Brittle Naiad Identification & Treatment
Scientific Name: Najas minor Category: Submerged Tier: 2 — Regionally Significant — Invasive in some areas
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Identification
Brittle naiad has thin, delicate leaves with toothed margins that break apart very easily when handled — hence the name. Stems are slender and branching. Distinguished from Southern Naiad by its extremely fragile stems and more strongly toothed leaf margins. Key distinguishing features:
- Very fragile stems that break easily when touched
- Thin leaves with strongly toothed/serrated margins
- Opposite leaf arrangement
- Bushy, branching growth pattern
Commonly confused with: Southern Naiad (sturdier, less toothed margins), Elodea (whorled leaves vs. opposite)
Treatment
Brittle naiad can spread rapidly by fragmentation — broken stem pieces root and establish new colonies. Treatment should minimize mechanical disturbance.
- Aquathol K or Aquathol Super K (endothall) — Contact herbicide for effective knockdown.
- Sonar A.S. (fluridone) — Systemic option for larger infestations.
- Hydrothol Granular (endothall) — Granular formulation for targeted bottom treatment.
Important: Mechanical removal can worsen infestations by creating more fragments. Chemical control is preferred.
Full Profile
- Native Range: Europe, Asia, Africa
- US Distribution: Eastern and central United States, expanding. USDA Zones 5–10.
- Regulatory Status: Considered invasive in several states.
- Habitat: Ponds, lakes, and slow-moving streams. Tolerates a range of water clarity.
- Reproduction: Primarily by fragmentation and seed.
- Ecological Benefits: Minimal. Provides some cover for small fish but generally displaces more valuable native species.
Sources: Texas A&M AquaPlant | USDA PLANTS Database | USGS NAS
Related Species
- Southern Naiad (Najas guadalupensis) — Submerged, Tier 2
- Elodea (Elodea canadensis) — Submerged, Tier 1
- Hydrilla (Hydrilla verticillata) — Submerged, Tier 1
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