- Author: Mariano Galla
Feather fingergrass, a summer annual weed native to warm temperate regions worldwide is becoming more and more common in the northern Sacramento Valley. It can be found in agricultural fields, orchards, roadsides and canals. This tuft forming grass, can be 1.5 to 2.5 feet tall and forms umbel like inflorescence: a cluster of short stalks originating from a common point, somewhat like umbrella ribs.
Feather fingergrass is a tough weed and it can be difficult to control. In addition, cases of glyphosate resistant populations have been reported in other countries and thus, unfortunately, it may develop resistance in California too.
I am planning to conduct some herbicide screening trials to evaluate control options and...
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 "
- Author: Caio Brunharo
- Author: Brad Hanson
Article written by UC Davis PhD student Caio Brunharo from his dissertation research. It was originally posted in the September 2017 "Weed Management Notes" newsletter from the UC Cooperative Extension office in Glenn County by new weed science and agronomy Farm Advisor Mariano Galla (also a UCD PhD student in weed science!).
Take care, Brad
As most orchardists and pest control advisors are well aware, glyphosate-resistant weeds have been one of the biggest weed management challenges in California orchard crops for several years.
Depending on where you are located in the Central Valley, your biggest challenges in the glyphosate-resistant weed department are probably one or more of the following winter annual weeds. In the San Joaquin Valley, hairy fleabane and horseweed (also known as mare's tail), dominate. In the Sacramento Valley and in some North coast areas, annual or Italian ryegrass is more common. For an extra challenge, many growers have a mix of several of these, in addition to...
I received notification recently that Rely 280 can now be used in California without growers being required to use a closed mixing and loading system.
According to manufacturer representatives, a revised label has been approved by the California Department of Pesticide Regulation and the US-EPA.
Here's a link to the press release for more info and I've pasted below a particularly important paragraph from that press release:
New inventory of Rely 280 herbicide, which will carry the revised...