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Management Programs

Ohio operates three programs to control the gypsy moth population:

  • The Suppression Program (in the infested zone) is in areas where the gypsy moth is well established and treatments are performed at the voluntary request of the landowners. 
  • The Slow-the-Spread Program (in the transition zone) focuses on monitoring, detecting, and reducing isolated populations to slow the gypsy moth's natural movement across the state.
  • The Eradication Program (in the uninfested zone) focuses on monitoring and detecting any populations that may have jumped out ahead of the transition zone, due to artificial movement. Treatments are so designed to "eradicate" the isolated populations.


Click here for the Suppression Treatment Application package:

ODA's Gypsy Moth Suppression Program began in 1989.  Because the gypsy moth is already established in 51 counties in Ohio, the goal of the suppression program is not to eliminate the moth, but to protect trees and reduce defoliation in these areas.

This program is coordinated and funded by ODA, USDA Forest Service and private landowners wishing to participate through a 50/50 cost share.  This program is strictly voluntary. 

Landowners may request the state apply an aerial treatment for the gypsy moth by submitting an application through a "block coordinator" in late summer (deadline is Sept. 1).  ODA staff will then conduct a survey to determine if treatment block meets the criteria for suppression treatment.

Treatment criteria:

  • Proposed block must be located in a county that has been designated quarantine for gypsy moth by ODA.
  • Proposed block must contain a minimum of 50 contiguous forested acres.
  • Proposed block must have a concentration of at least 250 egg masses per in residential forested areas or 1000 egg masses per acre in uninhabited forested areas.
  • Proposed block must have a tree canopy that covers no less than 50% of the block.
  • Proposed block must consist of at least 35% of tree species that are either susceptible or slightly resistant to the gypsy moth.
  • Proposed block must receive a favorable T & E Assessment from ODNR and the US F & W Service.

Once approved, cost share payment from the landowners will be due by March 1 of the treatment year.

Treatment options include Btk, Gypchek, Diflubenzuron, and Tebufenozide.

Slow the Spread (STS)

The Slow the Spread Program is a national strategy funded by the USDA (Forest Service and APHIS) and State cooperators that lie along the leading population edge.  The purpose of STS is to reduce the overall rate at which the gypsy moth spreads into uninfested areas.

Ohio, which is located along this leading edge, implements STS by deploying pheromone traps (delta and milk carton) to monitor movement; evaluate, detect or delineate newly established colonies and then conducts treatments to slow the spread. Approximately 12,000 traps are set each year in Ohio. 

Trap catches above a certain threshold triggers more intensive trapping the following year to help delineate the location and extent of infestation.  In the third year, some measure of control is taken. 

Treatment options include mating disruption, Btk, Gypchek, Diflubenzuron, and Tebufenozide.

More information about the STS program can be found at the Gypsy Moth Slow The Spread Foundation.


The Eradication Program deals with isolated gypsy moth populations that arise beyond the transition area in what is considered the non-infested zone. These populations develop as a result of human movement of gypsy moth life stages on infested material such as fire wood or other outdoor materials from outside the area. The objective is to eradicate these small isolated populations before they can establish themselves.

Funding for the Eradication Program comes from USDA – APHIS / PPQ and the state cooperators.

Treatment options include Btk, Diflubenzuron and Tebufenozide.