- Author: Thomas Getts
Over the past two seasons I have been involved with testing an experimental herbicide for weed control in alfalfa. There was an initial trial implemented at the Intermountain REC in Tulelake California during the 2019 growing season. The main goal of the trial was to test crop safety of an experimental herbicide on alfalfa where applications were made between cuttings. As I was already putting a trial out, it seemed worthwhile to test various other treatments for comparative crop safety. (Some of the treatments tested are registered for use between cuttings, others are not. Both registered and unregistered products were tested. Always read and follow the label whenever using a pesticide).
However, this blog post is not going to...
- Posted by: Gale Perez
The February 2019 issue of the Farm Advisor's Update by Tom Getts (Weed Ecology and Cropping Systems Advisor) is out.
- Winter Annual Weed Control in Alfalfa (Avoiding Crop Injury with Roundup)
- Purple Flowers, Pokey Leaves and Deep Roots: Canada Thistle Control Trial
- Update: Scotch Thistle Control in the Spring and Fall
The old saying, “Everything's fine until it's not,” comes to mind when dealing with some tough to control perennial weeds in alfalfa production during the summertime. Such was the case for an alfalfa field in the Sacramento Valley, where weed control seemed good up until mid-summer, and then it wasn't. Perennial weeds that started off small and overlooked, grew through the season, persisting through multiple cuttings, including curly dock, plantain, and nutsedge. For tough to control weeds in alfalfa fields, one needs to determine: 1) What types of perennial weeds are present, and 2) How many of them are there, to make a decision on how to manage them. These sorts of weed issues can creep up quickly in older alfalfa...
- Author: Gale Perez
Here's the latest issue of the Lassen Farm Advisor's Update newsletter from Tom Getts, Weed Ecology and Cropping Systems Farm Advisor.
September 2017 Contents:
- Controlling Scotch Thistle with Fall or Spring Applications of Herbicides
- Myrtle Spurge
- Low Lignin Alfalfa: Is It Right For You?
- Upcoming Events
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.