Imidan or Guthion are your best choices for plum curculio control. Most growers have applied an insecticide against apple blotch leafminer . There is probably still time to apply Agri-Mek against the small, sap feeding mines. I expect to see mines that have advanced to the tissue feeding stage early next week. European red mite numbers are high in a few orchards.
Mite injury is most likely to be significant in the weeks following petal fall.
Check leaves now for mites. The new label on Apollo allows it to be used up to 45 days before harvest. The current thinking is to use Apollo when the first generation summer eggs begin to hatch in early June. Agri-Mek is also recommended against early season mites but should not be applied later than two weeks after petal fall. As apple leaves mature, Agri-Mek is not well absorbed into leaves making mite control much less effective.