Water Primrose, Floating (ssp. montevidensis) (Ludwigia peploides ssp. montevidensis) on Dec 3, 2013

Originally reported as Water Primrose (unknown species) (Ludwigia spp.)

Submitter does not have a specimen
EDRR Status: Ongoing monitoring

Description of specimen

Ludwigia peploides ssp. montevidensis, confirmed by Brenda Grewell of UC Davis. It was first sighted at Smith-Bybee nearly 10 years ago. In the last 5 years it's spread considerably through the natural area. We have treated much of the Bybee Lake infestation after seasonal drying of the wetlands. It remains vulnerable for a time, still growing, and responds well to 3 percent glyphosate with 1 percent surfactant. However, Smith Lake does not fully draw down and we are not ready to attempt aquatic applications to Ludwigia.

Commentary

I have several images but cannot get that link to work, so they are not uploaded for you.

Reporter
Dec. 3, 2013, 12:43 a.m.