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Table 19-1. Habitats and Herbicide Susceptibility of Common Aquatic Plants

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 25 June 2008

Pub 75: Guide to Weed Control > Water Weeds > Table 19-1. Habitats and Herbicide Susceptibility of Common Aquatic Plants

Excerpt from Chapter 19, 2008 Publication 75, Guide to Weed Control, Order this publication

Cover of Publication 75, Guide to Weed ControlTable of Contents

  1. Occurence of Water Weeds (Aquatic Plants) in Various Bodies of Water
  2. Mechanical and Chemical Control Ratings
  3. Water Weeds (Aquatic Plants) Control Herbicide Rating Tables
    • Habitats and Herbicide Susceptibility of Common Aquatic Plants
      (Table 19-1) (PDF 80kb)
    • Classification of Weeds According to Response to Various Foliage Sprays
      (Table 18-2) (PDF 62kb)
  4. Related Links
Occurence of Algae Species in Various Bodies of Water: Algae
Algae
 Spring-fed Pond Dugout Soft Water Lake* Hard Water Lake** Wet Ditch*** Dry Ditch***
Spirogyra spp.
 VC VC C-I   VC I
Ulothrix spp.
 C VC     VC  
Mougeotia spp.
 C VC     VC  
Cladophora spp.
 VC VC C VC VC VC
Chara spp. (Muskgrass)
 VC I C-I VC-I VC R
Nitella spp. (Stonewort)
 I R VC R R R
VC - very common; C - common; I - infrequent; R - rare
* - A typical Muskoka lake is an example of a soft water lake.
** - A typical Kawartha lake is an example of a hard water lake.
*** - A wet ditch contains water at time of treatment.
**** - A dry ditch contains no water at time of treatment.

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Occurence of Submergent Macrophytes in Various Bodies of Water: Submergent Macrophytes
Submergent Macrophytes
 Spring-fed Pond Dugout Soft Water Lake* Hard Water Lake** Wet Ditch*** Dry Ditch***
Sago pondweed (P. pectinatus)
 I C-I   VC    
Curly-leaf pondweed
(P. crispus)
 C VC   VC    
Bassweed
(P. amplifolius)
 R C   C    
Richardson pondweed
(P. richardsonii)
       VC-C    
Flat-stemmed pondweed
(P. zosteriformis)
       C    
other narrow-leaf pondweed (potamogeton spp.)
 I C C VC-C    
Eurasian water milfoil (Myriophyllum spicatum)
     VC      
Native milfoil (M. exalbescens and others)
 C   C VC    
Bladderwort (Utricularia vulgaris)
   C   C    
Coontail (Ceratophyllum demersum)
   C   VC    
Water stargrass (Heterantheria dubia)
       C    
Tape grass (Vallisneria americana) (M**)
 R I C VC R R
Water naiad (Najas flexilis)
   I   VC    
Canada water weed (Elodea canadensis)
   C   VC    
VC - very common; C - common; I - infrequent; R - rare
* - A typical Muskoka lake is an example of a soft water lake.
** - A typical Kawartha lake is an example of a hard water lake.
*** - A wet ditch contains water at time of treatment.
**** - A dry ditch contains no water at time of treatment.

