European Apple Sawfly. Larvae overwinter in the soil, and pupate in the early spring. Adults emerge and lay eggs between pink and petal fall. Eggs are laid near the calyx end of the fruit. As the larvae feed, they form a winding borrow just under the skin, leaving a russetted scar at harvest.
Uncontrolled larvae can enter a second fruit and borrow into the core.
A petal fall spray of Guthion or Imidan usually provides adequate control, but in problem blocks both pink and petal fall sprays may be needed. European Red Mite. The European red mite overwinters in the egg stage on twigs and in bark cracks and crevices. On apples, eggs normally hatch during the prepink to early bloom bud stages, whereupon the mite larvae crawl to the unfolding leaves and commence feeding. European red mites can build up to the point where leaf bronzing is visible by mid- to late July.