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Tree Problems

Integrated Pest Management Program

Call us today to ask about our Integrated Pest Management Program for the variety of pests, fungi and other hazards that can destroy your valuable landscape assets.Treat your trees now, with the help of our certified arborists, all of whom hold pesticide applicator licenses.

Your guide to the most common pest and tree problems in the metro area:

Emerald Ash Borer

Twin City Tree Service provides Emerald Ash Borer (EAB) treatment plans in St. Paul, Minneapolis and its surrounding areas. Discovered in North America in 2002, the EAB infests and kills the green, white, black and blue ash trees that are popular in the Minnesota area. Evidence of the EAB can take up to a year to recognize, but some signs of infestation include D-shaped holes in the bark of the trunk or branches and shoots growing from the base of the tree. Our ISA Certified Arborists are here to help you with all of your EAB treatment needs. We are licensed, bonded and insured and can also provide references upon request.

Dutch Elm Disease (DED)

Dutch elm disease (DED) is caused by a member of the sac fungi (Ascomycota) affecting elm trees, and is spread by the elm bark beetle. Although believed to be originally native to Asia, the disease has been accidentally introduced into America and Europe, where it has devastated native populations of elms which had not had the opportunity to develop resistance to the disease. The name "Dutch elm disease" refers to its identification in 1921 and later in the Netherlands by Dutch phytopathologists Bea Schwarz and Christine Buisman who both worked with Professor Johanna Westerdijk. The disease is not specific to the Dutch elm hybrid. - Wikipedia

Bronze Birch Borer (BBB)

The bronze birch borer Agrilus anxius is a wood-boring Buprestid beetle native to North America, more numerous in warmer parts of the continent and rare in the north. It is a serious pest on birch trees (Betula), frequently killing them. The River Birch Betula nigra is the most resistant species, other American birches less so, while the European and Asian birches have no resistance to it at all and are effectively impossible to grow in the eastern United States as a result.

Oak Wilt

Oak wilt is a fungal disease that can quickly kill an oak tree. It is caused by the fungus Ceratocystis fagacearum. Symptoms vary by tree species but generally consist of leaf discoloration, wilt, defoliation, and death. The fungus is spread from diseased to healthy trees by insect vectors or via connections between tree roots.

Two Line Chestnut Borer

Adult two lined chestnut borers primarily attack oaks that are damaged by drought or trees that are suppressed or declining. Urban oaks that suffer stress from trunk and root injury, soil compaction, and changes in soil depth are equally vulnerable to attack by this pest.

Japanese Beetle

The beetle species Popillia japonica is commonly known as the Japanese beetle. It is about 15 millimetres (0.6 in) long and 10 millimetres (0.4 in) wide, with iridescent copper-colored elytra and green thorax and head. It is not very destructive in Japan, where it is controlled by natural predators, but in America it is a serious pest of about 200 species of plants, including rose bushes, grapes, hops, canna, crape myrtles, birch trees, linden trees and others.

Spruce - Needle Cast

One of the most common diseases of ornamental spruce is Rhizosphaera needle cast, caused by the fungus Rhizosphaera kalkhoffi. Colorado blue spruce is usually the target of this fungal disease, but white and Norway spruce can also be infected. The loss of needles from the inner branches on the lower portion of the tree gives it a hollow appearance​

Apple Scab

The apple scab fungus, Venturia inaequalis overwinters in leaves that have fallen to the ground. Ascospores develop during the winter and mature during the spring. As batches of spores mature, they are forcibly released into the air during rain events, with peak spore release occurring during bloom. Wind currents then carry the spores to newly expanding buds, where a film of water is necessary for successful spore germination and infection. Infection occurs most rapidly when fruit and leaves remain wet for a minimum of 9 hours and temperatures are between 55° and 75°F.

Girdling Root Syndrome

Urban landscapes are filled with trees that are planted too deeply. When root systems of trees are planted as little as six inches to several feet below the soil surface, they are buried too deep. These roots are unable to support the nutrient and water needs of the tree. In effort to survive, trees often create new roots from trunk tissue at the soil surface. These roots are called epicormic roots. They serve to keep the tree alive by acquiring nutrients and water. Epicormic roots do not provide structural stability for the tree and are prone to bending, often growing in a circling pattern. If the roots grow close enough to the tree trunk they will compress the sapwood and eventually cut off the flow of water and nutrients. This disorder is called Stem Girdling Root Syndrome (SGR) and is one of the primary causes of tree decline in urban landscapes. Without treatment, SGR’s will eventually prove fatal to the tree.

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