Warning signs must be posted so that they are clearly visible from each point of entry into the treated landscape. Warning signs should be visible from roads, sidewalks, driveways, doorways, alleys, or adjacent yards. Warning signs are not required in areas where a fence, wall, hedge, or similar structure effectively prevents human access to a treated landscape. If an area is fenced, warning signs must be posted near the gate area. Warning signs must be posted before the application.
Many commercial applicators post just before starting an application.
Signs must be posted even if the pesticide label does not state a prescribed re-entry interval. Signs must remain in place until sunset of the day following the application. All signs must indicate the date on which they may be removed. Warning signs must be at least 4 inches by 5 inches, have a white background with red lettering and be attached to a stable supporting device. The use of vinyl flagging material is permitted as long as the information on the sign is visible when posted.