Weeds

Integrated Pest Management (IPM)

IPM Goals | Annual Reports | Methodology | Invasive Species | Resources

  

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Yellow Star Thistle

An important part of the Park District’s stewardship work is preventing and controlling pests. This is done in a sustainable and ecologically-minded way by using the principles of Integrated Pest Management (IPM). The Park District’s IPM program is an essential activity to maintain healthy ecosystems that benefit plants, wildlife, and the quality of park experience for our visitors.

IPM is a widely accepted, science-based approach used to effectively reduce pest populations while minimizing hazards to human health and the environment. A "pest" is any organism that causes damage to human health, recreation, or ecological function.

By far, the largest volume of pests in the Park District are weeds that degrade recreational enjoyment of open spaces and increase fire risk. The Park District’s IPM program also targets weeds that threaten biological diversity and ecological function. Additionally, the IPM program controls organisms such as harmful algal blooms, ticks, yellow jackets, rattlesnakes, rats, and mice; all of which pose threats to public health.

» Learn more about Integrated Pest Management 

IPM Goals

The principal goals of the Park District’s IPM program are:

  • Healthy Forests – Park District wide efforts to reduce risk of catastrophic fire in the wildland and urban interface.
  • Public Health – Remediation of pests that pose a threat to public health, such as treatment for ticks, E. coli, and harmful algal blooms.
  • Ecological Function – Vegetation and pest management to promote and maintain sensitive natural resources and increase biodiversity. This broad category includes habitat enhancement, ecological restoration projects, and environmental programs.
  • Safe and Accessible Recreation – Vegetation management to maintain recreational use, including landscaping, gardens and other recreational uses.
  • Fire Safety – Vegetation management around ignition sources, building perimeters and fire access areas that are prone to ignition and/or in fire prone areas. These access areas include trails, roads, barbeques and fire pits, campgrounds, high use picnic areas, parking lots, buildings, and infrastructure perimeters.
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IMPR Cover 2019

Annual IPM Reports [PDFs]

2021 |20202019 | 2018 | 2017 | 2016 | 2015 | 2014 

Presentation on 2018 Program: April 10, 2019 (PPT Deck, 23 pp.)

IPM Methodology

IPM is not a single pest control method but rather an approach that weighs the benefits and potential hazards of multiple control options and helps identify on the optimum combination of methods for a given situation.

 

Prevention, Monitoring and Identification of Potential Pests

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Weed Workshop

As a first line of pest control, the IPM programs work to prevent the introduction and spread of pests. This can be done by identifying potential pathways of introduction and limiting risk. For instance, making sure that equipment used in natural areas has been cleaned so that it does not move weed seeds to a new site.

 

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Goats

Active monitoring of areas that are at high risk for introduction, like trailheads, can help to locate new introductions quickly so that appropriate control actions can be determined and implemented early. Additionally, monitoring after treatment is part of evaluating efficacy.

The Park District trains its staff every year in identification, mapping, and monitoring for new threats to our wildlands and outdoor activities. The public is also invited to map weeds through the Calflora mobile platform. Staff use data from this valuable community science tool to focus efforts and prioritize actions.

Control Methods

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Person cutting grass

IPM includes a range of control methods types. Including: cultural, mechanical, biological, or chemical. Using multiple methods together typically provides the strongest approach. Through adaptive management the approach can be fine-tuned by gauging success over time. The Park District prioritizes and emphasizes cultural, mechanical, and biological controls or a combination of these before considering chemical controls.

• Cultural controls are changes to the environment that disrupt the ideal pest conditions and decrease pest population. Examples of cultural control methods include mulching, grazing, competitive planting with native plants, and watering responsibly to control soil moisture. Over 85,000 acres, 68% of our lands use grazing to provide fuels control and improve biological diversity.

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Staff assisting with biocontrol release

• Mechanical control is the management of pests by physical means. Mechanical control methods include hand pulling, digging, mowing, and line trimming. The Park District prioritizes mechanical methods to control vegetation along roads and trails. Fire roads and trails are rough mowed or line trimmed. Fencing is line trimmed, as are most group camps and other recreational areas.

 Biological control utilizes natural or introduced enemies of a pest, such as an inset that feeds on a pest plant, to reduce the ability of the pest to spread. Additionally, the IPM program works collaboratively with researchers from the USDA-Agricultural Research Service to introduce host-specific biocontrol agents for specific weeds.

• Chemical controls include the use of organic and conventional registered products that are used to control plants, insects, fungi, or other pests. Organic and conventional herbicides are used when mechanical and cultural methods are ineffective. Organic and conventional or organic products are never used in and around play structures and drinking fountains.

Invasive Plant Species 

Invasive Weed Brochures

Invasive Weed Identification Guides

Resources

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