Pre-emergence Time

The recent wet weather in certain area has started producing some dieback from fungal growth. Early detection and treatment is critical to minimize lawn damage. Reports of take-all root rot are on the rise with the increased soil moisture. This fungus attacks the root system and often kills the roots causing irregular brown areas of dead grass. Roots can also be stunted causing dieback later in the year if the grass is water-stressed.

If you suspect lawn fungus, take time to rake to remove the thatch buildup from the summer caused by decaying grass clippings. Rake the healthy areas first, then move to the dead parts so you don’t spread the fungus. Spraying with a fungicide labeled for take-all root rot also can help protect the green grass nearby the dead spots. Fungicides will slow down the fungal growth, but severely affected areas may not recover quickly.

Also, realize that if the stolons or above ground stems of a patch of St. Augustine grass are brown, they are dead and that grass will not grow even if you apply fungicides. St. Augustine varieties do not have roots or stems underground that allow them to recover from this disease. You probably will have to resod.

Another option that will help is to aerate the ground, basically poking holes several inches down. Afterward, apply about a quarter inch layer of either peat moss or Hu-more. Research shows these products help by creating a more acidic soil for new root growth.

MUSHROOM ATTACK
Mushrooms are another fungus seen during the rainy season. Fairy rings are mushrooms that grow in a circular pattern that expands out each time they emerge. In some cases, you may see only a semicircle, but a distinct rounded line pattern is usually present.

These mushrooms will not harm your yard but may be unsightly. Kick off the mushroom caps before they expand and release spores. The tops will wither in the sun in about a day or your can dispose of them in the trash can.

PREVENT WINTER WEEDS
As temperatures cool, you will see slower grass growth and faster broad-leaved weed growth. That is why clovers and dandelions become so prolific in the winter. If these types of weeds have been a problem, you should plan to apply a pre-emergent herbicide in October and again in December or January, which should help prevent these pesky weeds from getting the upper hand.

Remember that pre-emergent herbicides either prevent seeds from germinating or kill off the very small weeds. It doesn’t work on established weeds, so early application is important to prevent a yard full of burr clover.

Do your research either online or at your local full-service nursery to see what products will meet your needs.