Glenn

As many of you are aware, many of our grass species in California rice are resistant to multiple herbicides. Late watergrass aka "mimic" (Echinochloa phyllopogon), early watergrass (E. oryzoides) and barnyardgrass (E.

We are seeing severe armyworm infestations in the field. Moth numbers have stayed relatively constant in a few locations, still on the increase in Sutter and Yolo counties. This means that egg laying may continue and we may have more worms coming up.

UC Cooperative Extension has augmented efforts to monitor armyworm populations in rice fields since 2015 when we observed large populations earlier in the year (June) than previously observed. Here in San Joaquin County, we began monitoring in Delta rice fields a couple weeks ago.

I have received reports of significant defoliation due to armyworms from several areas: Glenn, Colusa, Butte and Yolo counties. In most areas the defoliation is severe but the area affected within fields still small. I inspected a field in Glenn County.

CASI's Betsy Karle, UCCE Glenn County, Marsha Campbell, UCCE Stanislaus County, and Jeff Mitchell, UC Davis Plant Sciences, met with UC ANR Associate Vice President, Wendy Powers, and Statewide Programs Director, Mark Bell in the ANR state offices in Davis, CA on June 20 to update them on the histor...

Moth numbers have increased since the week of June 12, specially in the Colusa trap. The degree day model predicted worms in the fifth instar by June 22; I'm starting to receive reports of worms in Colusa, Glenn and Butte counties.

The number of moths trapped has increased in all locations, except in the North Sutter one (which was already high to begin with). In most fields the rice is still in the three to five leaf stage.

Grow Rice? Help Birds! Rice provides livelihoods and food for people and places to rest and feed for many birds, too. Small changes to field management can increase the value of rice fields for the birds that use it.

Editor: Guy B Kyser The giant invasive grass arundo (Arundo donax), one of the weeds targeted under the USDA-ARS-funded Delta Region Areawide Aquatic Weed Project (DRAAWP), has been re-acquainted with one of its natural enemies imported from arundo's native range.

The giant invasive grass arundo (Arundo donax), one of the weeds targeted under the USDA-ARS-funded Delta Region Areawide Aquatic Weed Project (DRAAWP), has been re-acquainted with one of its natural enemies imported from arundo's native range.