Reposted from the UCANR Sacramento Valley Field Crops blog
Mechanical cultivation is a useful tool in controlling herbicide-resistant Italian ryegrass individuals in a rainfed wheat system but is only about half as effective as Axial in reducing overall pressure from Italian ryegrass (expressed as a percentage of total groundcover). Growers should consider multiple approaches (chemical and mechanical) and integrate IPM strategies to reduce the spread of resistance among...
James Schaeffer and his UCCE and CSU Fresno colleagues are conducting a survey to gather information on a relatively new weed problem in orchard crops of the San Joaquin Valley. The species, alkaliweed (Cressa truxillensis) is a native perennial that can be a really difficult weed to control because 1) it is a perennial so not very senstive to PRE herbidies, 2) it is not very sensitive to glyphosate, and 3) it is very tolerant of saline soils where many other plant species do not grow well.
James' request and link to the survey is below
A forwarded request for California participation in research on herbicide resistance and integrated weed management.
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...
Several researchers in the UCD weed science program have been working on various aspects of glyphosate-resistant junglerice (Echinochloa colona) for the past few years. One of our undergraduate student interns, presented a poster at the 2018 Plant and Soil Conference (the California Chapter of the American Society of Agronomy) earlier this month in Fresno.
Drew reported on the (still in process) results of an experiment in which we grew seven populations of junglerice in growth chambers at 20, 30, and 40 C (~68, 86, 104 F) and treated them with a range of glyphosate doses (0, 0.5, and 1 lb ae/A). Drew, Sarah, and other lab members collected data on growth (biomass...
In our post yesterday, we shared the results of some of Caio's field research on management of the multiple-resistant Italian ryegrass population from the Sacramento Valley. In addition to that applied-research, Caio has also been doing some really interesting basic-research trying to understand the biochemical mechanisms of resistance to paraquat in that population.
Toward that end, his first peer-reviewed scientific journal article on that research was published recently in the open-access journal Frontiers in Plant Science. If you'd like to take a look at some of the technical results, here's a link to the article "