Even with Charlotte's best efforts to control the fall cankerworm with our tree banding program, the population is still high enough to endanger our trees. With the support of City Council, the City recommends a second step to defend cankerworm infested areas – aerial spraying.
The product used in the aerial spraying is Foray 48B. This is not a chemical insecticide. It does contain Bt, a naturally occurring substance used by organic farmers and gardeners for decades. This natural control has no adverse affects on humans, honey bees, pets, birds, wildlife, fish or groundwater. In order to be effective, Bt must be ingested by the caterpillars. The specific enzymes necessary to activate Bt are only found in the digestive system of caterpillars.
Documented studies of Bt have found no adverse affect on humans, plants, water supplies or other organisms. We have links to several of these studies on our website.
The City is projecting the spraying to begin Monday, April 7. Spraying will last for approximately four days. During this time, low flying aircraft will be applying the spray in the early morning hours. Because dates and times are determined by local weather conditions and the hatching of the cankerworms, exact dates are not known at this time. A map of the spray zone is located on our website.
In response to requests to clean off residue from the cankerworm spraying program, Charlotte-Mecklenburg Utilities will temporarily suspend the water use restriction on residential car washing for seven days following the end of the spraying. There are no other changes to the water restrictions at this time.
The City will continue to work with local media to notify residents when the spraying will occur. Residents will also be notified by phone, using the GEO Notify System.
To receive cankerworm updates, visit cankerworm.charmeck.org and sign up for the Notify Me service. You will then receive an e-mail when the website is updated.
As we get closer to April 7, residents can also call 311 for more specific spraying dates and locations.