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A number of different trees are affected by anthracnose disease. This fungal disease can cause severe leaf blighting and deformation, but in many cases the damage to the plant health is not severe. The most common symptoms include irregular browning patches along the veins. The fungus spreads from infected tissue in spring to new growth. Applications of fungicides are used for control. Fungicide injections are available also.

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Apple scab is a fungus and occurs on apple and crabapple trees. In late fall to early spring round black dots appear primarily on infected leaves from the previous year. Spores are released from these spots in the spring and blown by wind or splashing rain to new growth on nearby trees. The fungus infects leaves, fruit, petioles, and blossoms of the tree. Symptoms on infected leaves initially appear as velvety brown to olive colored spots then turning black. Heavy defoliation may occur, causing trees to be less attractive, reduce growth and yield, and increases susceptibility to winter injury. Fungicide applications or injections may be necessary to control apple scab.

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This disease begins with young leaves at the tips of shoots. Small yellow spots first appear and as the infection spreads the leaves die and shoots fade to reddish-brown and die back. Applying fungicides will help control this disease.

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SEASON: Spring to fall.

APPEARANCE: The most obvious symptom of this disease is elongated circular spots on the grass blades. These spots have a brown or straw-colored center with black to purplish borders.

FAVORABLE CONDITIONS: Cool (50º to 70º F), moist conditions are most favorable for the growth of leaf spot. The spots first appear on grass in shady areas of the lawn. They occur most commonly during wet, humid weather or in lawns that are often lightly sprinkled or mowed too closely.

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Rhizosphaera is a fungus disease and typically affects blue spruce trees. Symptoms of the disease are discoloration of the needles, needle drop, and eventually turn brown. Infection takes place in the spring, but symptoms are not visible until the following spring and summer. Infected needles turn a reddish-purple color. The disease is spread primarily by rain water splashing the spores from infected needles to newly emerging needles. A fungicide is used to help control and prevent the spread of this disease.

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Many landscape plants are susceptible to powdery mildew fungi. This fungus usually appears as a grayish or white powdery growth on the leaves and other tissue. Most powdery mildews are unlikely to seriously harm certain plants but may cause leaves and shoots to become distorted and infected leaves to drop prematurely.

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Oak wilt is a fungus that moves from tree to tree by insects or transporting it underground through the roots. Most new tree infections occur as a result of the fungus moving from an infected tree to a nearby healthy tree through connected root systems. The symptoms vary depending on the variety of oak but usually include leaf discoloration and wilting. This disease shows symptoms and cause death in a very short period of time.

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Dutch elm disease is a fungal disease in elm trees that is spread by the elm bark beetle. The symptoms are the result of a fungus infecting the vascular system of the tree. This infection clogs the vascular tissues, preventing water movement to the crown and causing the tree to wilt and die. The leaves begin by wilting and proceed to yellowing and browning. The most effective means of preventing the disease is to control the population of the insects that transmit the fungus. Fungicides are used to halt the fungus once it has infected a tree

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Iron deficiency causes new foliage to be undersized and pale. Fading appears first around leaf margins, then spreads inward until only the veins are green. Brown spots between leaf veins can also develop and leaves may later dry and drop prematurely. Iron is present in most soils; however, if the soil is alkaline iron is less available. The plants are unable to absorb iron under these conditions. Different methods are used to correct this deficiency depending on plant type and size.

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This disease begins with young leaves at the tips of shoots. Small yellow spots first appear and as the infection spreads the leaves die and shoots fade to reddish-brown and die back. Applying fungicides will help control this disease.