When growing organic apple trees, good cultural practices can go a long way toward avoiding the use of fungicides in particular. Pests, however, are another matter. When you detect pest infestations in your apple orchard, adopt a spray schedule that includes several organic and natural sprays, depending on the types of inspects.
Spray apple trees with a biological soap to treat rosy apply aphids, apple aphids and apple grain aphids. Spray in summer but before petals fall.
Spray dormant oil during winter or early spring to treat aphids, mites and scale. Do not mix the dormant oil with sulfur or lime sulfur.
Get rid of the tentiform leaf miner with Pyrethrum or Sabadilla sprays between bud-break and apple harvest. Rake up and remove all dead leaves in the fall to eliminate leaf miner pupae.
Treat leaf roller infestations by spraying with Bacillus thuringiensis once in June and again between mid-July and mid-September.
Treat codling moth infestations with Bacillus thuringiensis as well. Perform two spray applications in June and two more between August and mid-September.