Herbicide Recommendations for Beans:
Preharvest

Pub 75: Guide to Weed Control > Beans > Preharvest

Excerpt from 2010-11 Publication 75, Guide to Weed Control, Order this publication

Table 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)
   • Annual Grasses
   • Annual Broadleaf Weeds
   • Perennial Weeds
6. Other Bean Weed Control Recommendations
• Soil Applied Grass Herbicides
• Soil Applied Grass and Broadleaf Herbicides
• Soil Applied Tank-Mixes
• Postemergence Grass Herbicides
• Postemergence Broadleaf Herbicides
• Postemergence Tank-Mixes
7. Related Links

Aim EC + non-ionic surfactant or Merge

Trade Name	Aim EC	+ 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*	or glyphosate*
Active Ingredient	glyphosate*	or glyphosate*	or glyphosate*	or glyphosate*	or glyphosate*
Formulation	360 g/L	450 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	0.9 kg/ha
Rate per hectare (product)	2.5 L/ha	2 L/ha	1.88 L/ha	1.8 L/ha	1.67 L/ha
Rate per acre (product)	1 L/ac	0.8 L/ha	0.75 L/ac	0.72 L/ac	0.67 L/ac

* See Table 4-1, Herbicides used in Ontario, page 23 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	Ignite
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 hours 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

• Weeds in Ontario
• Edible Beans
• Vegetables: Legumes, Beans and Peas
• Problem Weed Control in Field Crops
• Pesticide Companies and Agents
• OMAFRA Sprayer Calibration Calculator
• Search the PMRA website
• OMAFRA Publication 505: Ontario Weeds
• OMAFRA Publication 75: Guide To Weed Control