We have become aware that common purslane (Portulaca oleracea, Fig. 1) is an increasing problem in alfalfa fields, particularly during the months of July through September. A pest control advisor (PCA) was recently seeking advice on managing purslane in glyphosate-tolerant alfalfa fields this summer. He said that the purslane was getting raked up into the windrowed hay, and he was concerned that the moisture of the purslane would cause mold and hay discoloration or even spontaneous combustion of the hay once baled. He said that glyphosate was not effective at controlling the purslane, and he was considering applying carfentrazone (Shark) as an in-season, post-emergence herbicide. Let's dissect this situation.
- Author: Gale Perez
The latest edition of the Lassen Farm Advisor's Update newsletter is out. The Feb. 2017 issue contains the following articles:
- Posting of the 2016 Lassen County Weed Research Report
- Description of Other On-going Weed Research Trials
- Roundup Ready Alfalfa: Minimizing Injury While Maximizing Weed Control
The newsletter is written by Tom Getts, Weed Ecology and Cropping Systems Farm Advisor.
Here's the link to the newsletter: http://celassen.ucanr.edu/newsletters/Farm_Advisors_Update67897.pdf....
- Posted by: Gale Perez
The latest issue of Farm Advisor's Update is out (Sept. 2016.)
Here are the articles in the Sept. issue:
- Fall is a Good Time to Think about Weed Control
- Cleaning and Winterizing Spray Equipment
- Parker 3-Step: Digging Way Back in the Files for Range Trends
- Intermountain Alfalfa Weevil Resistance to Pyrethroid Insecticides Confirmed
- Current Research Projects
- Upcoming Events
Click HERE for the newsletter.
Tom Getts is the UC Cooperative Extension Weed...
- Author: Steve Orloff
Alfalfa is an excellent competitor with weeds. There is no better weed control method than a dense stand of alfalfa. However, even with a good stand, some weeds can get a foothold and infest the crop reducing its marketability. Most growers have an effective program to control winter annual weeds with a dormant season herbicide application. When it comes to summer annual weeds, grasses, such as green and yellow foxtail and barnyardgrass (also called watergrass), have historically been the most troublesome. While these weeds continue to be a major issue, there also appears to be an increase in pigweeds (both redroot and Palmer amaranth) in many areas of the state including the Central Valley, Intermountain Region and High...
From the Alfalfa & Forage News blog :: Feb. 18, 2013
Dodder is a troublesome annual parasitic weed that infests alfalfa fields. Initial infestations are usually caused by sowing dodder infested seed (a good reason to purchase Certified seed) and by “sheeping off” fields with sheep that came from an infested field. Perhaps no weed problem is worse than an alfalfa field heavily infested with dodder. As a parasite, it lives at the expense of the alfalfa plant and literally sucks the vigor and life out of the plant. If left uncontrolled it can actually kill the alfalfa plant. It emerges as a rootless shoot and must...