IPM Active Pesticide Exemptions
Below are active approved exemptions for the use of pest control products from the Town's Discontinued Use Pesticide Products list. For more information about this exemption process and the products on this list, please see the Town's Integrated Pest Management (IPM) Policy. Questions can be submitted to IPM@townofwindsor.com. You can also sign up to receive notifications of approved emergency exemption pesticide applications.
Active Exemptions:
July 2025**-July 2030: Please be advised that the Town of Windsor will be extending use of pre-emergent herbicides (active ingredients Isoxaben, Pendimethalin, and Dithiophr) to approved streetscapes until July 2030. The extension of this program was approved by the Town Manager and Town Council. Please refer to Town of Windsor 9/17/25 Agenda Report, Item No. 14.1 for information on spray locations.
2021-2026: Please be advised that the Town of Windsor will be applying the herbicide Glyphosate in street medians. The location and application of this product have been approved by the Town Council and Town Manager as an exemption to the IPM through Resolution 3663-21.
Past Exemptions:
Dec 1, 2020: Please be advised that the Town of Windsor will be applying the Fungicide Penta-Bark to the heritage oak tree located at Esposti Park. This application is for the purpose of guarding against sudden oak death.
Jan 21-25, 2021: Please be advised that the Town of Windsor will be applying the herbicide Milestone and Vastlan to the pond berms and immediate perimeter of the towns recycled water ponds. This location is on town property within a secured perimeter.
Feb 21-24, 2023: Please be advised that the Town of Windsor will be applying the insecticide Termidor Foam and Termidor HE to the location of the Senior Center, in order to address the termite infestation that has compromised the building structure. This exemption to the IPM policy has been approved by the IPM Manager and the Town Manager.
October-November 2023: Please be advised that the Town of Windsor will be applying the insecticide Termidor Foam and Termidor HE to the location of the Cunningham House and the Hembree House, in order to address the termite infestation that has compromised the building structure. This exemption to the IPM policy has been approved by the IPM Manager and the Town Manager.
March-August 2024: Please be advised that the Town of Windsor will be injecting the insecticide Emamectin Benzoate, into approximately 545 Oak trees across town in order to combat an infestation of Mediterranean Oak Borer Beetle. The insecticide will be injected directly into the trees, not sprayed into the environment, in the hopes of saving the trees from the beetle infestation. Injections will take place between March and August of 2024. This decision was approved by the Town Council and Town Manager as an exemption to the IPM policy.
Aug 13, 2024-Sep 30, 2024: Please be advised that the Town of Windsor will be injecting the following pesticides into the Oak trees surrounding the Town Hall and Town Green area, as well as the Keiser Park picnic oak grove in order to combat an infestation of Mediterranean Oak Borer Beetle: Mono-and Di-potassium salts of phosphorous Acid and Alklphenol ethoxylate, Polysiloxane polyether copolymer, propylene glycol. This decision was approved by the Town Council and Town Manager as an exemption to the IPM policy.
**November 2022-July 2025: Please be advised that the Town of Windsor will be applying pre-emergent herbicides (active ingredients Isoxaben, Pendimethalin, and Dithiophr) to approved streetscapes from November 2022-July 2025. This is part of a pilot program approved by the Town Council and Town Manager as an exemption to the IPM policy through Resolution (3870-23).
September-October 2025: Please be advised that the Town of Windsor will be applying the herbicide Isopropylamine salt of Imazapyr to combat poison oak emergence along several paths, sidewalks, and parks. Poison oak has become prevalent in several pedestrian pathways and park areas in Town. The poison oak poses a risk to Town employees, contractors, and residents. Parks staff intend to minimize spray drift by using backpack sprayers and applying the herbicide directly to poison oak plants. The locations and application of this herbicide have been approved by the IPM Manager and the Town Manager.
Nov 12, 2025 - Nov, 21, 2025: Please be advised that the Town of Windsor will be applying the insecticide Temperid FX (Imidacloprid and Imidazolidinimine) to the Windsor Community Center service closet to control a population of cockroaches on the premises. The location and application of this insecticide was approved by the IPM Manager and the Town Manager.
March 30 - April 30: Please be advised that the Town of Windsor will be injecting the insecticide Mectinite (active ingredient Emamectin Benzoate) to various oak trees throughout town as a control measure for the Mediterranean Oak Borer beetle. Results will be monitored as part of a study on product efficacy. This exemption was approved by the Town Manger and IPM Manager.
April 1-3rd, 2026: Please be advised that the Town of Windsor will be applying the fungicide RES 505 (active ingredient Flutriafol) to various oak trees throughout town as a control measure for the Mediterranean Oak Borer beetle. Results will be monitored as part of pest control research through the UC Cooperative Extension. This exemption was approved by the Town Manager and IPM Manager.