Tag Archives: university of california

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weedy rice

Continue to keep eyes peeled for weedy rice in California fields. • By Vicky Boyd, Editor • The amount of California rice ground infested with weedy rice hovers around 14,000 acres, leading experts to believe that pest control advisers and growers are carefully scouting for the pest. And they hope the diligence continues. “We had three new sites (in 2019), ... Read More »

UC seeks cooperators for tadpole shrimp pyrethroid-resistance study

tadpole shrimp

• By Luis Espino and Ian Grettenberger • Do you want to make sure your freshly planted rice fields don’t look like the muddied mess on the left below (versus clear on right) following a pyrethroid application? Wondering if your tadpole shrimp are becoming less susceptible to pyrethroids? We do too! Pyrethroids are widely used for managing tadpole shrimp, and ... Read More »

Despite wet winter, UC yield contest winners still cut 100-plus cwt/acre

UCCE yield contest

• By Bruce Linquist • In 2015, University of California Cooperative Extension started the UCCE Rice Yield Contest as a pilot study in Butte County. The contest has now expanded to include all of the Sacramento Valley.Because of potential regional yield differences, the valley was divided into regions (1-NE, 2-NW, 3-S) using the Sacramento River and Highway 20 as dividing ... Read More »

UC begins surveying rice fields for weeds

Monochoria vaginalis

• By Whitney Brim-DeForest • Similar to the disease survey we did last month, University of California Cooperative Extension will be surveying rice weeds this fall. The survey implementation was funded by the Rice Research Board in 2019, and pending the results of the survey this year, we plan to repeat the survey every five years, similar to the ongoing ... Read More »

Monitoring armyworms in rice helps reduce damage

california armyworms

Armyworms can be a serious pest in rice as the larvae can eat the rice leaves or panicles and cause yield reductions. In 2015, a severe outbreak of armyworms caught California rice growers by surprise, resulting in yield losses. In a 2018 survey conducted by University of California Cooperative Extension, rice growers reported average yield losses in 2015 ranging from ... Read More »

California Rice Field Day showcases varietal advancements

teresa de leon

• By Vicky Boyd, Editor • Rice breeders at the California Rice Experiment Station are on a roll, having released nine improved varieties in the past 10 years. And their success appears to be continuing as they have two lines — 12Y2175 and 14Y1006 — being considered for potential release in the next few years, said Virgilio “Butz” Andaya, director ... Read More »

UC hosts free weedy rice workshop, Aug. 1

The University of California Cooperative Extension will host a free weedy rice workshop, from 10 a.m.-noon, Aug. 1, at the Colusa Casino Chairman’s Room in Colusa. Weedy rice, an all-inclusive term for red rice and undesirable outcrossings, was confirmed in about six California rice fields in 2003. By 2016, it had exploded and had been found in about 60 fields ... Read More »

Rice fields provide protected habitat for young salmon

paul buttner, california rice commissioin

• By Bob Johnson • A team of researchers is waiting to learn how many of the small chinook salmon that were raised on the healthiest of food in Mike Dewit’s rice field in the Yolo Bypass, fitted with microtransmitters, and released into the Sacramento River in late April survive the arduous journey to San Francisco Bay and the ocean ... Read More »

3 ways to manage nitrogen fertilizer when it rains during planting

aqua N application rig

• By Bruce Linquist • Rain in May, especially in the amounts we have seen this year, are far from ideal for rice growers. It makes establishing seedling, nitrogen management and weed control extra challenging. Rain in May is not new. In 1995, 1996, 1998 and 2005, average May rainfall in the Sacramento Valley was 2.3 inches and average statewide ... Read More »

Not all brown moths are armyworm adults — get to know thy enemy

Yellowstriped armyworm adult

• By Luis Espino • Over the winter, I gave a few presentations that touched on armyworms. In the presentations, I usually had pictures of adult armyworms. Several comments I got after the presentations made me realize that armyworm adult moths sometimes are confused with other moths or butterflies that are seen in abundance at certain times of the year. ... Read More »