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