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Although it should be the general purpose to till the apple orchard throughout its life, whenever the trees seem to be growing too rapidly, the plantation may be seeded down for a time. That is, tillage is the general practice; seeding down and sod-mulching are the special practices. For the first few years, annual crops may be grown in the apple orchard; but every year a more open space should be left about the trees. As often as the land becomes crusted it should be tilled. On strong lands which are well handled, it is rarely necessary to apply concentrated fertilizers until the trees are old enough to bear. What fertilizers are then ; needed, and how much ; to apply, are to be determined by the behavior of the trees. If the trees are making insufficient growth, and the foliage lacks color, one or all of three things may be the trouble: the trees may need water; they may be suffering from insects or disease; they may lack nitrogen. If it is thought that they lack nitrogen, this material may be supplied in the form of nitrate of soda, sulfate of ammonia, or the unburned animal substances, as blood and tankage. Two to three hundred pounds to the acre of the nitrate of soda or sulfate of ammonia are liberal applications on well-tilled lands. If the trees are making vigorous growth, the probability is that they are not in need of more nitrogen. Potash and phosphoric acid may then be applied. Three hundred pounds of muriate of potash, or other concentrated material, should be sufficient for an acre, under ordinary conditions. As a rule, all orchards in full bearing should have a liberal annual application of fertilizing materials. In the East, apple trees should be in profitable bearing at twelve years from planting, and should continue for thirty years. In recent years, lime has been applied in many cases with good results, about 1,000 pounds to the acre every four or five years.
Although it should be the general purpose to till the apple orchard throughout its life, whenever the trees seem to be growing too rapidly, the plantation may be seeded down for a time. That is, tillage is the general practice; seeding down and sod-mulching are the special practices. For the first few years, annual crops may be grown in the apple orchard; but every year a more open space should be left about the trees. As often as the land becomes crusted it should be tilled. On strong lands which are well handled, it is rarely necessary to apply concentrated fertilizers until the trees are old enough to bear. What fertilizers are then ; needed, and how much ; to apply, are to be determined by the behavior of the trees. If the trees are making insufficient growth, and the foliage lacks color, one or all of three things may be the trouble: the trees may need water; they may be suffering from insects or disease; they may lack nitrogen. If it is thought that they lack nitrogen, this material may be supplied in the form of nitrate of soda, sulfate of ammonia, or the unburned animal substances, as blood and tankage. Two to three hundred pounds to the acre of the nitrate of soda or sulfate of ammonia are liberal applications on well-tilled lands. If the trees are making vigorous growth, the probability is that they are not in need of more nitrogen. Potash and phosphoric acid may then be applied. Three hundred pounds of muriate of potash, or other concentrated material, should be sufficient for an acre, under ordinary conditions. As a rule, all orchards in full bearing should have a liberal annual application of fertilizing materials. In the East, apple trees should be in profitable bearing at twelve years from planting, and should continue for thirty years. In recent years, lime has been applied in many cases with good results, about 1,000 pounds to the acre every four or five years.
===Propagation===
===Propagation===
===Pests and diseases===
===Pests and diseases===
[[Mildew]], [[aphids]], [[apple scab]], [[fireblight]], ''[[Gymnosporangium]]'' [[rust]], and [[black spot]]. The soft bark on a young apple tree may be fed upon by pests like [[mice]] and [[deer]], especially in winter.
[[Mildew]], [[aphids]], [[apple scab]], [[fireblight]], ''[[Gymnosporangium]]'' [[rust]], and [[black spot]]. The soft bark on a young apple tree may be fed upon by pests like [[mice]] and [[deer]], especially in winter.
The two staple enemies of the apple are the apple-worm (the larva of the codlin- moth), and the apple- scab. These are readily held in check by spraying with arsenical poisons for the worm, and with lime - sulfur or bordeaux mixture for the scab. See Spraying. Spraying for the worm should be performed as soon as the last petals fall; for the scab as soon as the buds are well burst. In badly infected regions and on very susceptible varieties, it may be necessary to spray first for the scab before the buds swell. Since there are insects (as canker-worms, case-bearers, bud-moth) that appear before the flowers open, it is advisable to add arsenical poison to the fungicide at the early spraying. The number of times to spray depends on the thoroughness of the work, the pests to be combated, and the season; but it is a good rule to expect to spray with the combined fungicide and insecticide mixture when the buds burst, and again when the petals have fallen. In the plains country, less spraying may be necessary for the fungous diseases.
==Cultivars==
==Cultivars==
