- (Focus Area) Pest Management
- Author: Whitney B Brim-Deforest
- Posted by: Gale Perez
This year brings several new chemical tools to California rice. With many herbicide-resistant species as well as emerging problematic weed species, the new chemistries are a welcome tool for managing resistance and preventing the selection of resistant biotypes.
Cliffhanger™ (benzobicyclon) was just registered in 2024, and is a new formulation of a previously-registered granular product already widely in use in California rice. Since it can be applied as a foliar product, it expands the timing that benzobicyclon can be applied in the flooded system. It can also be applied as a direct-stream application into the water. It is an HPPD-inhibitor, providing a good option for rotation. It controls sprangletop, ricefield bulrush and smallflower umbrella sedge. Additional tank-mix testing will be occurring this season to determine if it might be a good partner in combination with other herbicides for added late-season watergrass control.
The last product recently registered is Zembu™ (pyraclonil). Zembu™ is a granular formulation of pyraclonil, applied pre-emergence or at day-of-seeding into a flooded field. It provides control of smallflower umbrella sedge and broadleaf weeds, and provides suppression of watergrass. As a PPO-inhibitor, it is a new mode of action for watergrass, as the only other PPO-inhibitor registered in California rice only has activity on sedges. It will provide a great rotational option for growers at the beginning of the season, as well as a great partner product (for added control) with other granular into-the-water products.
As always, the label is the law, so make sure to read and follow the current labels for each of these herbicides (found on the manufacturers website or at the Department of Pesticide Regulation's website). Also check in locally with your Agricultural Commissioner's office for training information and any other county-specific requirements.
With these three new options, as well as the currently-registered products, rice growers in California should have a great suite of tools available this year, both for resistance management as well as to prevent the selection of future resistance. For help planning a weed management program, please reach out to your local Rice Farm Advisor.
Original source: UC Rice Notes newsletter • April 2024
- Posted by: Gale Perez
From the eOrganic and Performance and Economics of Electric Weed Control in Organic Perennial Crops Project:
Electric Weeding Research Updates
(Click HERE to see the presentations)
- Electric Weed Control in Orchards • Tong Zhen, Ph.D. student (Hanson Lab) at UC Davis
- Crop Safety and Weed Control in Organic Highbush Blueberries Using Electric Weeding • Luisa Baccin, Ph.D. student (Moretti Lab) at Oregon State University
/h3>
- Author: Kathy Keatley Garvey
Don't head over to the Bohart Museum of Entomology in the Academic Surge Building on Crocker Lane on Saturday, April 20 during the 110th annual UC Davis Picnic Day.
Why?
It will be closed.
The Bohart Museum, part of the UC Davis Department of Entomology and Nematology (ENT), will be staffing a pop-up tent from noon to 4 p.m. in front of Briggs Hall, home of the department.
That means all the "bug" displays at the 2024 UC Picnic Day will be at one place: Briggs Hall. The Bohart has provided a QR code and the location:
https://maps.app.goo.gl/DLBmhLuEnP1rWjn67.
Tabatha Yang, education and outreach coordinator, says the Bohart Museum is planning four areas of interest:
- The "Oh, my drawers," (California arachnids and wing diversity showcasing cicadas and California dogface butterflies.
- Petting zoo of live insects (thorny sticks), which attendees can hold and photograph. Also shown will be a cicada nymph (from retired Bohart senior museum scientist Steve Heydon) and horntail caterpillars from UC Davis biology lab manager and UC Davis alumna Ivana Li.
- A Bohart poster giveaway--California dogface butterflies.
- A dogface butterfly face banner where attendees can pose for photos
The California dogface butterfly, Zerene eurydice, is California's state insect, as authorized by the State Legislature in 1972. The butterfly is found only in California, from the foothills of the Sierra Nevada to the Coast Ranges and from Sonoma south to San Diego. Its most prevalent habitat is in Auburn at the Placer Land Trust's private conservation site (which the public can see through specially guided tours). Why is it there? Because its larval host plant, false indigo (Amorpha californica) thrives there.
The male, which sports a yellow silhouette of a dog's head on its wings, is known as "the flying pansy." The female is mostly solid yellow except for a single black spot on its upper wings.
Kareofelas serves as a docent or volunteer tour guide for the Placer Land Trust's dogface butterfly site. He has reared--and photographed--a dogface butterfly from egg to adult. And he's also grown false indigo.
The posters to be given away Saturday--until gone--are the work of Kareofelas and Keller and depict the male and female butterfly.
Theme of the Bohart Museum's Picnic Day display is "Bonding with the Bohart," in reference to Professor Jason Bond, who succeeded UC Davis distinguished professor emerita Lynn Kimsey as director on Feb. 1. Kimsey served 34 years as the director. Although officially retired from the university, she continues to serve as a researcher, and as the executive director of the Bohart Museum Society and editor of the newsletter. Bond is the Evert and Marion Schlinger Endowed Chair of the Department of Entomology and Nematology, and the associate dean, UC Davis College of Agricultural and Environmental Sciences. He also serves as president-elect of the American Arachnological Society.
In addition to the Bohart Museum displays, the entomological events at Briggs Hall will include:
Bug Doctor
Briggs Hall Entryway
Graduate students will answer questions about insects. What's that bug? Attendees are encouraged to bring an insect or photo for identification.
Cockroach Races
Front of Briggs Hall
American cockroaches, Periplaneta americana, from Bob Kimsey's forensic lab, race on a specially made track, while roach fans cheer for their favorites. (Sometimes the athletes are named for faculty, friends or bystanders.
