It is getting close to the time we need to scout for weedy rice. Our team will be scouting known infested fields that are planted to rice this year. Troy Clark, our Rice Junior Specialist, will be starting in the next few weeks, and will be reaching out to growers and PCA's. Like always, the more eyes on the ground we have, the better! So we are asking for everyone to please scout their own fields to look for suspicious plants.
For timing of scouting, the best time to start, is if you have applied all herbicides to control grasses, and you are still seeing what appear to be skips or misses in grass control. At that point, it is a good idea to go out and check the plants. If they do not have a ligule and auricle, then they...
2020 Survey Update
Weedy rice was found in California on a large scale in 2016, over 8 counties, after having been only found in a few fields in one county prior to 2008. In 2020, University of California Cooperative Extension conducted a comprehensive survey. The objectives of this survey were to determine: 1) presence-absence of weedy rice, 2) to determine infestation level, and 3) to determine if there was any pattern to the distribution of weedy rice biotypes.
A survey was conducted from June thru September 2020 across eight counties (Glenn, Butte, Colusa, Sutter, Yolo, Yuba, Placer and Sacramento). Each field was surveyed on an individual basin level. Each basin was surveyed by.../h3>
- Author: Whitney Brim-DeForest
We are having more and more difficulties controlling watergrass over the past 20 or so years. We know that as of the early 2000s, we had found multiple-herbicide resistant late watergrass (also known as mimic), as well as multiple-herbicide resistant barnyardgrass. For early watergrass, we now have resistant biotypes (to thiobencarb), with none recorded as being multiple-herbicide resistant.
In 2017, two rice fields were identified with an unknown watergrass biotype (or species) that looked very different than the three main known species that infest California rice fields (late watergrass, early watergrass, and barnyardgrass). Both fields had...
- Author: Todd Fitchette
- Posted by: Gale Perez
From Western FarmPress
The UC is suggesting practices that could help control spread of the wild rice type.
Written by Todd Fitchette | Apr 20, 2021
California rice growers with troublesome patches of weedy rice, or red rice, may want to.../h3>