Scalping the lawn in early spring to remove accumulated growth will also help prevent thatch accumulation. Zoysiagrasses are relatively free of serious pest problems. Brownpatch, rust and leaf spot diseases can cause problems in zoysiagrass turf, but the grass usually recovers when environmental conditions change. In intensively maintained lawns, fungicides may be needed to prevent these diseases. In the fall, applications of Banner, Daconil or Bayleton are required to prevent rust on zoysia lawns.
White grubs are the major insect attacking zoysiagrass turf.
Monitoring the soil underlying the turf during summer and fall is the most effective way of preventing a grub problem. When populations of grubs exceed 4 to 5 per square foot of turf, treatment with insecticides is recommended.