Aircraft typically begin early in the day and will continue until done depending on weather conditions. Flying low to target tree canopy, you may see or hear low flying aircraft for a period of time.
Treatment date(s) depends on insect development, weather conditions, and the stage of the insect targeted. Because treatment operations are weather dependent, spray plans may change at the last minute. The latest updates are available on the Iowa gypsy moth hotline during treatment years.
Landowners in or near a treatment site should receive a postcard prior to treatment with treatment and contact information for any questions. The Iowa Department of Agriculture and Land Stewardship also issues a press release to notify local media of the upcoming aerial treatment. Treatment area maps and additional information are available on this website during treatment years.
Devastating Effects of a Gypsy Moth Outbreak
Black Moshannan State Park; Philipsburg, PA
(treated areas vs. untreated areas)
Gypsy moth is a Federal and State quarantined leaf-eating insect that is a serious threat to forest and urban trees as well as ornamental plants. This pest is not native to North America and has the potential to defoliate trees year after year causing significant environmental, economic, and quality-of-life issues.
Gypsy moth has no significant enemies to keep the pest population in check. A single gypsy moth caterpillar can consume as much as one square foot of leaves per day, and large pest outbreaks can devastate entire forest and urban areas, leaving a bleak winter-like appearance in mid-summer. Infestations of this pest are taken very seriously for the following reasons.
Eastern Iowa is considered to be in the transition zone of gypsy moth advancement. Small pockets of infestation are becoming more common in northeastern Iowa, as would be noticed from the natural advancement of this pest. The established 'western' front for gypsy moth is now considered to be 25 miles east of the Mississippi River in some parts of Iowa.
As the gypsy moth continues to advance, and as more small pockets of gypsy moth infestation become common ahead of the front, the management strategy has been to "slow the spread" of the pest. The best way to control low populations of gypsy moth over a large area is to use mating disruption. This strategy uses the pheromone attractant of the female gypsy moth to confuse the male moth in finding a mate, which in turn limits or controls natural reproduction of the pest. This strategy is expected to prevent low level infestations of gypsy moth from growing to outbreak levels.
Iowa is currently included in the Gypsy Moth Slow the Spread Foundation (STS). STS provides the framework for states to determine the areas that need to be managed for gypsy moth. This program focuses on early detection of low level gypsy moth populations, and then disrupts the normal build-up and spread of gypsy moth in those locations.