The December 9th webinar will feature an hour of rice presentations given by Luis Espino, Rice Farming Systems Advisor in Butte County and Whitney Brim-DeForest, Rice and Wild Rice Advisor in Sutter-Yuba counties. Espino states, "This was a year with severe rice blast in the northern Sacramento Valley; the presentation will cover blast biology and management information. I will also review arthropod issues such as tadpole shrimp and armyworms.” Brim-DeForest says, “The webinar will cover the latest weed research in rice, including weedy rice, watergrass species, and the 2019 weed survey”.
Amber Vinchesi-Vahl, Vegetable Crops Advisor in Colusa and Sutter-Yuba counties, will provide information on pest management of processing tomatoes, the dominant vegetable crop in the Sacramento Valley. She states, "I will be providing information on important pest issues in commercial processing tomatoes and the latest research updates on disease and weed management."
Sarah Light, Agronomy Advisor for Colusa and Sutter-Yuba counties will present information on area field crops. Light says, "My presentation will cover relevant pest management updates related to field crop production in the region."
The webinar will also include a regulatory update for Sutter County by Scott Bowden, Deputy Agricultural Commissioner/Sealer. This portion of the program will include information on permitting and updates on chlorpyrifos and paraquat.
Enrollment is limited, so register early. The cost is $25 for the 3-hour webinar. For more details or to register, visit http://ucanr.edu/survey/survey.cfm?surveynumber=32431. DPR CE and CCA credits are pending (2 "other" hours and 0.5 Laws & Regs hours).
If you have questions, contact Sarah Light at firstname.lastname@example.org or call the UCCE Sutter-Yuba office at (530) 822-7515.
- Author: Whitney Brim-DeForest
- Author: Roberta Firoved
Since 2019, UCCE Rice Advisor Whitney Brim-DeForest has been testing SUPPRESS® herbicide for use in weed control in rice. In 2019, she collaborated with Jim Cook (Colusa County Farm Supply), to spot spray weedy rice in a field containing Type 3 (long awns, straw hulled). The application was made with a handheld backpack sprayer, at the highest labeled rate. The timing was too close to heading, however, and some of the weedy rice plants recovered.
This past season, in 2020, we did further testing in the field, on several different weedy rice types (field was a mix of Types 1, 2, 3, and 5). The application timing for the field testing in 2020 was made with a handheld backpack sprayer, at the highest labeled rate. The timing was approximately at panicle initiation, and at two weeks after application, the weedy rice plants were 100% controlled. At harvest, there was some regrowth, but none of the plants produced viable panicles.
For use in weedy rice spot spraying in 2021, SUPPRESS® could be an option, but the label does not allow for application when there is standing water in the field. Therefore, in order to be used, the field will need to be drained before application. Application timing is after the last grass herbicide has been applied, but before the weedy rice has started to flower (generally no earlier than 60 days after seeding). Reflooding is recommended within 48 hours of application to reduce the germination of additional weeds, unless the field can remain drained until harvest.
Remember to always follow all label instructions when applying any pesticide, as the label is the law. Make sure to pay particular attention to the Use Precautions and Restrictions. Consult your local Agricultural Commissioner's Office regarding buffer zones and aerial restrictions, before making any applications.
For more information, contact UCCE Rice Advisor, Whitney Brim-DeForest (email@example.com), and Roberta Firoved, Industry Affairs Manager for the California Rice Commission (firstname.lastname@example.org)
University of California Cooperative Extension Sutter-Yuba-Colusa is holding a series of webinars in September and October to provide research updates on some of the major crops in the Sacramento Valley. The classes are relevant to growers throughout California and are primarily focused on pest management and pesticide safety.
The September 9th webinar will feature Franz Niederholzer, Orchard Systems Advisor. "We will be reviewing proven almond IPM practices with an eye to reducing input costs, where possible, while delivering effective pest control," says Niederholzer. He has been working in almonds in the Sacramento Valley for almost 20 years.
