Zoysia is the name of a genus of creeping grasses. There are eight species within the Zoysia genus. Zoysia grass originates in eastern and southeastern Asia, as well as Australasia. Zoysia grass appears on grasslands or along the coast. The name comes from Karl von Zois, who was a botanist from Austria. As with most plants, there are various diseases associated with Zoysia grass.
Leaf spot is a Zoysia grass disease that tends to happen with warm days and cooler evenings. This condition results from extremely dry conditions and insufficient proper fertilization. With leaf spot, tiny lesions with patterns appear on grass blades. Abundant watering and application of fertilizer a minimum of once a week should eliminate this problem.
Brown patch is one of the most common Zoysia grass diseases. This disease can be easily identified. Brown patch is characterized by unusual brown rings with green middles. These are fungal spores of dead patches, and cannot be removed completely.
The best way to combat brown patch is by maintaining healthy Zoysia grass in order to make it less susceptible in the future. This can be done by fertilizing only when necessary and watering during the morning (after all of the dew has dried completely). Fungicides can also protect against this disease.
Zoysia grass rust occurs when weather conditions are both moist and cool. Rust disease is characterized by powdery, orange substances appearing on the grass. This situation can be handled by picking up all grass clippings during or after mowing the lawn, and then throwing them away properly (to make sure the disease does not spread). Fungicides can also be used to manage this disease.
The majority of Zoysia grass diseases occur due to abnormal environmental conditions or inadequate management procedures. These situations can cause the Zoysia grass to become weaker and therefore, much more prone to develop diseases.
Mowing the law improperly can also lead to Zoysia grass having a diseased appearance and perhaps even dying. Improper or inadequate fertilization and over-watering can cause spongy and thick masses of dying and dead roots, stems and shoots to accumulate above the surface of the soil. This is known as thatch. To combat this problem, it might be necessary to mechanically get rid of it, through either power raking or vertical mowing.