- Author: Oleg Daugovish
- Posted by: Gale Perez
From the Topics in Subtropics blog :: July 5, 2013
It is not always easy to kill weeds with herbicides for several reasons, but if you apply the right material at the right time to susceptible weeds you expect control. But you should never assume it, because resistant weeds rely on this assumption.
Repeated use of herbicides with the same mode of action (usually the same target site within plant) selects for naturally occurring resistance traits in weed population. The few resistant weeds proliferate since there is no longer competition from susceptible types and if other control measures are not...
- Author: Steve Orloff
- Posted by: Gale Perez
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...
- Author: Mark Bolda
- Author: Steven Fennimore
- Author: Patrick Kingston
- Posted by: Gale Perez
From the UC Strawberries and Caneberries blog :: Sept. 11, 2013
Field bindweed, Convolvulus arvensis, also known locally as morning glory, is a persistent weed pest in blackberries grown on the Central Coast of the California. Much of this stems from the long period of time between plant establishment and final removal of the crop some five to six years later.
While cultivation of the aisles between the hedgerows is successful in keeping the field clear of most weeds, field bindweed is another matter. Not only does field bindweed establish very deep root systems which frustrate control by cultivation, but...
- Author: Michelle Leinfelder-Miles
- Posted by: Gale Perez
From the Alfalfa & Forage News blog :: Oct. 25, 2013
Written by Michelle Leinfelder-Miles
At the Alfalfa and Forage Meeting held at the Kearney Agricultural Center in September, we provided a demonstration of the co-existence of Roundup Ready® (RR) and conventional alfalfa hay fields. The demonstration took place between two hay fields – one of them RR and the other conventional – that were in their third year of production and separated only by a one-lane dirt...
- Author: Franz J.A. Niederholzer
- Author: John A Roncoroni
Saving Glyphosate
Glyphosate, the active ingredient in Roundup, is the most commonly used herbicide in California. Highly effective, safe for the user and the environment, and now inexpensive, glyphosate is a valuable weed management tool. How valuable? Imagine the cost of weed control if you couldn’t count on glyphosate!
Resistance–the inherited ability of a plant to survive and produce healthy seed after being sprayed with enough material to kill non-resistant plants of the same species–has developed to glyphosate in several weeds in California. These include rigid ryegrass, annual ryegrass, marestail (Horseweed), Hairy fleabane, and jungle rice. Glyphosate resistance is a...
