Snow MoldSnow mold is a fungal disease that appears in early spring as the snow melts. There are two types of snow molds, gray and pink, that become active under the snow cover. Gray snow mold (also called Typhula blight) is caused by Typhula spp., while pink snow mold (also called Fusarium patch) is caused by Microdochium nivalis.
Dollar Spotis caused by the fungal pathogen Sclerotinia homoeocarpa, in the Sclerotiniaceae family. The pathogen blights leaf tissues but does not affect turf grass roots or crowns. The disease is a common concern on golf course turf, but is rare in sports turf and professional landscapes.
Leaf SpotLeaf spot is a common descriptive term applied to a number of diseases affecting the foliage of ornamentals and shade trees. The majority of leaf spots are caused by fungi, but some are caused by bacteria. Some insects also cause damage that appears like a leaf spot disease. Leaf spots on trees are very common and generally do not require spraying. Leaf spot may result in some defoliation of a plant. An established plant can tolerate almost complete defoliation if it happens late in the season or not every year. Small or newly planted trees that become defoliated are more at risk of suffering damage until they become established.
Necrotic Ring Necrotic ring is caused by a root-infecting fungus (Leptosphaeria korrae), that affects Kentucky bluegrass and annual bluegrass on golf courses, sports turf, professional landscapes, and home lawns. Although it is not often a devastating disease that kills large areas or turf, moderate to severe outbreaks will disturb the appearance of the turf stand and may adversely affect playing surfaces.
Ascochyta (Heat Blight) Ascochyta is a rapidly spreading turfgrass disease resulting in large areas of bleached, blighted turf in your lawn. Ascochyta affects several different turfgrass species throughout the northern United States, with most damage occurring during the summer months. Ascochyta infections can be identified by large, uniform areas of affected turf turning straw colored. In some instances, “pockets” of infection may cause a patchy appearance in a lawn or landscaping area. Closer examination of the turf will show healthy leaves and infected leaves interspersed.
Rust Rust appears as an orange or yellowish-orange powder (spores) on grass leaf blades, especially in late summer to early fall when the weather is dry. Rust typically develops on lawns and other turf areas growing very slowly. Overall, the turf may assume a yellow, red, or brown appearance. Close examination will reveal the pustules, which easily rub off on your hand. Rust spores can easily be tracked into homes. Orangish rust spores are visible on leaf blades of a grass plant. Low fertility (in particular nitrogen) and low water availability slow down turf growth, allowing rust to develop. Seasons with excess rain may have rust outbreaks due to depletion of available nitrogen. Cool nights with heavy dew and light, frequent rainfall add to the ideal conditions for rust to develop.
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