Presentation on the invasive curly leaf pondweed.

1. Curly Leaf Pondweed
5/16/2012
Managing Aquatic Resources Since 1966

2. Aquatic Invasive Species
 Curly Leaf Pondweed
 Scientific Name: Potamogeton crispus L.
 Common Names: Curly Leaf Pondweed, Crisp Pondweed,
Crimped Pondweed or Curled Pondweed

3. Distribution
 Native to Eurasia, Australia,
and Africa
 Colonized Northeast United
States in Mid 1800’s
 Was present in Midwest
ponds and lakes by 1930’s
 Currently found in all
continental states except
Maine and S. Carolina

4. Description/Identification
 Alternate two ranked leaves
 Crisp textured leaves
 Leaf margins are wavy and
toothed
 Distinct mid-vein
 Highly reduced flowers on aerial
spikes
 Produce turions

5. Life Cycle Biology
 Cold/Cool water plant
 Active growth in winter
 Maximum density in late spring
 Falls dormant in early/mid summer

6. Life Cycle Biology
 Reproduces by turions, seeds, fragmentation, and
rhizomes
 Forms turions in late spring
 Germination of turions is very high
 Turions remain viable for several years

7. Dispersal Mechanisms
 Boats, trailers, and other human assistance
 Waterfowl
 Currents

8. Impacts
 Reduced recreational activities
 Decrease in property value
 Disrupt navigation
 Trigger algae blooms in
summer
 Trigger dissolved oxygen
depressions

9. Viable Management
Techniques/Control Options
 Education/Prevention
 Physical Removal?
 Biological?
 Chemical Control

10. Chemical Control
 Early Treatments
 Endothol
 Aquathol
 Aquathol Super K
 Fluridone
 Sonar AS
 Sonar Q
 Diquat
 Reward
 Weedtrine

11. Chemical Control Endothol
 Aquthol K: For whole lake treatments use 0.75 – 3.0 ppm
(0.45 - 1.9 gallons per acre foot). For partial lake trements
use 1.5 – 5 ppm (1.0 – 3.2 gallons per acre foot).
 Aquathol Super K: For whole lake treatment use 0.75 –
1.5 ppm (3.3 – 6.6 lbs. per acre foot). For partial lake
treatments use 1.5 – 5 ppm (6.6 – 22.0 per acre foot).
 Best results in early to mid spring when water
temperatures are between 55 and 70 degrees F.

12. Chemical Control Fluridone
 Sonar A.S. Aquatic Herbicide: Whole lake treatments only
at 20 – 30 ppb total product application
 Sonar Q Aquatic Herbicide: Whole lake treatments only at
20 – 30 ppb total product application
 Perform FasTEST to confirm treatment concentration
 Early treatments most effective. Has shown excellent
results in winter applications as a preventative in isolated
cases. Do not use once the plants are mature and forming
turions.

13. Chemical Control Diquat
 Reward: Use 1 - 2 gallons of Reward per acre of
vegetation.
 Weedtrine D: Use 5 – 10 gallons Weedtrine D per acre of
vegetation
 Best results in early to mid spring when water
temperatures are between 55 and 70 degrees F.

14. Questions?
Managing Aquatic Resources Since 1966