Thank you for your reply. I live in Sioux Falls, South Dakota - South Eastern SD.
The plants are established plants. The magnolia is a bush and has purple prebloom buds which blossom out into white blooms. The white blooms hardly have a chance since earwigs eat the purple prebloom stage (I think, since I have found them in the prebloom) and the preblooms turn brown.
Thank you so very much for your help. I anxiously wait for your reply. Gene