If the disease has been active for a long time, the inside of the patch may recover, leaving a ring of dead or thin grass around it. The recommended depth to water St. Augustine grass is 4- 6 inches. Diagnosing Lawn Disease: Photo Gallery Harmful microorganisms are lying dormant in lawns across America. Application of the herbicide atrazine increases the susceptibility of St. Augustine grass to this disease. Brown patch affects all types of grass, but is most common with St. Augustine. This is a tiny insect that pierces through the grass with needle-like mouth parts and sucks out the juices. Chinch bug saliva is toxic to the grass and will only accelerate the damage. Lawn diseases. With St. Augustinegrass, brown patch can look like a brownish interior patch with a yellow outer ring. The major pest of St Augustine grass is the chinch bug. St. Augustine grass is semi-drought tolerant, and does best when watering is done only as needed. Insects That Damage St. Augustine Grass. The disease was named for the distinct symptom it produced. This grass has superior heat, shade, drought, cold, and frost tolerance. If you don’t know the grass varieties in the lawn, you can still click through the disease list and look for symptoms and photos. We left for to visit family on the East Coast and when we returned we saw large brown spots of dead tan-colored grass… For example, downy mildew appears as white or … We laid down St. Augustine grass in the backyard. Our lawn experts find that the Raleigh variety seems to be the most susceptible to the disease. Raleigh St. Augustine grass was well received by sod growers in the southeast of Florida. Check out my ultimate guide to St Augustine grass. Palmetto. Mosaic disease of St. Augustinegrass was first reported in the 1960s in sugarcane producing areas of Florida (rural Palm Beach County). A few other fungal diseases sometimes affect St. Augustine grass, but the effects aren't normally severe. sources enhance disease severity, as does compacted soil. This is a native St. Augustine grass chosen for better texture and color than more common St. Augustine grasses. Also, visit Michigan State University's Turf Disease identifier . The propagation of St. Augustine grass is usually vegetative through stolens, plugs and sod. St Augustine Grass Insect and Disease Problems. Various diseases can be the reason why your grass is dying or appearing as though it is dead. All it takes is a change in weather -- a warm, wet or dry spell -- for your green grass … St. Augustine grass should only be watered once it is dry and showing signs of drought, typically every 5- 10 days. St. Augustine grass is prone to some diseases such as brown patch disease, gray leaf spot, and take-all root rot.. 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