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Aerial Spraying
Gypsy Moth Aerial Spraying
The Department of Agriculture, Trade and Consumer Protection annually conducts aerial spraying on gypsy moth caterpillar populations in the non-quarantined counties and in isolated “hot spots” in the far-western part of the state. Its objective is to slow the spread of gypsy moth populations in the non-quarantined counties.
The Department of Natural Resources coordinates a voluntary suppression spray program for landowners and communities in the quarantine counties. Its objectives are to suppress gypsy moth populations and reduce defoliation to biologically acceptable levels in the quarantined counties.
You will need a PDF reader to view the following documents.
Fast Fact sheet for a program summary of the 2009 season - Coming soon!
Spray operations
We use the latest technology and science to keep the gypsy moth caterpillar from spreading to new areas or causing widespread defoliation in Wisconsin. Spray blocks are precisely plotted using GPS technology, and the spray planes are outfitted with GPS equipment to accurately target the spray blocks. This helps ensure that spray materials are deposited in the intended areas.
To get the best results from the insecticides used in our program, the spray planes must fly low over the tree tops, spraying directly onto the leaves the small larvae are feeding on to ensure good application. These planes are small, a little larger than a Cessna, but because they are flying low, they are fairly loud.
We usually spray in the morning because we need the high humidity and low winds to assure the spray does not evaporate or blow away. Planes remain in the area as weather conditions allow for the completion of the day’s spray plan. Spraying depends on good weather so plans can change at the last minute.
We spray with three different products, used separately: Bacillus thuringiensis kurstaki (Btk), NPV or Gypchek and flakes.
How will I know when spraying begins?
Before we spray, we notify the local media, any nearby airports, local schools, health departments, and local and county law enforcement about our spray plans. We also send postcards to residents living in or near a spray block a few weeks before spraying starts.
People can call 1-800-642-6684 and select option 1 to listen to a recorded message about our daily spray plans and updates. If people would like to be on our spray contact list, please call 1-800-642-6684 select option 3 and leave your name, address and phone number, or e-mail gypsymoth@wisconsin.gov.
How spray blocks are selected
Spray blocks in the STS program are determined on the basis of trapping results. The STS program works to prevent establishment of gypsy moth by detecting populations just as they get started, and then treating them to prevent further growth or spread. The populations are typically low to where they are detectable only using the pheromone baited traps. Trap results are examined each fall and decisions made on which areas to treat based on comparison with results from previous years and knowledge of the factors influencing the risk of establishment and spread. Not all populations can be treated; those that pose the greatest risk are prioritized for treatment.
The Airplanes
DATCP and the DNR contract an aerial spraying company to conduct the sprays. Our applicator is a company with extensive experience nationwide and with an excellent safety record. We hire the contractor who meets the high standards we demand; we are not obligated to accept the lowest bid.
For more information, call toll free 1-800-642-6684 and select option 3, or e-mail gypsymoth@wisconsin.gov.
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