If you have questions or concerns about any pesticide, you can call the Pesticide Hot Line operated by the EPA and the Oregon State University at: 1-800-858-7378 They are available from 6 AM to 4:30 PM 7 days a week. They also maintain a web site at: www.ace.orst.edu/info/nptn They are very helpful if you have questions concerning a product and its expiration day, or certain chemicals it contains.