2004 Weed Control Guide for Field Crops

Weed Control Guide for Field Crops cover

MSU Extension Bulletin E-434

Printed Bulletin Revised November 2003

By Christy L. Sprague, James J. Kells, Kathrin Schirmacher

Deptartment of Crop and Soil Sciences

General Information

Cultural Control of Weeds

Chemical Control of Weeds

Herbicide Formulation and Additives

Herbicide Application

Pesticides and the Environment

SARA Title III Emergency Planning and
Community Right to Know

Restricted Use Pesticides

Herbicide Resistance in Weeds

Herbicide Mode of Action

Pesticide Emergency Information

Crops

Tables

Table 8 — Chemical Weed Control in Forage Sorghum
Table 9 — Weed Response to Non-Selective Herbicides
Table 10 — Glyphosate Products Registered
for Postemergence Application in
Roundup Ready Crops.
Table 11 — Rainfree Period for Postemergence Herbicide Applications
Table 12 — Herbicide Crop Rotation Restrictions
Table 13 — Toxicity, Solubility, Adsorptivity,
and Persistence of Herbicides
Table 14 — Glossary of Chemical Names
Table 15 — Glossary of EPA Registration Numbers

Weed Competition in Roundup Ready Soybeans and Corn

Field Crop Advisory Team Alert Newsletter Information

Pesticides must be registered with the U.S. Environmental Protection Agency and the Michigan Department of Agriculture before they can be legally used in Michigan. This bulletin suggests using pesticides in the management of crop pests. Purchase only those pesticide products labeled for 1) the crop you wish to use it on and 2) the pest you wish to manage on that crop. Remember, the pesticide label is the legal document on pesticide use. The label must be read carefully and all instructions and limitations followed closely. The use of a pesticide in a manner not consistent with the label can lead to the injury of crops, humans, animals, and the environment, and also lead to civil fines and/or condemnation of the crop. Pesticides are management tools for the control of pests in crops but only when they are used in an effective, economical, and environmentally sound manner.

See pesticide emergency information under General Information

Chemical control header

IMPORTANT: READ THE FOLLOWING BEFORE USING

Rates are expressed in pounds of active ingredient (a.i.) per acre for the area actually sprayed; rates in formulation column are given as pounds or ligquid measure of product unless otherwise noted.
(NOTE: Commercial rates are expressed in pt or qt or gal or lb or oz).
Apply all agricultural chemicals in accordance with regulations and lablesl as to rates, timing and crops for which they may be used.
Rates recommended in this bulletin are for medium-textured soils with 3% organic matter.
Many herbicides may also be applied as granules or impregnated on dry fertilizer. With these application methods, uniform application of the herbicide is necessary for acceptable weed control.
For incorporated herbicides the recommended mixing depth is 1 to 2 inches.

This publication contains pesticide recommendations based on research and pesticide rgulations. However, changes in pesticide regulations occur constantly. Some pesticides mentioned may no longer be availabe, and some uses may no longer be legal. If you have questions about the legality and/or registration status for using pesticides, contact your county MSU Extension office.

To protect yourself and others and the environment, alwyas read the label before applying any pesticide.

MSU Extension
Michigan Agricultural Experiment Station
College of Agriculture and Natural Resources