Integrated Pest Management

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We want to hear from you! 

With mounting concern about the use of Round-up in public landscape areas, the City is taking steps to formalize its policy of maintaining public spaces. Information about our current practices, regulations, and factors to consider in the policy making decision is included below.  

We are interested in your opinions about the use of chemical herbicides in public landscaped spaces. The survey data will be used as a piece of information to help frame the policy. Please click here to take the short survey before 5 PM on Friday, June 28, 2019. Your input is appreciated! This policy is scheduled for discussion at the regularly schedule July 2, 2019 City Council meeting (6:30 PM at City Hall Council Chambers). There will be a public comment period with the agenda item. 

 What is IPM?

IPM stands for Integrated Pest Management; it is an effective and environmentally sensitive approach to pest management. The IPM program provides guidelines for controlling pests (weeds) through adopting Best Management Practices (BMPs) and minimizing pesticide use in the City.

Why are IPM programs important?

An IPM is important to maintain the park and open space appearance, and also maintain ecological balance. It formalizes the practices that we follow when conducting pest eradication like weeds.

What practices does our City currently use?


City of American Canyon Current Pesticides Use



Where applied

Frequency of application

Post- Emergent Herbicide

(Glyphosate- Round Up Custom)

Park and landscaped planting beds, fence lines, tree walls, cracks in hardscapes, bases of transmission line towers, and gravel pathways.

As needed to control unwanted growth of weeds after emergence. On average 2 treatments 6 weeks apart per previously treated sites & spot treatments throughout the year.

Pre- Emergent (Surflan AS)

Park and landscaped planting beds, fence lines, and gravel pathways.

Mainly early Spring and early Fall to prevent the germinating seed banks of unwanted weeds. Spot treatments throughout the year.

Broadleaf Herbicide

(Turflon Ester)

Established turf grasses in park settings to control unwanted weeds in turf.

Average 1-2 applications per year.



Open fields, trails, and unmanicured areas in parks.

4-6 week basis to control the visual aspect of unwanted weeds and grasses during the dry season (Spring through Fall).

Mechanical (Hand pulling)

Only in unwanted weeds and grasses in planter beds in parks and landscapes.

String trimming slightly larger areas and along fence lines, tree wells, light poles, power line bases in landscaped areas or where mowing isn’t available.


Current IPM regulations the City follows

The City must register with the Napa County Agricultural Department every January to receive an Operator Identification Number that allows for the purchase and tracking of chemicals used, vendors submit what chemicals are purchased and users submit monthly reports of what is used. The Napa County Agricultural Department also conducts bi-annual inspections of facilities, training records, and compliance issues related to pest control. Staff members that apply herbicides are all certified by the California Department of Pesticide Regulations and have taken and passed a state provided test.  Qualified applicators are required to attend specific training courses to receive twenty hours of continuing education every two years to keep their certifications current. 

The City must have written recommendations from a licensed Pest Control Advisor (PCA) before purchasing or applying any chemicals.  The PCA takes into account the target pest, and the location and then provides criteria on how much, when and where the chemicals can be applied.

What factors will the City be considering when choosing an IPM program?          

The City will look at various factors to assess which weed eradication method to use:

·         cost (financial cost and labor demand)

·         effectiveness (level of achieved pest control)

·         impacts (environment risk and human health risk)

As stated previously, we currently utilize an IPM approach implementing least impactful methods as a standard and working up until the weeds, or unwanted vegetation is removed. City staff is constantly trying to balance efficiency/effectiveness (time and money) with impact (human and environmental) to achieve landscape aesthetic goals. 

Should the City Council provide policy direction that certain methods (certain chemicals or all chemicals) aren’t available than the Landscape Aesthetic Goals achievement becomes more difficult to achieve with all resources remaining equal.

Click here for more information.