Glyphosate-Induced Weed Shifts

Composition and abundance of weed populations often change in response to new or extensively used weed management practices. Glyphosate-resistant (GR) technology is one such weed management practice now used extensively. A recent survey of weed scientists was conducted to address weed shifts in GR c...

Full description

Saved in:
Bibliographic Details
Published in:Weed technology 2006-04, Vol.20 (2), p.277-281
Main Author: CULPEPPER, A. Stanley
Format: Article
Language:English
Subjects:
Agricultural management
Biological and medical sciences
Chemical control
Conservation tillage
Corn
Cotton
Crop economics
Fundamental and applied biological sciences. Psychology
Herbicides
Parasitic plants. Weeds
Phytopathology. Animal pests. Plant and forest protection
Soybeans
Technology
Weed control
Weeds
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Composition and abundance of weed populations often change in response to new or extensively used weed management practices. Glyphosate-resistant (GR) technology is one such weed management practice now used extensively. A recent survey of weed scientists was conducted to address weed shifts in GR corn, cotton, and soybean. Twelve scientists in 11 states responded to the survey. Averaged over estimates from scientists, GR corn, cotton, and soybean were planted on 15, 90, and 88% of the hectarage in 2003, respectively. Acreage of GR corn is expected to rise, whereas only minor changes in acreage of GR cotton or soybean are expected. Weed shifts have not been observed in GR corn but have occurred in GR cotton and soybean. In GR cotton, Amaranthus, Commelina, Ipomoea, and Cyperus species as well as annual grasses were noted as becoming more problematic. Similar to cotton, Ipomoea and Commelina species are becoming more troublesome in GR soybean. In addition, in GR soybean, various winter annuals, lambsquarters species, and waterhemp species were noted as becoming more problematic. All scientists felt that weeds shifts were occurring, and two-thirds of these scientists noted that weed shifts are currently of economic concern. The scientists recommend the following to help manage weed shifts: additional herbicides in mixture with glyphosate, rotation to herbicides other than glyphosate, rotation to non-GR crops, and greater use of soil-applied herbicides.
ISSN:0890-037X
1550-2740
DOI:10.1614/WT-04-155R.1