Tag Archives: university of california

UC researchers seek cooperators for pyrethroid-resistant shrimp study

tadpole shrimp

• By Ian Grettenberger, Luis Espino and Madi Hendrick • Pyrethroids have been the go-to material of choice for tadpole shrimp management. Because they are widely used, there is a real concern that resistance to one or multiple active ingredients in this class (e.g., lambda cyhalothrin and zeta-cypermethrin). As many of you may have heard, resistance appears to have cropped ... Read More »

UCCE plans half-day pest management webinar, Dec. 9

california armyworms

University of California Cooperative Extension will hold a half-day educational webinar, Dec. 9, covering Sacramento Valley pest management. Among the topics are an update on rice weeds by Whitney Brim-Deforest and an update on rice pest management by Luis Espino. The meeting will run from 8 a.m.m-noon Pacific Standard Time. The cost is $25, and Califoria Department of Pesticide Regulation ... Read More »

UC offers pest management webinar series, including one on rice

ucce logo

University of California Cooperative Extension in Sutter, Yuba and Colusa counties will hold a series of webinars in September and October to provide research updates on some Sacramento Valley’s major crops, including rice. The classes are relevant to growers throughout California and are primarily focused on pest management and pesticide safety. Both PCA and CCA credits are available. The Sept. ... Read More »

UC Cooperative Extension seeks input on research, Extension efforts

luis espino, bruce linquist

University of California Cooperative Extension is seeking input from California growers of field crops, consultants and allied industry on how the division should approach research and Extension efforts. “Your input will highlight the most important issues facing field crop production in California and help us set priorities for future programming,” according to a news release. As a result, UCCE has ... Read More »

Cold nighttime temps during booting may affect rice yields

• By Bruce Linquist • The period between panicle initiation (PI) and heading is critical with respect to grain formation. During this time, cold temperatures can result in pollen sterility as the plants go through meiosis. Pollen sterility results in blanking. Nighttime temperatures below 58 degrees Fahrenheit can result in sterility. The figure below shows the relationship between average low ... Read More »

UCCE publishes 6 rice fact sheets, more on the way

ucce rice fact sheet

The University of California Cooperative Extension Rice Team has developed a series of fact sheets to simplify and convey information about important topics that they frequently discuss with growers and pest control advisers. Each fact sheet is two pages long, back to front. There are six so far: Fact Sheet #1: Nutrients in Rice Grain and Straw at Harvest Fact Sheet ... Read More »

Still a perplexing problem

automated traps

California researchers continue work to unravel armyworm dynamics and trapping results. • By Vicky Boyd, Editor • Dr. Luis Espino, a University of California Cooperative Extension rice systems adviser, had hoped pheromone traps could provide an early warning system for true armyworm infestations as they have worm pests in other crops. But after two years of running a network of ... Read More »

Stay alert

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 »