WI Pesticide Application Signs
(4) Warning signs; form and contents. Each warning sign under sub. (3) shall comply with all of the following:
(a) It shall be at least 4 inches by 5 inches, and shall be attached to a stable supporting device.
(b) It shall contain the information shown in ch. ATCP 29 Appendix B. The information shall be professionally printed with red lettering on a white background, according to the format shown in ch. ATCP 29 Appendix B, except that sign removal dates may be entered by hand. A warning sign may contain supplementary information beyond that shown in ch. ATCP 29 Appendix B if the information is consistent with and does not detract from that shown in ch. ATCP 29 Appendix B.
(c) It shall be constructed and posted so that it remains clearly legible for at least 72 hours after it is posted, despite reasonably foreseeable adverse weather conditions.
http://docs.legis.wisconsin.gov/code/admin_code/atcp/020/29.pdf
