Beans (Adzuki, Dry, Lima and Snap): Introduction to Managing Weeds

Excerpt from 2008 Publication 75, Guide to Weed Control, Order this publication

Introduction

• Dry Beans include adzuki, black, cranberry, Dutch brown, kidney, mung, otebo, pinto, yellow eye and white bean market classes.
• All treatments should be applied in 150-300 L/ha (60-120 L/ac) water unless otherwise specified.
• When developing a weed control program, consider cultivation, rotation and other cultural practices along with herbicide treatments. Any single method of weed control, or the continuous use of the same chemical, can lead to the build up of weeds resistant or tolerant to that control method. Rotating crops and/or other control methods reduces the chance of developing new or unique weed infestations
• High speed (10-20 km/hr) shallow (2.5-3 cm) cultivation with a rotary hoe when the beans are in the 1-2 leaf stage will help to control small weed seedlings. This technique will not reduce herbicide action and may in some years enhance chemical weed control and improve crop safety.
• Inter-row cultivation may be required when weeds escape herbicide treatment; weeds should be considered as escapes when they are 5-7 cm high. Cultivation should be shallow to prevent exposure of untreated soil and germination of new weed seeds.
• Band treatment of chemical over the row will reduce costs by one-half to two-thirds, depending on the row spacing and width of band. Shallow inter-row cultivation will be required to control weeds between the bands.
• Cultivation will give some control of established perennial weeds but may also help to spread them to previously uninfested areas. Machinery sanitation is important when moving from one field to another.
• Some chemicals may also be impregnated on dry bulk fertilizer. Check the label for recommended fertilizer ingredients. Please refer to Table 7-1. Beans (Dry, Lima and Snap) Weed Control Ratings to determine which market classes of edible beans are registered for the herbicide treatments listed.
• Rates and application techniques vary for trifluralin products. For further information on these and other chemicals refer to label recommendations and also the "Notes on Chemicals" section in this publication.
• Herbicide Application Timings:
  Soil Applied Treatments include
  • Preplant (PP) - Also see Chapter 6, Special Methods: Preplant - Site Preparation for details of products, rates and remarks.
  • Preplant Incorporated (PPI) - Unless stated otherwise, 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. Cultivation-type equipment used for herbicide incorporation is known to spread perennial weeds to previously uninfested areas. Pay special attention to machinery cleanliness and/or treating 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 improve 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.

| Top of Page |

Related Links

• Weeds in Ontario
• Edible Beans
• Vegetables: Legumes, Beans and Peas
• 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

| Top of Page |