After eight to twelve days the adult moths emerge. In Pennsylvania, there may be three to four generations per year under favorable conditions. Although this insect is not as serious a pest as the Indian meal moth and some of the grain infesting beetles, it still causes clogging of machinery with its webbing, and at times causes grain mill shut-downs. In recent times, the use of fumigants has greatly reduced the incidence of the Mediterranean flour moth. Proper bin sanitation before introduction of new grain minimizes the need for pesticides.
Good sanitation involves the removal of old grain and dust in and around the grain bin.
This includes removal of old grain from corners, floors, and walls and grain that may have spilled on the exterior of the bin. Any grain remaining when a bin is emptied can harbor insect infestations which will move into the new grain. After the bin is cleaned, and all needed repairs have been made, the floor and wall surfaces both inside and outside the bin should be treated, if the grain will be stored for more than six months. Take special care to treat all cracks, crevices, and areas around doorways and other places where insects could hide or enter. Spray the bins about four to six weeks prior to storing grain.