Rust on Duchesnea
Duchesnea indica (Andre) Focke, a plant native to southern Asia, is a common ground cover in California. It is very similar to wild strawberry, Fragaria chiloensis Du chesne, which is also used as a ground cover. Duchesnea differs in that it has yellow flowers instead of white. Also, the calyx of Duchesnea is five-parted and the lobes alternate with large, three- to five-toothed bracts. The fruit is dry and mealy as contrasted with the edible fruit of F. chiloensis. However, the form of this species used as a ground cover produces only male flowers and rarely sets fruit.
Source: • University of California Flower and Nursery Report