- Author: Brad Hanson
Two links to recent BBC news articles on invasive weeds.
The first one is about a weed that should be familiar to anyone who has traveled in much of the intermountain west - cheatgrass (Bromus tectorum). The BBC article entitled "Wildfires fanned by invasive grass species" is a popular press discussion of recently article by Balch et al. in the scientific journal Global Change Biology. The focus of the research and reports was to discuss the effects that this fast growing (and fast dying) weed has on fire cycles and fire severity in the western US. Very interesting!
The second one, "
Yellowflag iris (Iris pseudacorus L.), native to Europe, is an emergent invasive of pond margins, ditches, and other wetland sites in much of the United States. It forms dense stands which displace native sedges and rushes, reducing waterfowl habitat and water flow. Yellowflag iris reproduces by seeds and through rhizome fragmentation. The rhizomes make it hard to remove mechanically. Accessing an infestation for making herbicide applications can be problematic. Because of its height and density, and because it grows in shallow water and mud, yellowflag iris is difficult to treat with hand-held booms or mounted...
- Author: Gale Perez
Small smutgrass (Sporobolus indicus) is a grass that grows well in irrigated pastures but is not palatable to livestock. So what happens if it grows well and it doesn't get eaten? It takes over the pasture! Learn some simple control measures that will keep this weed in check.
- Author: Brad Hanson
Last Thursday (July 19th) was the 56th annual UC Weed Day at the Davis campus.
We had a really good turnout again this year with just under 150 participants including weed science researchers, students, farmers, land managers, pest consultants, and government agency people in attendance. Cooperative Extension Specialist Tom Lanini organized the morning field tour and afternoon presentation session and ordered up really great weather for the day.
We started out on campus for registration and signing up for various continuing educaton credits before heading out on two buses and a parade of trucks and vans to the...
The Mediterranean annual grass barb goatgrass (Aegilops triuncialis) is widely hated by land managers, and with good reason. Grazers avoid its tough, silica-rich foliage. In early summer it produces big, centipede-like, spiny-awned seedheads, which we call “crotch rockets” on account of what they do when they get inside your pants leg. Barb goatgrass is also tolerant of serpentine soils, presenting a threat to some California endemic species. Many ranchers consider this grass a greater problem than medusahead.
As with any invasive grass, it is difficult to selectively remove barb goatgrass from grasslands. Because it goes to seed late in the season, after most desirable...