Q: My sunny zoysia lawn has rust disease now in late July. I’ve treated it with fungicide and fertilized twice but I’m not sure it is getting much better.

A: Rust seems to be associated with zoysiagrass more than the other lawn grasses. The disease favors high humidity and temperatures between 65°F and 85°F. Rust becomes a problem when grass plants are growing slowly. When turf plants are growing fairly rapidly, leaf tissues are removed by mowing at relatively frequent intervals and the disease does not become apparent.

Fertilize your lawn again and mow frequently to bring the disease under control.