More Lawn Diseases...

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This article provides helpful tips for how to identify and control lawn diseases
by Brett · All Zones · Lawn Care · 0 Comments · June 17, 2013 · 12,229 views

SnowmoldSnowmold lawn disease

Snowmold is most common to Bluegrass and Fescues in regions where snow falls and sits on the lawn for extended periods of time.

Prevention: The best prevention for snowmold is to aerate often. Improving water drainage, raking leaves off lawn's surface, and avoid fertilization in the late fall.

Control: The most common fungicide used on Snowmold is Benomyl.


Spring Dead SpotSpring Dead Spot lawn disease

Nearly all Bermudagrass varieties are affected by spring dead spot, especially in the cooler parts of the transition zone. Other grass types are affected, but this lawn disease is primarily a problem with Bermuda varieties. As the name suggests, spring dead spot usually appears in the spring as circular patches of bleached dead grass. It becomes visible as the surrounding dormant turf resumes its normal spring growth. These patches range from a few inches to several feet in diameter and tend to show up and expand in the same locations for several years, and then disappear after three to four years. The fungi appear to grow most actively in the fall and spring when temperatures are cool and the soil is fairly moist.

Even though damage begins in earnest in the fall, damage is masked by the turf's normal dormancy over winter. This lawn disease is most commonly found on mature and well maintained turf, and is much less serious on lawns receiving little or no fertilization.

Prevention: Prevention and treatent for spring dead spot includes carefully controlling the amount of nitrogen fertilizer applied to the turf, since high nitrogen levels increase activity.

Control: Fungicides must be applied during the fall months to fend off extreme root and stolon rot over the winter months. Contact type fungicides can be used with some success, but must be applied repeatedly. On the other hand, systemic lawn treatment fungicides that are actually taken into the plants, such as Thiophanate, can be applied once in the fall at heavy rates to help control the disease the following spring.

SEE: How To Control Spring Dead Spot In Bermudagrass Lawns


Summer Patch / Fusarium BlightSummer Patch / Fusarium Blight lawn disease

Summer patch has been reported on species of bluegrass and fine fescues, such as creeping red. Summer patch, however, has not been reported in creeping bentgrass, perennial ryegrass, or tall fescue. It may be confused with anthracnose, heat stress, insect damage, necrotic ring spot, nematode damage or southern blight. On Symptoms first appear in early summer as small, circular patches of slow-growing, thinned, or wilted turf 1-3 inches in diameter. Patches are typically less than 1 foot in diameter, but they sometimes exceed 2 feet. Affected leaves rapidly fade from a grayish green to a light straw color during sustained hot weather. Irregular patches, rings, and crescent patterns may also develop and ultimately coalesce into large areas of irregularly patterned blighted turf. Infected roots, rhizomes, and crowns turn dark brown as they are killed.

Prevention: Apply nitrogen to chronically affected bluegrass and creeping red fescue in the fall. Avoid spring and summer nitrogen applications, especially in increments greater than 0.25 lb per 1000 sq. ft. Avoid the use of nitrate-based fertilizers since nitrate nitrogen has been shown to enhance disease severity. Use slow-release fertilizers such as natural organic sources or sulfur-coated urea. Mow higher during summer. Improve drainage where needed. Core aerate compacted soils regularly.

Control: Benzimidazole and Thiophanate fungicides have been reported to offer some curative and systemic effect.


Slime MoldSlime Mold lawn disease

Like powdery mildew, slime molds covers grass with a powdery covering that looks almost like crystallized whitish to greyish frost, sometimes ash-like in appearance It feeds on decaying organic matter found in the soil. As the powdery covering becomes thicker, it reduces the light reaching the plant cells, and they begin to turn yellow.

Prevention: No prevention. Usually not harmful.

Control: In some cases, the grass blades can be hosed off with a forceful stream of water.





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