Creeping yellow fieldcress (Rorippasylvestris) biology and control

摘要

Yellow fieldcress (Rorippa sylvestris) is a perennial weed in the family Brassicaceae. It grows in moist areas and is found in greenhouse, container and field nurseries. It was introduced into the United States from Europe about 1818 and has becomecommon in ornamental plantings in recent years, especially with the increased popularity of herbaceous perennials. It has spread widely, probably through repeated introductions with herbaceous ornamental propagation material. Yellow fieldcress has been recorded in most northeastern and northwestern states, across the southern provinces of Canada, in some states along the eastern seaboard, and as far south as Texas. It has been found in California in several locations in 1998 and 1999. Yellow fieldcressis a potentially serious problem because of its competition with desirable plants and its ability to spread within the container and nursery industry once it is established. It is often introduced as a root segment. From this root segment many new plantscan be produced in a short period of time. The shoots are very pliable when young and when hand pulled, it leaves behind many root segments to form many new plants. Though plants from a single introduction are mostly sterile and generally do not set seed, there is some indication that fertilization can occur between clones or through out-crossing with R. palustris, another fieldcress in California.