Depending on the size of the plant and what's infecting it, a fungicide spray or injection may be recommended. Usually, the best time to treat for a fungus problem is early spring before bud break and and then follow up as needed. If you have noted damage done in previous years, your trees may need treated before the visual signs of fungus appear in spring or summer again. Below is some information on some of the common tree and shrub diseases that may effect our landscape.
Cankers are dead areas on the branches, twigs, or trunk of the tree, usually formed under the bark. Cankers may be caused by disease, fungus, bacteria or injury to the tree... Read more about cankers >>
Chlorosis is a deficiency of iron in trees and shrubs. Leaves will discolor and turn yellowish of the leaf while the veins remain green. Prolonged iron deficiency may result in defoliation, dieback of branches... Read more about chlorosis >>
Diplodia is a fungus that causes tip blight which disfigures branches of pines, Austrian Pine seems more vulnerable. This fungus will not usually kill the tree, though can seriously disfigure a tree and weaken it... Read more about diplodia tip blight >>
Fire Blight is a common disease which can infect fruiting trees such as pear, apple, crabapple, hawthrone, and other related trees. Visually, clusters of flowers and leaves may begin to wilt and turn brown... Read more about fire blight >>
Leaf spot is circular damaged areas to the tissue of tree or shrub leaves; caused by fungus, bacteria, air pollution, insects or weather. The damaged leaf will begin to develop spots, ranging in size from... Read more about leaf spot >>
Needle cast can be caused by a variety of fungal diseases on trees. The first visual sign is discoloration of the needle, yellow or light green spots will appear prior to the needle turning red or brown... Read more about needlecast >>
Blighting of needles (common on junipers, though also targets arborvitaes in Northwest Ohio). This fungal may be misdiagnosed as other issues as it looks like other stresses on trees... Read more about phomopsis >>
Powdery Mildew is a relatively easy disease to spot when it infects trees and shrubs in the landscape. Although the disease will not kill the plant itself, it will compromise the health of the tree or... Read more about powdery mildew >>
Scab is a common disease on apples, crabapples, hawthorn, mountain-ash, cotoneaster, firethorn and pears. Apple scab lives on infected leaves and fruit of the plant and can spread with the spring rains... Read more about apple scab >>
leaf scorch appears as browning or discoloring of the leaf margin which gradually consumes the remaining tissue of the leaf. Bacterial leaf scorch reoccurs year after year, slowly defoliating... Read more about scorch >>
Tar spot are raised, black, circular deformations of maple leaves that begin to form as small yellow or black spots in early summer. The disease is primarily cosmetic and will not damage the tree, although it can be unsightly. Read more about tar spot >>
Verticillium Wilt is a soil-borne fungus which can infect a variety of trees and shrubs. It is difficult to control because the host of the disease is the soil, not the plant necessarily.. Read more about wilt >>
Fungicides may be used as a preventative or corrective measure; they can work by either preventing or interfering with the germination process of the fungal spores or destroy the fungus outright. Contact fungicides will not be absorbed by the plant's tissue and will only remain active on the surface of the plant in the location applied. This is beneficial since it rarely leads to the fungi building a resistance against the fungicide since the residual does not last long. Penetration fungicides may also be an option. This sort of fungicide not only penetrates the leaf of the plant (in which it can then travel to other portions of the plant) but may also be used as a contact fungicide. Penetration fungicides can be used to protect new growth from potential fungus attacks.
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