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Embedded Wires or Collars - Trees and Shrubs

Back to Common Problems - Trees and Shrubs Tree trunks may be deformed or girdled when hose and wires, ropes, or wire basket collars are not removed. The most common staking method consists of two wooden stakes supporting the tree with hose and wire around the trunk. The stakes, hose, and wire...

Elm Leaf Beetle

The elm leaf beetle, Pyrrhalta luteola will feed on all species of native and introduced elm and zelkova. All stages of the elm leaf beetle develop on or near the elm tree. Adult beetles are about 1/4 inch long and range in color from yellow to olive green with a black stripe along each side of the...

Early Fall Coloration - Trees and Shrubs

Back to Common Problems - Trees and Shrubs Early fall color can be caused by a number of factors including environmental stress, insect damage, and disease. Environmental stresses can be caused by severe drought, poor soil aeration, reduced root growth, nutrient deficiencies, extreme temperature...

Damage to Flowers - Trees and Shrubs

Photo: Freeze damaged Magnolia blossoms Back to Common Problems - Trees and Shrubs Factors that can cause blasted, damaged, or dropped blossoms include environmental stresses and pesticides. Environmental stresses that may damage flowers are drought, frost or freeze damage of flower buds or...

Construction Damage - Trees and Shrubs

Trees can be severely marred or even killed by certain construction practices, some of which are unavoidable. If you are aware of these situations before they occur, damage to trees may be kept to a minimum. Site a new home carefully. Make use of existing trees and avoid excessive grading. Protect...

Chlorine Toxicity - Trees and Shrubs

Back to Common Problems - Trees and Shrubs Scorched leaves may be the result of chlorine toxicity. Chlorine is a micronutrient, essential to plant growth. However, too much chlorine can accumulate in leaf tissue, resulting in leaves with a scorched or burned appearance. Trees with scorched leaves...

Caterpillars - Trees and Shrubs

(Back to Common Problems - Trees and Shrubs) Many caterpillars feed on the leaves of shade trees throughout the season. Gypsy moth is an early season caterpillar that should be controlled on oaks. Other early season caterpillars include Eastern tent caterpillar and cankerworms . Mid to late season...

Cankerworm - Trees

(Back to Common Problems - Trees and Shrubs) There are two species of cankerworms that can be a problem on shade trees: spring cankerworm ( Paleacrita vernata ) and fall cankerworm ( Alsophila pometaria ). They attack many forest and shade trees but prefer apple, elm, oak, hickory, linden, birch,...

Bark Beetles

Return to Common Problems of Trees and Shrubs Publication: (PDF) HG1 Conifer Bark Beetles Bark beetles are very small insects, usually less than 8mm. They are brown to black in color and cylindrical in shape. The beetles generally attack shrubs that are stressed or weakened. Often several beetle...

Burls - Trees and Shrubs

Back to Common Problems - Trees and Shrubs A burl is a large woody, rounded swelling, usually found on a tree trunk. Burls can obtain a diameter up to 3 feet and may have many buds or sprouts. "Burl wood" is prized for its unusual grain pattern. The grain of the wood swirls around each bud trace,...

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