Weeds compete with crops for light, water, and nutrients, which can result in yield reductions. Weeds can also interfere with crop production by serving as alternate hosts for pests and pathogens, providing habitat for rodents, and impeding harvest operations, among other impacts. Natural areas can also be impacted by weed species when they reduce aesthetics and disrupt ecosystem services. As a consequence, growers and land managers employ a variety of control strategies, including the application of herbicides, to manage unwanted vegetation.

Although herbicides can be effective tools for controlling undesirable plants, failures can and do occur. Weeds may escape chemical treatments for several reasons including: the selection...

Last winter, many growers and PCAs contacted me because they were having trouble or were largely unable to control Italian ryegrass (Lolium perenne ssp. multiflorum) in their cereal fields.  This grass species (see Photo) is widely spread throughout the Sacramento Valley in orchard and field crops and it can be particularly problematic in winter cereals, as it can reduce yields by 80%, by competing for water and nutrients.  

Italian ryegrass is a really tough weed and the application timing is extremely important. Osprey, Simplicity and Axial are usually effective. However, all these herbicides will not work if applied when the ryegrass population in your field...

A forwarded request for California participation in research on herbicide resistance and integrated weed management. 

Take care,

Brad

As troublesome herbicide resistant weeds continue to develop and spread across the United States, effective weed management strategies require the use of multiple effective techniques to be used rather than relying on a singular method of weed control. Integrated weed management (IWM) is the practice of utilizing multiple weed management tactics to achieve weed suppression superior to what a single tactic could...

There are two (2) new posts on the UC Rice Blog written by Whitney Brim-DeForest, Cooperative Extension Rice Advisor.

• It's that time again: Collect Weed Seeds for Herbicide Resistance Testing!