PROBLEM TO BE SOLVED: To provide an algae moss control agent for lawn in which the algae moss growing in the lawn can be controlled, there is not worry of chemical injury to the lawn, crop, and a horticultural plant or the like, safety is very high, and administration is easy and a control method of the algae moss growing in the lawn.SOLUTION: An algae moss control agent for lawn includes succinic acid or a succinic acid derivative shown by formula (1) and at least one compound chosen from those salts as an active ingredient. In the formula (1), R1 and R2 independently denote a hydrogen atom, a C1-14 alkyl group or a C3-8 cycloalkyl group or the like and R3 denotes a hydrogen atom or a sulfo group or the like.COPYRIGHT: (C)2014,JPO&INPIT【課題】芝生に生える藻苔類を防除でき、芝生、農作物、園芸植物などに対する薬害の心配がなく、安全性が非常に高く、且つ管理が容易な芝生用の藻苔類防除剤ならびに芝生に生える藻苔類の防除方法を提供する。【解決手段】式(1)で表されるコハク酸またはコハク酸誘導体、およびそれらの塩から選ばれる少なくとも1つの化合物を活性成分として含有する芝生用の藻苔類防除剤。(式(1)中、R1およびR2は独立して、水素原子、C1-14アルキル基またはC3-8シクロアルキル基など表す。R3は、水素原子またはスルホ基などを表す。)【選択図】なし