Palmetto. This is a tiny insect that pierces through the grass with needle-like mouth parts and sucks out the juices. Brown patch affects all types of grass, but is most common with St. Augustine. The disease was named for the distinct symptom it produced. For example, downy mildew appears as white or … Raleigh St. Augustine grass was well received by sod growers in the southeast of Florida. Chinch bug saliva is toxic to the grass and will only accelerate the damage. sources enhance disease severity, as does compacted soil. 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. Also, visit Michigan State University's Turf Disease identifier . Diagnosing Lawn Disease: Photo Gallery Harmful microorganisms are lying dormant in lawns across America. St. Augustine grass should only be watered once it is dry and showing signs of drought, typically every 5- 10 days. Application of the herbicide atrazine increases the susceptibility of St. Augustine grass to this disease. The recommended depth to water St. Augustine grass is 4- 6 inches. Lawn diseases. Check out my ultimate guide to St Augustine grass. Insects That Damage St. Augustine Grass. The propagation of St. Augustine grass is usually vegetative through stolens, plugs and sod. This is a native St. Augustine grass chosen for better texture and color than more common St. Augustine grasses. During the summer, St. Augustine grass always has a few spots, but the overall health of the turfgrass is not affected unless the grass is placed under severe stress. Our lawn experts find that the Raleigh variety seems to be the most susceptible to the disease. This grass has superior heat, shade, drought, cold, and frost tolerance. We left for to visit family on the East Coast and when we returned we saw large brown spots of dead tan-colored grass… St. Augustine grass is semi-drought tolerant, and does best when watering is done only as needed. A few other fungal diseases sometimes affect St. Augustine grass, but the effects aren't normally severe. With St. Augustinegrass, brown patch can look like a brownish interior patch with a yellow outer ring. 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. We laid down St. Augustine grass in the backyard. St. Augustine grass seed has not traditionally been easy to establish but new methods have made seeding a viable option. St Augustine Grass Insect and Disease Problems. The major pest of St Augustine grass is the chinch bug. 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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