This message is an alert for growers and retail bedding plant sellers that some petunia seedlings have been detected in the U. S. that are infected with tobacco mosaic virus (TMV). TMV is very common and has a wide host range, but infection in flats of seedlings could be problematic. Purchase your plants from reputable suppliers. Anything with a chlorotic yellow mottle should be sent to your county office or the UD Plant Diagnostic Clinic and be tested for TMV.