to 7.5； and the spotted beetles for transmitting the pine wood nematode are prevented from laying eggs, or the laid eggs are exterminated, and thereby the pine withering of the pine is prevented.SELECTED DRAWING: Figure 4【課題】短期間で効果的に、かつ人畜や環境への影響も全くなく、本来あるべき自然環境に戻し、松枯れを防止できる松枯れ防止方法および松枯れ防止剤を提供すること。【解決手段】多くのミネラル、アミノ酸、良質の微生物及びフルボ酸鉄を含むかき殻にさらにフルボ酸鉄またはフミン酸鉄を添加した松枯れ防止剤を松に与え、前記松が分泌する松ヤニの量を増加させ、前記松ヤニと前記松に寄生するマツノザイセンチュウの体液との浸透圧差および前記松ヤニのｐＨが７．５に近い値になることによってマツノザイセンチュウの侵入を防止または殺虫し、かつマツノザイセンチュウを媒介するマダラカミキリムシに卵を産ませないまたは産んだ卵を駆除することによって、前記松の松枯れを防止する松枯れ防止方法。【選択図】図４
