PROBLEM TO BE SOLVED: To suppress UV disorder and the onset of tomato virus disease while significantly reducing an amount of light irradiation on a tomato seedling per day.SOLUTION: A device for raising seedlings of tomato has an LED light source (1) that can irradiate a tomato seedling (4) with light of 280 nm or more and 290 nm or less as an effective wavelength component, at an irradiance of 0.3 kJ/m2 or more and 0.4 kJ/m2 or less in the dark period per day.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2019,JPO&INPIT【課題】トマト苗に照射する光の１日当たりの照射量を大幅に低減させつつ、ＵＶ障害およびトマトのウイルス病の発病を抑制する。【解決手段】有効波長成分として２８０ｎｍ以上２９０ｎｍ以下の光を、１日当たり暗期に０．３ｋＪ／ｍ２以上０．４ｋＪ／ｍ２以下の照射量でトマト苗（４）に照射することが可能なＬＥＤ光源（１）を備える。【選択図】図１
