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Table 18-2. Classification of Weeds According to Response to Various Foliage Sprays

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 25 June 2008
Cover of Publication 75, Guide to Weed Control
Pub 75: Guide to Weed Control > Water Weeds > Table 18-2. Classification of Weeds According to Response to Various Foliage Sprays

Excerpt from Chapter 18, 2008 Publication 75, Guide to Weed Control, Order this publication

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| A | B | C | D | E | F | G | H | K | L | M | N | P | R | S | T | V | W | Y |

Common Name
 2,4-D MCPA 2,4-DB or MCPB Mecoprop Dicamba
aster (perennial)
 I        
bedstraw (perennial)
 R I-R R I R
bellflower (perennial)
 R        
bindweed, field (perennial)
 I I I I S-I
blueweed (biennial)
 S-I I   I I
bracken fern (perennial)
 R R R R I
I-R I I-R I-R S
burdock (biennial)
 S S I   S
buttercup (perennial)
 I-R S-I I**(I-R) I I
R R R R  
carrot, wild (biennial)
 S-R S-R R I-R S
R R R R  
catnip (perennial)
 S-I        
I-R I R S S
I-R I-R R S S
chicory (perennial)
 S S-I S-I*(R) I-R S
cinquefoil, rough (winter annual)
I        
cinquefoil, sulphur (upright c.), (perennial)
 I        
cocklebur (annual)
 S S S S S
I-R R R   I
cockle, white (perennial)
 R   I-R   I
daisy, ox-eye (perennial)
 I I R I I
dandelion (perennial)
 S S I*(R) I S
dock (perennial)
 I I I I  
S        
false flax (winter annual)
 S S S S S
fleabane, annual (daisy f.) (winter annual)
 I I S-I    
S-I        
goat's-beard (biennial)
 I        
golden rod (perennial)
 I R I I  
goosefoot (annual)
 S S S S  
goutweed (perennial)
 R R R R  
grasses (annual and perennial)
 R R R R  
ground-ivy (Creeping Charlie) (perennial)
I-R I-R   I S
groundsel (annual)
 I I      
hawkweed (perennial)
 I-R I-R     S-I
heal-all (perennial)
 I-R I-R I-R S S
hemp-nettle (annual)
 R S-I I-R**(R) R  
horse-nettle (perennial)
 R       I
horse-tail (perennial)
 I-R S-I I-R I-R I
knapweeds (perennial)
 R   I*(I-R)   I
knotweed (annual)
 I-R   I-R*(R) S-I S
S-I I-R S I-R S
S S S S S
S-I S I-R S  
mallow, round-leaved (perennial)
 I-R I-R R I-R  
mayweed (annual)
 I-R   I   S
medick, black (winter annual)
 I I   S I
milkweed (perennial)
 R R R I-R I-R
motherwort (perennial)
 S-I        
mullein (biennial)
 I-R        
mustards (annual)
 S S I S  
nightshade (perennial)
 I-R     R  
parsnip, wild (biennial)
 S        
pepper-grass, common (winter annual)
 S S-I I    
pepper-grass, field (winter annual)
 S S I    
pigweeds (annual)
 S I S-I S S
S   R R  
plantains (perennial)
 S S S-I S-I I
purslane (annual)
 I I S-I S-I  
ragweed (annual)
 S S S S S
ragwort (biennial and perennial)
 I-R R R I S-I
ribgrass (see plantains) (perennial)
         
rocket, yellow (biennial)
 S I I*(R)    
sheperd's purse (winter annual)
 S-I S S-I S-I  
S-I I-R I-R I-R S
sorrel, sheep (perennial)
 I R      
S I S-I I S-I
I R S-I*(I-R)   S-I
speedwells (annual and perennial)
 I-R I-R   S-I I
spurge, cypress (perennial)
 I-R I-R I-R   I
spurge, leafy (perennial)
 I-R I-R I-R R S
spurry, corn (annual)
 R I R I R
St. John's wort (perennial)
 R R R R S
stinkweed (pennycress) (winter annual)
 S S S-I S-I  
I I   S-I  
teasel (biennial)
 S        
thistle, bull (biennial)
 S S S S S-I
thistle, Canada (perennial)
 I I I I  
I   I   S-I
S-I   I-R R  
toadflax (perennial)
 R R R R S-I
velvetleaf (annual)
 S-I I S-I*(I-R)   I
vetch (perennial)
 I-R I-R R I-R I
vetches, wild (annual)
 S S      
violet, field (field pansy) (annual)
R     R  
water-hemlock (perennial)
 S-I        
wood-sorrel (perennial)
 I-R        
yarrow (perennial)
 R I-R   I-R I-R

* - 2,4-DB more effective (susceptibility to MCPB in brackets)
** - MCPB more effective (susceptibility to 2,4-DB in brackets)
S - Susceptible. Killed by one application of 2,4-D, MCPA or Mecoprop (1.2 kg or less per ha); or by one application of dicamba (425 g or less per ha).
I - Intermediate. Killed less rapidly by controlled by higher rates or by repeated applications.
R - Resistant. Not affected or only slightly damaged by chemical treatment. Control of this weed is not practical with herbicides(s) listed at the top of this column.

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