- Author: John A Roncoroni
Pacific Mosquitofern, (Azolla filculoides) often referred to as Azolla, is native to California. It is considered a desirable component of natural habitats and an important food source for waterfowl. Azolla is a floating aquatic fern that spreads by stem fragments and spores. Azolla as being up to 5cm (2 inches) long, but can be as small as ¼ to ½ inches.
Azolla is often misidentified as duckweed (Lemna spp), another common small floating aquatic plant. Azolla is initially green, like duckweed, but soon turns a red or brown color. This coloration is caused by...
- Author: Gale Perez
Orchard Floor Management Field Day
Demonstration and Herbicide Trial
Located at a Yolo County walnut and almond orchard
Just north of Co rd 98 and Co. rd. 30 (see map)
10 – 11 am Wednesday, April 27, 2011
1 hr CE credit
Weed Experts: Brad Hanson, Weed Specialist, Plant Sciences, UC Davis and John Roncoroni, UCCE Weed Science Farm Advisor, Napa County
Orchard Support: Carolyn DeBuse, UCCE Orchard Systems Farm Advisor, Solano and Yolo Counties
The trials were designed to evaluate premium residual herbicides plus burndown materials for dormant season application in tree nut crops. Several newer materials are being compared to the old standbys for their relative...
- Author: Brad Hanson
Last week I attended the Western Society of Weed Science annual meeting (Spokane, WA). Joe DiTomaso and I were invited to speak in an Education and Regulatory Symposium entitled "Use of New Technology by Weed Science Educators" and I thought I'd share a few thoughts about the session and also my presentation on blogs.
This interesting symposium organized by Marvin Butler from Oregon State University had four speakers plus time for discussion.
First, James Leary from the University of Hawaii at Manoa spoke about "The Virtual Field Day (VFD): Web-based video presentations that extend to a broader audience". He discussed his use of low cost, self edited YouTube...
- Author: Brad Hanson
A quick post today on a recent report of resistance to glufosinate, the active ingredient in Rely herbicide (also sold as Liberty, Ignite, Basta, etc in other markets).
Researchers in Malaysia reported a few years ago on a population of goosegrass resistant to glufosinate in vegetable and orchard systems (Lee L J & Ngim J (2000). A first report of glyphosate-resistant goosegrass (Eleusine indica (L) Gaertn) in Malaysia. Pest Management Science, 56, 336-339). For a number of years this was the only reported case of resistance to this herbicide.
At a meeting last month, I saw a presentation by Wilson Avila and Carol Mallory-Smith from Oregon...
- Author: Brad Hanson
Earlier this month, I attended the 2011 Plant and Soil Conference which was held in Fresno this year. This annual meeting put on by the California Chapter of the American Society of Agronomy (http://calasa.ucdavis.edu/ ) usually has several sessions during the two-day program designed to update Certified Crop Advisors, Pest Control Advisors, and other professional agronomists on current research and regulatory issues. One of the speakers in the Environmental Quality Session, Pam Wofford from CDPR, spoke about reducing emissions of Volatile Organic Compounds (VOC) from pesticides by switching formulations. I thought I’d touch on that issue today.
There are a number of definitions of...
