ACS Habitat Management was responsible for the removal of invasive plant species and the native plant re-vegetation of selected areas within the Carlsbad Hydrologic Unit, comprised of seven watershed districts in northern San Diego County.† Roughly 278 acres of various non-native invasive plant species were controlled, primarily in the riparian zones of these watersheds.† These species included arundo, tamarisk, pampas grass, palms and various other riparian invasives.

 

 

Restoration of Riparian Habitat in the Carlsbad Hydrologic Unit

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© ACS Habitat Management†††† (A Division of AgriChemical & Supply, Inc.)††† 2002 Oceanside Blvd., Oceanside, CA 92054

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Both chemical and mechanical control and removal methods were utilized in the completion of this project.† Coordination with land owners to gain right of entry was the responsibility of ACS Habitat Management.† The company was also active in public outreach to inform landowners of the negative impact non-native plants have on the watershed ecosystem and the benefits of the project.

Above: A stream bank after a massive arundo infestation has been treated and removed.† Right:† Arundo biomass is mulched and spread on site to deter regrowth.

 

This was a two stage project.† The first stage was to carry out initial treatments on non-native, invasive plants in riparian habitat on MCB Camp Pendleton.† In fall 2007 ACS Habitat Management treated target non-native plants, recorded what plants were treated, monitored re-growth following treatment, and updated the GIS geodatabase with the appropriate information.† Treatment areas included approximately 600 acres of riparian habitat on the Base on the Santa Margarita River.† Treatments were focused on, but not exclusive to, two particular species of concern: Arundo donax (giant reed) and Tamarix sp. (salt cedar).† The target non-native plant species were controlled with herbicide.

 

 

Riparian Weed Control on Marine Corps Base Camp Pendleton

The second stage of this project is to mechanically mow previously treated areas of dead Arundo and tamarisk in the project area along the Santa Margarita River within MCB Camp Pendleton.† The objectives of this project were to mow all dead Arundo and both living and dead tamarisk infestations in order to enhance the native riparian habitat on the Santa Margarita River.† During both stages of this project special attention was given to avoid further damage to the riparian area.† Wildlife biologists were used on site during bird nesting seasons and in sensitive areas to assist in this goal, particularly for the federally listed Least Bellís Vireo and Arroyo Toad.

Above: Arundo biomass is reduced using a tractor mounted rotary mower.† Left:† Arundo is treated using a power sprayer.

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ACS Habitat Management was responsible for the removal of invasive plant species and the native plant re-vegetation on the Department of Fish and Game properties and adjacent private properties in the San Diego River Watershed.† Between the fall of 2008 and the Spring of 2009, >13 acres of dense arundo was removed using both mechanized removal and hand spraying of herbicide.

San Diego River Riparian Restoration & Invasives Control Project

After the initial biomass reduction of the arundo and various other invasives, including Mexican fan palms, treatment of re-sprouts were carried out by hand-crews.

 

Further maintenance entailed continuous retreatments of re-sprout populations, as well as the planting of native riparian plants to assist in the re-vegetation of the area.† These plants were watered on a scheduled basis to aid in their establishment.

Above: A tractor mounted mower carves a path to the river through dense arundo.† Right:† A view of the same section of river after the arundo was mulched and spread on site.

 

ACS Habitat Management was hired by the Mission Resource Conservation District to chemically treat approximately 120 acres of arundo and tamarisk species along the San Luis Rey River and its tributaries.† The dense populations of both arundo and tararisk were situated in and around valuable native plants.† To ensure the protection of the native species, ACS Habitat Management used skilled hand-crews to lay the arundo down, away from natives, and spray them.† Tamarisk species were cut and stump treated to ensure a high rate of kill without harming adjacent plants.

Santa Margarita and San Luis Rey Watersheds Restoration & Weed Management

Once treatment was successful, restoration efforts called for the re-vegetation of the riparian zone with native speices.† Approximately 16,500 plants were used to re-vegetate roughly 120 acres along the San Luis Rey and its tributaries.† The majority of the plants were grown in 1 gallon pots and hand planted once they reached a mature enough size to have a good chance at survival in the ground.† Watering occurred at scheduled intervals to ensure these new plantings had the best possible success rate.† This project was very successful in reducing the number of invasives and restoring the natural plant species in the San Luis Rey Watershed.

Above: Native plants were planted by hand crews and watered on a regular basis to ensure the maximum chance of survival.

Above:† Arundo is laid down away from native plants and treated using a power sprayer.