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Herbicide Recommendations for Beans:
Preharvest

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 10 May 2008
Pub 75: Guide to Weed Control > Beans > Preharvest

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

Cover of Publication 75, Guide to Weed ControlTable of Contents

  1. Aim EC + non-ionic surfactant or Merge
  2. Glyphosate
  3. Ignite
  4. Reglone Desiccant + Agral 90 or Ag-Surf
  5. Beans (Adzuki, Dry, Lima and Snap) Herbicide Rating Table (Table 7-1) (PDF 92 kb)
  6. Other Bean Weed Control Recommendations
  7. Related Links

 

 Aim EC + non-ionic surfactant or Merge
Trade Name
+ non-ionic surfactant
or + Merge
Active Ingredient
carfentrazone-ethyl
+ non-ionic surfactant
or + surfactant/solvent
Formulation
240 g/L
 
 
Rate per hectare (active)
0.0175 to 0.028 kg/ha
0.25% v/v
0.1% v/v
Rate per hectare (product)
0.67 L/ha
1.75 to 2.25 L/ha
2 L/ha
Rate per acre (product)
0.27 L/ac
0.7 to 0.9 L/ac
0.8 L/ac

Precautions

  • Apply to actively growing weeds, up to 10cm
  • Coverage of weed and crop foliage is essential for control
  • Preharvest interval (PHI) is 1 day.

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Glyphosate
Trade Name glyphosate* or glyphosate* or glyphosate* or glyphosate*
Active Ingredient
glyphosate*
or glyphosate*
or glyphosate*
or glyphosate*
Formulation
360 g/L
480 g/L
500 g/L
540 g/L
Rate per hectare (active)
0.9 kg/ha
0.9 kg/ha
0.9 kg/ha
0.9 kg/ha
Rate per hectare (product)
2.5 L/ha
1.86 L/ha
1.8 L/ha
1.67 L/ha
Rate per acre (product)
1 L/ac
0.75 L/ac
0.72 L/ac
0.67 L/ac
* See Table 4-1, Herbicides used in Ontario, for formulations available. See label for specific uses and rates.

Precautions

  • Apply Preharvest when the crop is 30% grain moisture or less (yellow to brown pod colour, 80-90% leaf drop) and at least 7 days prior to harvest.
  • Do NOT use on snap beans.
  • Do NOT apply to crops grown for seed.
  • Do NOT apply by air.
  • Apply in 50-100 L/ha of water.
  • Do NOT apply if rain is expected within 6 hours after application.

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Ignite
Trade Name
Active Ingredient glufosinate ammonium
Formulation 150 g/L
Rate per hectare (active) 0.37 to 0.45 kg/ha
Rate per hectare (product) 2.5 to 3 L/ha
Rate per acre (product) 1 to 1.2 L/ac

Precautions

  • Apply Preharvest when approximately 50-75% of the bean pods have naturally changed colour from green to yellow or brown and at least 9 days before harvest.
  • Do NOT use on snap beans.
  • Do NOT apply to dry beans grown for seed.
  • Use the higher rate when the crop canopy is dense and/or there are high populations of weeds present at application.
  • Apply in a minimum of 110 L/ha (44 L/ac) of water at a pressure of 275 kPa (40 psi). Where crop canopy is dense, or weed growth is heavy, apply 170-220 L/ha (68-88 L/ac) of water.
  • Do NOT apply by air.
  • Do NOT apply if rain is expected within 4 hr. after application.

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Reglone Desiccant + Agral 90 or Ag-Surf
Trade Name Reglone Desiccant + Agral 90 or Ag-Surf
Active Ingredient
diquat
+ surfactant
Formulation
240 g/L
 
Rate per hectare (active)
0.3 to 0.55 kg/ha
0.1% v/v
Rate per hectare (product)
1.25 to 2.3 L/ha
1 L/1000 L
Rate per acre (product)
0.5 to 0.92 L/ac
1 L/1000 L

Precautions

  • Apply Preharvest when 80% natural leaf defoliation and 80% of the pods have turned yellow.
  • Do NOT use on lima or snap beans.
  • Avoid regrowth by targeting spray within 7 days of bean variety maturity date and harvest 5-7 days after application.
  • Use 1.25 to 1.7 L/ha by ground and 1.7 to 2.3 L/ha for aerial applications.
  • Use a minimum of 225 L/ha of spray volume.
  • Use the higher rate for heavy canopy of crop or weeds.
  • Do NOT apply if rain is expected within 15 minutes after application.

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Related Links

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