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Thinning reduces the stand so that growth
is distributed to those trees you wish to keep for future products. Thinning should
leave 25 to 30 trees per acre for nut production, and 75 to 100 trees per acre
for lumber production. A thinning may be required two or more times during the
life of the stand.
Avoid thinning before trees reach a size at which they
can be marketed. Precommercial thinning is expensive. Besides, competition encourages
tree height. The main stem is shaded, which reduces side branching. Also, the
loss of trees to uncontrollable conditions such as disease and insects has less
impact. Plan thinning or intermediate harvesting of marketable trees. Your stand
of black walnut would be improved by harvesting inferior trees during thinning.
When the plantation age reaches 10 years or more, you may begin selection
of better trees. If you decide to thin later, only trees less than 9 inches in
DBH should be removed.
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From crown to roots, the entire black walnut tree is susceptible
to disease and insect damage which affects production and quality. Learn to recognize
black walnut insects and diseases and the damage they produce. Some insects that
attack the black walnut tree are the ambrosia beetle, the curculios, the black
walnut caterpillar, and the bud borers and case bearers.
Fungi are responsible
for most diseases of the black walnut. Walnut anthracnose and other leaf-spot
diseases can affect both young and mature trees. Root rot mainly damages young
seedlings, and cankers and decay affect older trees. Avoid diseases and insects
by culling infected seedlings, maintaining stand vigor, and reducing tree stress.
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From crown to roots, the entire black walnut tree is susceptible
to disease and insect damage which affects production and quality. Learn to recognize
black walnut insects and diseases and the damage they produce. Some insects that
attack the black walnut tree are the ambrosia beetle, the curculios, the black
walnut caterpillar, and the bud borers and case bearers.
Fungi are responsible
for most diseases of the black walnut. Walnut anthracnose and other leaf-spot
diseases can affect both young and mature trees. Root rot mainly damages young
seedlings, and cankers and decay affect older trees. Avoid diseases and insects
by culling infected seedlings, maintaining stand vigor, and reducing tree stress.
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