Amber Vinchesi-Vahl, Vegetable Crops Advisor, will give her webinar on September 16th. She states, "I will be providing information on important pest issues in vegetables and the latest research updates on disease and weed management in processing tomatoes and cucumber beetles in melons." Her research on tomatoes covers cultivator trials for within-row weed control and monitoring of soilborne fungal pathogens.
Whitney Brim-DeForest, Rice and Wild Rice Advisor, will present September 30th. "The webinar will provide an opportunity for discussion and interaction about weed identification," she says. "We will also cover the latest research updates on specific weed species, resistance management, and new herbicides in rice." The information is relevant to both organic and conventional rice growers, so all are encouraged to attend.
The final webinar will take place on October 7, and will be given by Sarah Light, Agronomy Advisor. Light says, "We will cover opportunities to decrease environmental risk through pesticide selection and application, accurate diagnosis, and reduction of loss to the environment."
Enrollment is limited, so register early. The cost is $20 for 1, $35 for 2, $50 for 3, and $60 for 4 webinars. For more details or to register, visit http://ucanr.edu/syc-uccevirtualwebinars. DPR CE credits have been approved (4 "other" hours total, 1 per class), and CCA credits have been approved for IPM credits (4 hours total, 1 per class).
If you have questions, contact Whitney Brim-DeForest [email@example.com or call the UCCE Sutter-Yuba office at (530) 822-7515].
- Author: Luis Espino
I recently visited a couple of fields that were showing signs of sulfide toxicity. At first sight, the symptoms could be confused with blast. Plants dry out and turn brown, panicles blank out. However, plants affected by sulfide won't have any leaf or neck blast lesions. But the tell sign that sulfide toxicity is the issue are the roots. Affected plants will have black roots that smell like rotten eggs.
Sulfide toxicity occurs in patches, most likely, where organic matter accumulated and water flow is limited.
Roots of plants affected by sulfide turn black and smell like rotten eggs.
Sulfide toxicity happens when soil microbes use sulfate as energy source, and produce hidrogen sulfide as a by product. Normally, the sulfide will precipitate and won't accumulate, but in certain soils sulfide can accumulate and become toxic to the plant. Sulfide toxicity seems to be caused by accumulation of organic matter, such as straw or root balls, that do not decompose completely during the winter time. Irrigation water with high salt content can aggravate the problem, especially in areas where water movement is limited.
Aerating the soil stops the accumulation of sulfide, therefore, draining for harvest will stop the problem.
It's that time again! If you would like to submit seeds for herbicide resistance testing, many weed species will be maturing right about now.
The UCCE Rice Weeds Program tests grower submitted seed samples of potentially herbicide-resistant watergrass species, sprangletop, smallflower umbrella sedge and bulrush. However, we encourage you to submit ANY species that you suspect to be resistant. We keep individual grower information confidential and any reporting of results will not identify individual growers.
Please fill out the form (linked here) for each weed seed sample (each field and/or species). The following tips will ensure that you receive the best possible results:
- The best timing of collection is when the seed easily falls off the seed head by gentle agitation in a paper bag (see video for demonstration):
o For watergrass species, this should be close to rice harvest (seeds should be brownish in color)
o For sprangletop, timing will be earlier, in August or September (seeds will appear greenish)
o For the sedges, timing may be as early as July, all the way through early September
o Smallflower umbrella sedge seed is yellow, with brown hulls (looks like dust)
o Bulrush (roughseed) seeds are black and have small hairs
- Seed should be collected from areas that you know have been sprayed with the suspected herbicide.
- Collect seeds from multiple plants, and the amount should be at least a few handfuls of seed, to ensure sufficient quantity for testing.
- Please do not collect seed from around field margins.
- Allow seed to dry in the paper bag to prevent molding.
Bring the sample and form to your local UCCE Farm Advisor (Whitney, Luis, or Michelle) or send or drop off samples at the Rice Experiment Station (RES) in Biggs. If you need assistance in collection, please contact your Farm Advisor or PCA. Results should be emailed to you in March of 2021.