What we could be seeing in the landscape are damages from fertilizing and using herbicides during the wrong time of year. When plants are dehydrated and heat-stressed, they are not able to absorb the chemicals adequately and can die.
Reading the manufacturers' instruction label is critical for all chemical applications. The label will tell you explicitly "Do not apply this product to turf under stress from drought, insects, disease, cold temperatures, high temperatures of above 85 degrees."
Don't have the label? Here's a great site to look up MSDS sheets: CDMS Agro-Chemical database.
Father's Day coming up - let him take a break from yardwork. Tell him that for the next two months he doesn't need to fertilize or spray pesticides and you'll mow the lawn for him! Keep the grass cut high at 3-4 inches. Another great Father's Day gift is to have the lawn mower blades sharpened. He'll be able to get through that thick St. Augustinegrass. Sharp lawn mower blades keep the grass blades cut evenly, which means less susceptibility to pest problems!
If you have missed any of the last month's "In Your Backyard," you can find them at http://www.wlbe.org/ and click on the Past Shows.
Listen and call in with your gardening questions today at 11:06 am! Tell me what's going on in your backyard!