Moss and algae are found in turf areas because conditions are not good for growing dense, healthy turf. Mosses are small plants, which have a mass of fine stems. Algae are thread-like green plants, which form a thin dense green scum over the soil surface. Neither moss nor algae are thought to be parasite to turf grasses. The green scum formed by algae is relatively impermeable and once it dries out, forms a tough, black crust. Algae will appear more in wet or humid full-sun locations, compacted, water-logged fertile soils with thin, weak turf. Moss tends to take hold in wet or humid shady conditions, acidic, infertile, poorly drained, water-logged soils or areas with excessive thatch, and thin weak turf. If you have an abundance of either moss or algae in an area, you have two choices. First, don't try to grow grass in these areas because the conditions are probably not right for it and you will end up with a constant struggle for healthy grass. Second, if you really want turf in a mossy area you must change the conditions. The changes necessary may include the following: 1. Have the soil tested to determine proper lime and fertilizer needs for the best soil fertility. 2. Improve drainage. This can be done by creating a contour in the soil or by using tile. 3. Increase light penetration and air circulation by trimming low branches in trees and shrubs. In some cases, removal of the least desirable trees may be justified. Using a shade-tolerant grass will help as well. 4. Cultivate compacted soils -Aerifying the soil will help reduce compaction. 5. Avoid excessive irrigation -Keeping the surface moist will only increase problems. Product control of moss and algae is temporary and the problem will recur unless growing conditions are improved. Once you improve the conditions you can then seed for grass..

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