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Egeria

General Infomation

A perennial submersed plant introduced from Brazil. Often sold as an aquarium plant despite its invasiveness.

Biological Control

Biological Control of Aquatic Weeds with Triploid Grass Carp

Most rooted and free-floating submersed weeds in ponds are readily controlled with triploid grass carp; control may be poorer on the watermilfoils, particularly Eurasian waterfoil.

Good to Excellent

Chemical Control

Herbicide, Formulation and Mode of Action Code
Amount of Formulation
Active Ingredient Rate or Concentration
Herbicide, Formulation and Mode of Action Code

2,4-D granular (Navigate) 20 G, MOA 4

Amount of Formulation

100 to 200 lb/ surface acre

Active Ingredient Rate or Concentration

20 to 40 lb/acre

Precaution and Remarks

Rate depends upon weed to be controlled and depth of water. Check labels for species and rates. Apply uniformly with a rotary seeder.

Herbicide, Formulation and Mode of Action Code

bispyribac (Tradewind) 80% MOA 2

Amount of Formulation

See label

Active Ingredient Rate or Concentration

10 to 45 ppb

Precaution and Remarks

Controls hydrilla, sago pondweed, and Eurasian watermilfoil. Do not apply in areas of high water flow or water diffusion. Refer to label for specific details on application rate based on water volume.

Herbicide, Formulation and Mode of Action Code

carfentrazone (Stingray) 1.9 lb/gal MOA 4

Amount of Formulation

0.286 to 5.75 gal/acre

Active Ingredient Rate or Concentration

200 ppb

Precaution and Remarks

Controls Eurasian watermilfoil. Apply in spring or early summer as a subsurface application or with an appropriate adjuvant to ensure sinking and mixing of the spray mix.

Herbicide, Formulation and Mode of Action Code

diquat (Reward) 2 lb/gal MOA 22

Amount of Formulation

1 to 2 gal/ surface acre

Active Ingredient Rate or Concentration

2 to 4 lb/acre

Precaution and Remarks

Weeds controlled: bladderwort, coontail, elodea, naiads, pond weeds. Apply early in season by pouring directly into water in strips 40 feet apart. Later in season, as weeds reach surface, pour in strips 20 feet apart or inject a dilute solution. Not effective in muddy water.

Herbicide, Formulation and Mode of Action Code

endothall (Aquathol K) 4.2 lb/gal (Aquathol Super K) 63 G

Amount of Formulation

0.3 to 2.6 gal/acre ft 2.2 to 17.6 lb/acre ft

Active Ingredient Rate or Concentration

0.5 to 5 ppm

Precaution and Remarks

Weeds controlled: bass weed, bur reed, coontail, hydrilla (Aquathol K only), pondweeds, watermilfoil, water star grass. Rate depends upon weed species and type of treatment. Spot or marginal treatments require higher rates. Aquathol Granular is especially useful for spot or marginal treatments.

Herbicide, Formulation and Mode of Action Code

flumioxazin (Clipper) 51% MOA 14

Amount of Formulation

See label

Active Ingredient Rate or Concentration

100 to 400 ppb

Precaution and Remarks

Early morning applications may be more effective. If vegetation is dense, treat in sections to avoid reducing dissolved oxygen. Water pH greater than 7.5 will reduce effectiveness.

Herbicide, Formulation and Mode of Action Code

fluridone (Sonar) AS MOA 12 (Sonar SRP) MOA 12

Amount of Formulation

Ponds: 0.16 to 1 qt/acre Lakes: 0.2 to 4 qt/acre Canals: 2 qt/acre Ponds: 3.2 to 30 lb/acre Lakes: 4 to 80 lb/acre Canals: 40 lb/acre Rivers: 40 lb/acre

Active Ingredient Rate or Concentration

0.16 to 1 lb/acre 0.2 to 4 lb/acre 2 lb/acre 0.16 to1.5 lb/acre 0.2 to 4 lb/acre 2 lb/acre 2 lb/acre

Precaution and Remarks

Do not use water for irrigation for 7 to 30 days. See label for specific irrigation precautions. Application to canals should be made only if water flow can be restricted. Warning: 30 days may be insufficient restriction if applied to small ponds and pond water will be used to irrigate very sensitive crops, such as tobacco, tomatoes, or peppers.

Herbicide, Formulation and Mode of Action Code

imazamox (Clearcast) 1 lb/gal, MOA 2

Amount of Formulation

See label

Active Ingredient Rate or Concentration

50 to 500 ppb

Precaution and Remarks

Rates vary according to target species and depth to be treated. See label for specific weeds controlled and application details.

Herbicide, Formulation and Mode of Action Code

penoxsulam (Galleon) 2 lb/gal, MOA 2

Amount of Formulation

See label

Active Ingredient Rate or Concentration

5 to 150 ppb

Precaution and Remarks

Rates vary according to target species and depth to be treated. See label for specific weeds controlled and application details.

Herbicide, Formulation and Mode of Action Code

triclopyr (Renovate 3 or OTF), MOA 4

Amount of Formulation

See label

Active Ingredient Rate or Concentration

1.5 to 6 lb/acre 0.5 to 2.5 ppm

Precaution and Remarks

Rates vary according to target species and depth to be treated. See label for specific weeds controlled and application details.

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Species Data

Habitat

A rooted plant, but can often be found broken off from the mother plant and floating. Highly invasive, and should be monitored closely.

Leaves

Linear and soft to the touch with very fine serrations on the leaf edge. The middle and upper leaves are usually found in whorls of four to six (although this can vary and is not a reliable identifying factor by itself).

Flowers

Delicate, and borne upon long petioles. The petals are white, and the centers are yellow. Flowers appear on the surface of the water during the bloom season (mid-late summer).

Stem

Circular in cross-section and slender.

Similar Species

Egeria and hydrilla can easily be confused. Egeria is more robust, and the stem is smooth and soft to the touch. Both have leaf serrations (but on Egeria they are very small and require a hand lens) and feel soft and smooth when drawn through the hand. Hydrilla leaf serrations are easily seen with the naked eye. Egeria stays green all winter, while hydrilla will die back during the winter in the Carolinas.

Aquatic Plants App

Whether you're a professional botanist or a casual nature enthusiast, the NC State University (NCSU) Aquatic Weeds app has detailed information on a wide variety of aquatic weeds to assist in identification.