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Occurence of Emergents in Various Bodies of Water: Emergents
Emergents
 Spring-fed Pond Dugout Soft Water Lake* Hard Water Lake** Wet Ditch*** Dry Ditch***
Cattails (T. latifolia, T. angustifolia)
VC VC   VC VC I-C
Bulrush (Scirpus spp.)
    C VC C C
Sedge (Carex spp+A42)
    C C C VC
Bur reed (Sparganium spp.)#
 C   C C C VC
Water plantain (Alisma spp.)
     I C C VC
Pipewort (Eriocaulon spp.) (
 R R C R R R
Arrowhead (Sagittaria spp.)
   C   VC I-C  
Pickerelweed (Pontederia spp.)
     VC   I R
Water smartweed (polygonium amphibium)
 I I        
Water shield (Brasenia spp.)
     C      
White water lily (Nymphaea spp.)
    C C    
Yellow water lily (Nuphar spp.)
  C-I C C    
Duckweed (Lemna spp.)
 R C I-R VC    
Duckmeal (Wolffia spp.)
 R C-I I-R VC    
VC - very common; C - common; I - infrequent; R - rare
# Bur reed is also very common as a submerged plant in ecotypes C and D.
* - A typical Muskoka lake is an example of a soft water lake.
** - A typical Kawartha lake is an example of a hard water lake.
*** - A wet ditch contains water at time of treatment.
**** - A dry ditch contains no water at time of treatment.

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Mechanical and Chemical Control Ratings for Algae
Algae
 Mechanical control copper compound
(Polydex)		 diquat
(Reward)		 amitrole (Amitrol 240)
Pithophora
 ?      
Spirogyra spp.
 ? S R  
Ulothrix spp.
 ? S R  
Mougeotia spp.
 ? S R  
Cladophora spp.
 ? S R  
Chara spp. (Muskgrass)
 ? S R  
Nitella spp. (Stonewort)
 ? S R  
S - susceptible; I - intemediate; R - resistant
? - no information available

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Mechanical and Chemical Control Ratings for Submergent Macrophytes
Submergent Macrophytes
 Mechanical control copper (Polydex) diquat (Reward) amitrole (Amitrol 240)
Sago pondweed (P. pectinatus)
 ? R S  
Curly-leaf pondweed
(P. crispus)
 ? R S  
Bassweed
(P. amplifolius)
 ? R I  
Richardson pondweed
(P. richardsonii)
 ? R S-I  
Flat-stemmed pondweed
(P. zosteriformis)
 ? R S  
other narrow-leaf pondweed (potamogeton spp.)
 ? R S  
Eurasian water milfoil (Myriophyllum spicatum)
 ? R VS  
Native milfoil (M. exalbescens and others)
 ? R VS  
Bladderwort (Utricularia vulgaris)
 ? R S-I  
Coontail (Ceratophyllum demersum)
 ? R I  
Water stargrass (Heterantheria dubia)
 ? R S-I  
Tape grass (Vallisneria americana)
M** R R R
Water naiad (Najas flexilis)
 ? R S  
Canada water weed (Elodea canadensis)
 ? R I  
S - susceptible; I - intemediate; R - resistant
M - manual or mechanical methods equally as effective as herbicides
M* - manual or mechanical methods are generally more effective than herbicides
M** - manual or mechanical methods are the only control measure current available
? - no information available

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Mechanical and Chemical Control Ratings for Emergents
Emergents
 Mechanical control copper
(Polydex)		 diquat (Reward) amitrole
(Amitrol 240)
Cattails (T. latifolia, T. angustifolia)
M R R S-I
Bulrush (Scirpus spp.)
M R   S-I
Sedge (Carex spp+A42)
M R   S-I
Bur reed (Sparganium spp.)
M R   I
Water plantain (Alisma spp.)
 ? R   S
Pipewort (Eriocaulon spp.)
M* R    
Arrowhead (Sagittaria spp.)
 ? R    
Pickerelweed (Pontederia spp.)
 ? R    
Water smartweed (polygonium amphibium)
 ? R    
Water shield (Brasenia spp.)
 ? R    
White water lily (Nymphaea spp.)
M* R    
Yellow water lily (Nuphar spp.)
M* R    
Duckweed (Lemna spp.)
 ? R S  
Duckmeal (Wolffia spp.)
 ? R S  
S - susceptible; I - intemediate; R - resistant
M - manual or mechanical methods equally as effective as herbicides
M* - manual or mechanical methods are generally more effective than herbicides
M** - manual or mechanical methods are the only control measure current available
? - no information available

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