- Author: Luis A Espino
Yesterday, I visited a farm with blast in Glenn County. In this case, the grower seeded M-210, and as an experiment, he planted some M-105 in a very small area at the time of clean up herbicide application. This is a location where blast is common. In fact, last year this location had severe neck blast.
Blast showed up on the M-105 but the M-210 is completely clean. The picture below shows some burned leaves and lesions that could be confused with herbicide burn. However, there are plenty of the typical diamond shaped lesions.
Small area of M-105 surrounded by M-210.
Blast burned down some of the M-105 leaves, resembling a herbicide burn. The M-210 does not have any lesions.
Typical blast lesions found around the M-105 burned leaves.
- Author: Sarah L Marsh
We are excited to announce the launch of a new rice podcast, "Thoughts on Rice", hosted by the UCCE Rice Advisors and found wherever you listen to podcasts.
This podcast is for growers, PCAs, consultants, and other industry professionals in the California rice industry. We'll primarily be focusing on the Sacramento Valley and Delta Region of California. We aim to deliver extension information relating to the California rice industry, but we are also looking for suggestions for topics that would be of interest to our stakeholders! Reach out to your local farm advisor for more information.
The podcast website can be found here.
The feedback poll can be found here:
- Author: Taiyu Guan
Date: August 28th, 2024
Location: Rice Experiment Station
(955 Butte City Hwy., Biggs, CA)
** No Registration Required! **
Meeting Agenda:
7:30 - 8:30 am Registration
- Posters and Demonstrations
8:30 - 9:15 am General Session
- CCRRF Annual Membership Meeting
- Rice Research Trust Report
- California Rice Industry Award
9:30 - Noon Field Tours of Rice Research
- Variety Development
- Disease and Insect Management
- Agronomy and Fertility
- Weed Management
12:00 (Noon) Lunch
2024-Invitation-to-Field-Day
- Author: Taiyu Guan
Date: September 4, 2024
Location: Rice Experiment Station
(955ButteCity Hwy., Biggs, CA)
** Registration and Waiver of Liability Required! **
** Registration Link: Rice Pest Management Course Registration 2024 **
Meeting Agenda:
7:30-8:00 am |
Check-in at Hamilton Road Field |
8:00-8:10 am |
Introduction - WhitneyBrim-DeForest, UCCE |
8:10-9:40 am |
Tour of rice field research plots - Deniz Inci, Saul Estrada, Michael Lynch, UC Davis |
9:40-10:00 am |
Travel from Hamilton Road Field to Rice Experiment Station Morning Break |
10:00-11:00 am |
Breakout Sessions:
|
11:00-11:30 am |
Pest Identification Quiz - Whitney Brim-DeForest, UCCE |
11:30-12:15 pm |
Light Lunch |
12:15-12:30 pm |
Integrated management of rice diseases - Luis Espino, UCCE |
12:30-12:45 pm |
Pesticide laws, regulations, and permit conditions - Craig Riddle, CA Rice Commission |
12:45-1:00 pm |
Integrated management of rice invertebrates - Ian Grettenberger, UC Davis |
1:00-1:15 pm |
Algae and Nostoc management - Jens Beets, USDA |
1:15-1:30 pm |
Afternoon Break |
1:30-1:45 pm |
Common rice permit condition violations - Louie Mendoza, Butte County Ag Commissioner |
1:45-2:00 pm |
New rice herbicides to manage herbicide-resistant weeds in CA - Deniz Inci, UC Davis |
2:00-2:15 pm |
Emerging weeds - Sarah Marsh, UCCE |
2:15-2:30 pm |
Watergrass management and double propanil alternatives - Whitney Brim-DeForest, UCCE |
2:30-2:45 pm |
Evaluation and Wrap-up |
2024 Rice Pest Management Course Agenda.docx
Waiver of Liability
- Author: Luis A Espino
In the last two weeks, I visited a couple of fields suspected of having blast. After looking at the symptoms and the distribution of the lesions in the field, we determined that the injury we were observing was most likely due to herbicide burn. When blast lesions coalesce, they can look a lot like herbicide burn, but with blast you will find some of the typical diamond shape lesions. Also, when blast results in burned holes, you will find a lot of blast lesions around the hole that decrease in density as you move away from the hole.
Herbicide burn that can be confused with blast |
Typical blast diamond shaped lesions |
I have not seen blast lesions this year yet. Looking at leaf wetness and temperature at the field level, we had some good conditions for blast around July 20. This is only an approximation and does not necessarily mean that we will see blast. Remember that two more things are needed to see infections: a susceptible host and the pathogen. Most of our varieties are susceptible, with only M-210 being resistant. At this point we do not have a way to monitor for the presence of the pathogen in the Valley other than by detecting infected fields.
Hours of leaf wetness (LW) required for infection (blue line) and total hours of leaf wetness (orage line). When the orange line intercepts or is higher than the blue, there is enough hours of leaf wetness for blast infection.
I'll keep monitoring and let you know if I see blast in the field.
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