About ARAI MASAMI
About 山形県林試
About OTSU SHOEI
About 山形県林試
About SAITO AKIRA
About 山形県林試
About 山形県立林業試験場研究報告
About forest damage
About マツ材線虫病
About Forest tending
About Plant damages caused by Nematodes(=nema,threadworms,eelworms)
About Control of plant diseases and insect damages in general
About 松
About 症状
About 被害
About 拡大
About 開発