Curly Leaf Pondweed 5/16/2012

Managing Aquatic Resources Since 1966

Aquatic Invasive Species Curly Leaf Pondweed Scientific Name: Potamogeton crispus L. Common Names: Curly Leaf Pondweed, Crisp Pondweed,

Crimped Pondweed or Curled Pondweed

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

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

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

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

Dispersal Mechanisms Boats, trailers, and other human assistance Waterfowl Currents

Impacts Reduced recreational activities Decrease in property value Disrupt navigation Trigger algae blooms in

summer Trigger dissolved oxygen

depressions

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

Chemical Control Early Treatments Endothol

Aquathol Aquathol Super K

Fluridone Sonar AS Sonar Q

Diquat Reward Weedtrine

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.

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.

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.

Questions?

Managing Aquatic Resources Since 1966