Soybeans: Introduction

Introduction

• Unless otherwise specified, apply all treatments in 150-300 L/ha (60-120 L/ac) water.
• Thoroughly clean all equipment used to apply Accent, Accent Total, Banvel II, Battalion, Distinct, Lontrel, Marksman, MCPA, Oracle, Peakplus, Shotgun, 2,4-D and other related herbicides immidiately after use, as well as before spraying soybeans. See "Cleaning the Sprayer" section.
• Total Weed Control System - Although herbicides themselves may be effective, there is a benefit to using all the weed control methods available to obtain the best control possible. Crop rotation, herbicide rotation, early weed control with a rotary hoe, harrowing, cultivating and preventing the spread of weeds as much as possible are all a part of weed management. See the corn section for some details of each of these methods.
• Resistant Weeds - Biotypes of a number of weeds have been found resistant to Group 5 (triazine) and Group 2 herbicides. Refer to the section "Managing Weed Resistance to Herbicides" for management and control strategies.
• Specific Weeds - For information on specific weeds see the Conventional Soybean Herbicide Weed Control Ratings Table. Then refer to the appropriate section for details about herbicide treatments.
• HerbicideTreatments include:
  • Preplant (PP) - See Preplant Weed Control, Preplant-Site Preparation Prior to Any Crop for details of products, rates and remarks.
  • Preplant Incorporated (PPI) - Two incorporations at right angles operating at a depth of 10 cm using a double disk (7-10 km/hr) or vibrating shank S-tine cultivator (10-13 km/hr) are required unless otherwise stated. Cultivation-type equipment used for herbicide incorporation is known to spread perennial weeds to previously uninfested areas. Ensure machines are clean and/or treat fields with perennial weeds last.
  • Preemergence (PRE) - Rainfall of 15-20 mm within 10 days after application is necessary to activate preemergence treatments. Shallow cultivation, rotary hoeing or harrowing will control weed escapes and improves herbicide activity in the absence of rainfall.
  • Postemergence (POST) - Leaf stage of the weeds is critical for good weed control. Smaller weeds are usually more sensitive to herbicide injury. Apply according to recommended leaf stages. Crop stage is important to optimize crop safety. Adjuvants will frequently improve the weed control when used as directed. Weather or other conditions may influence the optimum rate of adjuvant, see the product label for more details. Always use appropriate drift management technology.

Related Links

• Weeds in Ontario
• Soybeans in Ontario
• Problem Weed Control in Field Crops
• Integrated Pest Management (IPM)
• Pesticide Application and Safety
• Pesticide Companies and Agents
• OMAFRA Sprayer Calibration Calculator
• Search the PMRA website
• OMAFRA Publication 505: Ontario Weeds
• OMAFRA Publication 75: Guide To Weed Control