Medical Entomology
122 Briggs Hall
Carla-Cristina "CC" Melo Edwards of the Geoffrey Attardo lab is coordinating the medical entomology display. Her research focuses on investigating the physiological mechanisms underlying pyrethroid resistance in Aedes aegypti (the yellow fever mosquito).
Diversity of Arachnids
122 Briggs Hall
Doctoral student Emma Jochim of the Jason Bond lab is coordinating an exhibit she created last year to display the diversity of arachnids, such as vinegaroons, whip spiders, tarantulas, and scorpions. "We'll have live animals and fact sheets that will give a general overview of their diversity, behavior, and habitat," Jochim said. "I'll also bring some curated specimens to show what goes into creating a scientific collection and talk about why collections are important for understanding biodiversity. "
Maggot Art
Briggs Courtyard
Artists--children and adults alike--create maggot art by dipping a live maggot into water-based, non-toxic paint. It's suitable for framing (or at least a spot on the refrigerator door). This activity will close at 3.
Dr. Death
122 Briggs Hall
Forensic entomologist Robert Kimsey will display and discuss his work.
Entomology at UC Davis
122 Briggs Hall
Displays of insects, including bees, ants and more. Graduate students, faculty and emeriti will staff the tables.
Fly-Tying
Briggs Hall courtyard
Fly Fishers of Davis will show attendees how to tie a fly. The recipients take home the flies.
Insect-Themed T-Shirt Sales
Briggs Hall entryway
Members of the Entomology Graduate Student Association (EGSA), led by president Mia Lippey, will be selling their popular insect-themed t-shirts, including The Beetles.
Mosquito Control Booth
Entrance to Briggs (below front steps)
Sacramento-Yolo Mosquito and Vector Control District will be providing information on mosquitoes, answering questions, and offering give-a-ways.
UC Statewide Integrated Pest Management (UC IPM)
Briggs Hall Courtyard
“We plan to have many of our usual materials on display and will be giving out the live lady beetles (aka ladybugs) again,” said urban and community IPM educator Lauren Fordyce. “We purchase them from a local garden center. In addition to that, we plan to have a prize wheel that adults and kids can spin, answer a question, and win a prize if they answer correctly. We may also have temporary insect tattoos to give away.”
- Author: Lauren Fordyce
While preparing your garden for planting this spring, you may have found white grubs in the soil. Discovering these fairly large, white grubs can be alarming, but they usually won't cause significant plant damage.
Grubs are the soil-dwelling larvae of beetles in the Scarabaeidae family, also simply called scarabs. They are generally curled in a C-shape with whitish bodies and 6 legs. Grubs of some species may be less than 0.5 inch long, while other species may be up to 2 inches. Some grubs feed on living plant material while others do not.
Masked chafer beetle grubs are often what people find in garden beds in California. If you find large grubs in compost, those are likely the larvae of the green fruit beetle (also commonly called figeater beetle and green fig beetle). Japanese beetles are not usually present in California, but there are a few small hot spots under eradication efforts by the California Department of Food and Agriculture.
In most cases, the presence of grubs does not require pesticide treatment and populations of 6 or less per square foot won't cause significant damage. If you notice them in your garden beds, they can be hand-picked and killed. Some may choose to feed them to their backyard chickens or leave them out for wild birds. Beneficial nematodes can be applied to control grub infestations.
To learn more about common white grubs, visit https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=56797
- Author: Trina Kleist
- Posted by: Gale Perez
Hanson: “Some weeds you can only eat once”
Our weed doctors will be available to identify weeds and give people advice during the UC Davis Picnic Day this year, from 10 a.m. to 2 p.m. Saturday, April 20, in the Plant & Environmental Sciences (PES) Building courtyard. Research staff have collected seasonal weeds for their “weed petting zoo” to help you identify what's in your lawn, flower bed or horse pasture.
People often ask for low-cost, easy and chemical-free solutions to eradicate weeds, said scientist Brad Hanson. “I usually tell them, ‘Weeds are weeds for a reason,' and they might be more successful if they pick two of those three specifications.” In the case of stubborn perennial pests, the weed doctors can recommend an effective herbicide.
Weeds are a huge problem in our natural lands, too. “Besides affecting landscapes and agricultural fields, weeds are driving ecosystem changes and altering fire regimes in California,” said weed and restoration specialist Justin Valliere. “In many cases, ecological restoration is primarily related to managing and preventing weed invasions.”
Careful what you eat!
Also at this year's "Ask the Weed Doctor" booth will be Jens Beets, the new research ecologist with the United States Department of Agriculture's Agricultural Research Service. Based at UC Davis, Beets is an expert in aquatic plant management.
Information also will be available about aquatic weeds.
Visitors can take home information sheets describing pests and guides from the University of California's Statewide Integrated Pest Management Program. Weed doctors also can point visitors to helpful books, local resources such as a UC Master Gardeners group, and online resources, Hanson added.
Faculty with the Weed Research and Information Center enjoy meeting people and hearing about their weeds. A memorable conversation, Hanson recalled, went like this: “Hey, this one shouldn't be called a weed! If you pick it when it's tender, you can eat it in a salad.” To that, the weed doctor responded, “You can eat any weed, but some of them you only eat once!”
Check out all the information available at the UC Weed Research and Information Center.
Original source: UCD Plant Sciences website • NEWS April 11, 2024