City of Worthington Calendar
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February 13, 2020
6:00 PM - 8:00 PM
Perry Township Hall
7125 Sawmill Road

Dublin , OH 43016
(614) 728-6400
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Gypsy Moth Treatment Informational Meeting

Thursday, February 13, 2020

The City of Worthington has received information from the Ohio Department of Agriculture about plans for areas across Ohio, including Worthington, to receive gypsy moth aerial treatments this spring or summer. The treatments planned in Worthington are called disruption treatments, which include spraying over wooded areas at very low levels to disrupt the pheromones and subsequent mating. A number of public meetings are scheduled, including one in Worthington on Wednesday, February 12th and one in Perry Township on Thursday, February 13th.

Gypsy moths are invasive insects that attack more than 300 different types of trees and shrubs, with oak being the preferred species. In its caterpillar stage, the moth feeds heavily on the leaves of trees and shrubs limiting their ability to photosynthesize. A healthy tree can usually withstand only two years of defoliation before it is permanently damaged or dies.

Currently in Ohio there are 51 counties under gypsy moth quarantine, limiting the movement of regulated articles out of those counties.

To combat this problem, the department uses different types of treatment strategies to slow the spread of gypsy moth in Ohio. Officials have three programs aimed to manage the pest, including: 
  • The “Suppression” program, which occurs in counties where the pest is already established. Landowner(s) must voluntarily request treatment to help suppress populations. 
  • The “Slow-the-Spread” program, which occurs in counties in front of the larger, advancing gypsy moth population. In these counties, officials work to detect and control isolated populations in an effort to slow the overall advancing gypsy moth infestation. 
  • The “Eradication” program, which occurs in non-infested areas where an isolated population occurs, often due to the movement of infested firewood or outdoor equipment. Department officials use control treatments aimed at eradication of gypsy moth from these areas.

Treatments used for gypsy moth control include: 
  • Foray (Btk), a compound derived from a naturally occurring bacteria found in the soil that is effective in gypsy larvae control 
  • Mating disruption product, flakes or liquid that disrupt the male moth’s ability to locate females during mating season 
  • Gypchek, a bio-insecticide specifically used for control of gypsy moth

The department uses different types of treatments, depending on the location and extent of infestation. All treatments require an aerial application. Foray and Gypchek treatments will take place in early to mid-May, and mating disruption treatments will begin in mid-June. The treatments are not toxic to humans, pets, birds or fish.

Citizens who cannot attend the open houses and would like to provide official comment about the proposed treatment blocks should send correspondence to the department by March 1. Letters can be sent by e-mail to or by hard copy to the attention of the Gypsy Moth Program, Plant Health Division – Building 23, Ohio Department of Agriculture, 8995 E. Main St., Reynoldsburg, OH 43068.