Pruning almond trees will improve their structural integrity and prevent limb breakage, establish tree shape, permit easy access for equipment and ensure tree health and longevity. Proper pruning of almond trees will also help to ensure a high-quality yield. Almond tree pruning should be based upon insect management, sanitation and market strategies. Growers should be wary of over-pruning, which will negatively affect fruit production.
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Almond trees should be pruned shortly after planting to allow the development of a high lead that will eventually facilitate easier mechanical harvesting. Cut the bottom of the almond treetop at 105 cm (42 inches) from ground level. This pruning at planting will also allow easier scaffold selection during the tree's first dormant season.
First growing season
By the time new shoots are 10 to 15 cm (4 to 6 inches) long in March or April, trim shoots off of all except the top 20 cm (8 inches) of the canopy. Within the top 20 cm (8 inches), remove the weaker of any twin shoots.
Almond trees are typically pruned in the winter following leaf drop. Pruning at this time will improve vigour without removing actively photosynthesising limbs. Most pruning and selection of scaffolding branching is typically done after the growing season is over. Almond growers also generally tie the trees and head the main scaffolding in late winter or early spring.
Wilbur Reil of the University of the California and some associates conducted a study using nonpareil almonds to determine the effects of early autumn pruning as compared to winter dormant pruning. Results indicated no significant differences in yield between autumn and winter-pruned trees. Autumn pruning can also improve scheduling flexibility by taking advantage of the workforce when there are otherwise few labour needs, and pruning can be completed long before dormant sprays are applied.
Light, corrective pruning to remove diseased or damaged limbs can be done as necessary year-round. Promptly remove limbs that have broken as a result of wind damage or have an infection like ceratocystis canker or brown rot blossom blight.
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