Table 6-3: Postharvest Weed Control Ratings


Pub 75: Guide to Weed Control > Preplant and Postharvest Weed Control > Table 6-3: Postharvest Weed Control Ratings

Excerpt from 2010-11 Chapter 6, Publication 75, Guide to Weed Control, Order this publication

Cover of Publication 75, Guide to Weed ControlTable of Contents

  1. Postharvest Weed Control (Crop Stubble), (Table 6-3) (PDF file - 47 kb)
  2. Other Preplant and Postharvest Weed Control Tables
    • Non-Selective Herbicides Available for Preplant Site Preparation (Table 6-1) (PDF file - 55 kb)
    • Preplant Herbicide Weed Control Ratings (Table 6-2) (PDF file - 49 kb)
  3. Other Special Methods of Weed Control
  4. Related Links
Table 6-3: Postharvest Weed Control (Crop Stubble)
Postharvest Herbicides Treatment

Quack-
grass

 Wire Stem Muhly Field Bind-weed Mouse-eared Chickweed Colt's Foot

Red Clover
glyphosate glyphosate* 9 9 9 9 8 8
dicamba Banvel II, Oracle 0 0 8 9 7 9
2,4-D 2,4-D* 0 0 7 2 - 5

Postharvest Herbicides Treatment

Dandelion

 Hemp Dogbane Milkweed Ground Cherry

Canada
thistle

Sow-thistle
glyphosate glyphosate* 8/9a 8 8 - 9 9
dicamba Banvel II 8 8 7 6 8 9
2,4-D 2,4-D* 7 - 0 - 6 7

Table 6-3. Special Notes on Weeds Controlled and Product Rates Associated with Various Glyphosate Concentrations
Glyphosate* Concentration Produce Rate/ac Weeds Controlled & Notes

360 g/L
450 g/L
480 g/L
500 g/L
540 g/L

0.3 - 1.4 L/ac
0.24 - 1.12 L/ac
0.22 - 1.05 L/ac
0.22-1 L/ac
0.2-0.93 L/ac
  • For control of annual weeds.
  • Use 50-100 L/ha (20-40 L/ac) for the low rate, or use surfactant with larger water volumes.
  • The highest rate is required for weeds over 15 cm in height.
  • For weeds smaller than 15 cm in height consult the product label for weed specific rates.
  • For actively growing weeds in the fall, or spring prior to emergence of any crop.
  • Allow 5-7 days translocation time after application before doing any tillage when conditions are good. If cool temperatures follow application, allow additional time for translocation to be completed before disturbing treated weeds.
  • Only weeds emerged at application time will be controlled
360 g/L
450 g/L
480 g/L
500 g/L
540 g/L
 1 - 2.8 L/ac
0.8 - 2.25 L/ac
0.75 - 2.1 L/ac
0.72 - 2 L/ac
0.67 - 1.87 L/ac
  • For dandelions and quackgrass.
  • Apply when quackgrass has 3-4 new leaves.
  • The low rate will provide a minimum of one season control while higher rates will provide longer term control of quackgrass.
  • For dandelions, apply the low rate if smaller than 15 cm in diameter and higher rates if greater than 15 cm in diamete
360 g/L
450 g/L
480 g/L
500 g/L
540 g/L		 2.8 - 4.8 L/ac
2.25 - 3.85 L/ac
2.1 - 3.6 L/ac
2 - 3.5 L/ac
1.87 - 3.2 L/ac
  • For perennial broadleaf weeds.
  • Canada thistle and sow thistle should be at least in early bud, milkweed at bud, bindweed at full flower and dogbane past full bloom for best results.
  • For undisturbed perennials (such as in sod or non-crop areas) use the highest rate and repeat when the plants re-grow to the optimum growth stages mentioned above

- Insufficient information available to make a rating.
* Various products available, see Table 4-1, Herbicides Used in Ontario.
a Use higher rates for plants over 15 cm tall or across.

Related Links

 


For more information:
Toll Free: 1-877-424-1300
Local: (519) 826-4047
E-mail: ag.info.omafra@ontario.ca
Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 30 January 2010