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Anticipated Pesticide Application Calendar

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Notice of Intent to Apply Herbicides: Various Open Space Managed Sites

  • Date: -  
  • Location: Various Open Space Managed Sites
    Davis, California 95616/95617/95618
Proposed Dates of Use: October 1, - October 31, 2025; as weather conditions and operational factors permit.

Street Address/Site Name: North Davis Uplands, South Fork Preserve, Mace Ranch Park Passive Recreation Area, Woodbridge Natural Area, Willowbank Areas 9&10, Howat Ranch, Wildhorse Ag Buffer, Cannery Hedgerow, North Davis Channel “A”, 1818 facility

Detailed Location of Application Site: Throughout managed areas, including: trails, developed parking areas, kiosks and seating areas, roads, fence lines, access points, habitat areas. 

Posting and Notification: Site notifications will be posted at least 48 hours before application at site entrances and will remain posted for 24 hours, and via the pesticide application electronic notification system.

Pesticide Products: Capstone, Telar & Vastlan

Product (W/ active ingredients): Capstone Triclopyr 16.22% & Aminopryalid 2.22%
EPA Reg #: 62719-572
Pesticide Type: Herbicide
City Use Type: Tier II. Less Hazardous. Less Restrictive. 

Product (W/ active ingredients): Telar Chlorsulfuron 75%
EPA Reg #: 432-1561
Pesticide Type: Herbicide
City Use Type: Tier II. Less Hazardous. Less Restrictive. 

Product (W/ active ingredients): Vastlan Triclopyr choline 54.72%
EPA Reg #: 62719-687 
Pesticide Type: Herbicide
City Use Type: Tier II. Less Hazardous. Less Restrictive. 

Target Pests: Small Woody Vegetation & Various Perennial and Annual Weeds including Blackberry, Short-pod Mustard, Pepperweed

Justification for Use: The use of herbicide is justified as the product will aid in suppressing the weeds that are not able to be managed solely by hand or mechanically due to their vegetative growth characteristics or proximity to desirable plants. Mowing and string trimming are not feasible ways to manage the unwanted vegetation as they scatter vegetative material and promote new growth throughout the site. Other species have large roots which disrupts the landscape for desirable plants when dugout or from other cultivating methods. 

Explanation of IPM Methods Used: Staff primarily employ non-chemical control methods throughout the Open Space managed sites including mowing, trimming, hoeing, hand pulling and solarization. Prior chemical applications have shown to successfully suppress the undesired vegetation. Past attempts with solarization was shown ineffective to control vegetation on large uneven terrain. Grazing and prescribed fire has been re-incorporated where feasible as a vegetation management tool.

Strategies to Prevent Future Applications: The primary strategy to prevent future herbicide applications is to manage the emerging vegetation and preventing seed-set. This will require at least one well-timed application annually. Additionally, reseeding native plant species to help outcompete and shade-out unwanted weeds. Staff will continue to incorporate grazing and prescribed fire as a vegetation management tool where feasible. 

More information on the IPM Program, including the current Policies and Procedures guidance, can be found on the City's webpage: Integrated Pest Management
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