CDFA “A” Rated Weeds Considered Eradicated from County
We are continually being threatened by the introduction of new weed species, once a weed had reached a certain level of infestation, eradication becomes difficult or impossible. The goal of an exclusion program is to detect the introduction of a weed or other potentially harmful species before it reached unmanageable populations. A number of noxious weeds have been detected under this program and successfully eradicated:
Noted in 1964 at the Carmel Mission infesting a portion of the Cemetery.
No concerted effort was made to eradicate it until 1980; when County staff visited the Mission and noted the infestation still there. Since that time, regular visits to the Mission have been made to mechanically control the toadflax--use of chemicals was not permitted by the Mission.
Over the years there have been several sightings of the weed in different locations of the County. In each instance, the plant or group of plants was removed by methods including Tordon, RoundUp, use of a shovel, and hand pulling
Found by County staff along San Benancio Rd. in 1978, while doing an entryway survey. A couple of rosettes of the weed were stumbled upon on the shoulder of the road while sweeping the vegetation for insects. The plants were dug out by shovel.
Surveys of the immediate area failed to detect additional plants and subsequent surveys were negative.
It is speculated that the seeds may have blown off a vehicle carrying hay, livestock, or beehives from a contaminated area.
In 1999, a single plant was detected by BLM staff at Ft. Ord. along Barloy Cyn. Rd. near the Merrill Ranch. The plant was removed. This find may be evidence that an as yet undetected infestation of spotted knapweed might exist in the Corral de Tierra-Ft. Ord area.
Detected by County staff in 1988 while doing an entryway survey with a State biologist on Hwy 101 between San Lucas and San Ardo.
Delimiting surveys determined that the infestation was limited to one side of the highway, extending for a distance of about 100 ft. The plants were treated with herbicide.
For the next several years, new plants were shoveled out or treated with Roundup. After several additional years of surveys were made with negative findings, the infestation was declared to be eradicated.