Guide to Weed Control in Potatoes

 
 
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 Weed control in potatoes is becoming more of a challenge with each passing year. Wherever possible, pests should be managed throughout an entire rotation, not just in the current growing season.

If there is a problem in the current season, managing that pest in another crop in a following year, if at all possible, may be the best management practice. Certain weeds such as wild buckwheat, Canada thistle and perennial sow thistle are examples of such problem pests.

The table below shows herbicides registered for use on potatoes in Canada. Note that some herbicides are not registered for use on potatoes in the United States and should not be used on consumable product destined for export. Most processing companies have their own list of approved chemicals that may be used on their respective contracted acres.

The information in Table 1 is based on available product information. The “S” indicates suppression only, whereas “P” indicates partial control. The weed species that are controlled will vary with the rate of product applied.

For details on rates, varietal restrictions, additional weeds controlled, re-cropping restrictions, timing and mixing instructions, please refer to the product label.

Table 1. Herbicides registered for use on potatoes
Weeds controlled
Herbicide
Common name
PHI (pre-harvest interval)
Barnyard Grass
Green Foxtail
Kochia
Lamb’s quarters
Mustards
Quack-
grass
Redroot Pigweed
Canada Thistle
Smartweeds
Volunteer Cereals
Wild Buckwheat
Wild Oats
ClethodimSelect
60
S
Centurion
60
S
Arrow 240
60
S
Chlorthal*Dacthal W-75
Diclofop-methyl*Hoe-Grass 284*
60
DiquatReglone
14
Non-selective for green vegetation – vine kill
EPTCEptam 8E
45
Fenoxaprop-f-ethyl*Excel Super
35
Fluazifop-p-butyl*Venture L
90
GlyphosateWide range of products (e.g. Roundup)
MetribuzinSencor (various)
60
Lexone
60
ParaquatGramoxone
30
Kills top growth of most weeds
RimsulfuronPrism
30
S
SethoxydimPoast Ultra
80
S-MetolachlorDual II Magnum
S
LinuronLinuron
Lorox
P
Glufosinate AmmoniumLiberty
14 - 21
S
S
*Herbicides not registered for use in potatoes in the United States
The information in this factsheet is intended as a guide only. Every effort has been made to ensure accuracy; however, it remains the responsibility of the reader to follow information on the product label.

Source: Agdex 258/642–1. Revised April 2007.
 
 
 
 
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For more information about the content of this document, contact Ag Info Centre.
This information published to the web on January 1, 2002.
Last Reviewed/Revised on April 1, 2007.