California has abundant wildlands — forests, rangeland, open areas, wildlife refuges and national, state, and local parks — that need protection from invasive plants. Invasive plants affect all Californians by increasing wildfire potential; reducing water resources; accelerating erosion and flooding; threatening wildlife; degrading range, crop and timberland; and diminishing outdoor recreation opportunities. According to the California Invasive Plant Council (Cal-IPC), more than 200 identified plant species harm California's wildlands.
As the days get shorter and the temperatures begin to cool, now is the time to practice weed management for annual cool-season weeds. It's also not too early to consider management for weeds that emerge in springtime.
Using integrated pest management (IPM) methods can help reduce the presence of most weeds. In lawns, good practices such as proper watering, mowing, and fertilizing can help maintain healthy turfgrass. Likewise, in landscapes, hand-weeding, cultivation, and use of mulches can be effective in controlling weeds. More specific information about these and other IPM practices can be found in our Pest Notes publications on
- Author: Elaine Lander
Brooms are shrubs which were originally planted in California as ornamentals and for erosion control, but are now considered to be invasive weeds since they are highly competitive. They crowd out native plants and form impenetrable barriers to wildlife. There are four common species of broom in California: Scotch broom, French broom, Spanish broom and Portuguese broom.
In the newly revised Pest Notes: Brooms, UCCE advisor Scott Oneto and UC Davis weed scientists Joe DiTomaso and Guy Kyser explain the issues with planting these invasive species. The publication includes expanded sections on biology and management and updated herbicide...
Plantains are common weeds in lawns, athletic fields, ornamental plantings, roadsides, and pastures. Two species, broadleaf and buckhorn plantains (Plantago major and P. lanceolate) are commonly found throughout California year-round.
Plantains grow well in irrigated turf and lawns that are frequently mowed since they grow low to the ground. They can be a major pest for turfgrass managers since they grow in dense clumps, creating both an aesthetic and tripping hazard in turf. When plantains infest ornamental plantings, they can crowd out desired plants.
These weeds are difficult to control because they can resprout from the crown, even after it's cut off. Early removal of seedlings before they...
Public concern regarding the risk of illness from long-term exposure to glyphosate is on the rise. In order to reduce exposure to this common herbicide, or any other pesticide, it's important that applicators wear the right personal protective equipment (PPE), not only for personal safety, but also to comply with California regulations.
Signal words and glyphosate
Pesticide labels contain a signal word, which describes the effects of acute or immediate toxicity from unprotected exposure to the chemical. Signal words are CAUTION, WARNING, DANGER, and DANGER-POISON (see the Spring 2019 issue of the retail newsletter for more/h2>