September 1 - October 15
A broadcast spray treatment consisting of a pre emerge product focusing on preventing the germination of poa annua in the spring will be applied. Poa annua is the most problematic weed during the spring. Prevention with this treatment is key as it is more difficult to control once it has emerged. Additional weed control products will be used to control sedge, spurge, and other weeds that have germinated.
The timing of this spray is very important and the products need to be watered in to activate. However, we often receive little rainfall. There is a good chance irrigation will be needed. If rainfall has not occurred within 14 days be sure to water with ½ -1 inch of irrigation to be sure the products are washed into the soil. Irrigation of grass is also important during this period as the lawn prepares for dormancy. A lawn that enters dormancy healthy without battling factors such as drought is likely to be healthier during the spring with less chance of winter damage issues. Mowing should still occur regularly but less frequently as the temperatures begin to cool. Growth of grass has slowed so scalped grass during this time frame that is turned tan from mowing will most likely remain tan for several weeks or the remainder of the season. Raise the mowing height a bit now to be sure grass remains green after a cut. The first frost typically occurs in early November. This will cause lawns to turn brown. During this process unusual patterns will be left green. This is often confused with a disease.