White latex paint brushed on the exposed portion of the rootstock will prevent new infestations of the borers, and also protect against southwest injury to the bark. Dilute trunk applications of an insecticide with good residual activity can provide control of established infestations. Lorsban 50WP or Thiodan 50WP are the most effective materials if applied during the period between July 15 and August 15, bearing in mind the specific pre-harvest intervals. Mullein Bug Mullein bug damage has been observed on Delicious fruit in a few Vermont orchards. Feeding on fruit by the insect results in upraised, pimple-like bumps.
Fruit often becomes misshapen as it increases in size during the season.
Petal Fall is the time to manage this insect.