According to a publication of the USDA Northeast Low-Input Sustainable Apple Production Project, removing alternate hosts to the codling moth, such as abandoned apple, pear, hawthorn, and quince trees, reduces the immigration of second generation adult codling moths. Apparently, most female codling moths don't venture farther than 200 yards to lay their eggs. Take care not to scrape too deeply or you'll injure the tree. - Routinely thinning out branches to improve air circulation, which helps reduce moisture favored by scab organisms. Burn these prunings so they won't harbor disease. There are conflicting recommendations about whether or not to seal pruning wounds.
Some people believe a tree heals best without any sealer.
Others believe that a sealer helps protect against insects and disease. If you do use a sealer, stay away from paint or asphalt. You could try shellac, a mixture of clay and cow manure, or one of the commercial sealers on the market like Lac Balsam. There's also a controversy about whether cover crops, turfgrass, or mulch is the best ground cover beneath fruit trees. Grass and cover crops can compete with the trees for water and nutrients, so wait until your trees are well established before using these ground covers, and be sure to fertilize your trees.