July 12, 2021
During early June we received several photos of dying lawns while neighboring lawns looked healthy and green.
Ascochyta leaf blight is the disease causing these problems. It causes large irregular patches of turf to quickly turn straw-brown in color and appear dead. From a distance the symptoms resemble drought stress. Ascochyta symptoms can appear as quickly as overnight. Infected leaves present a bleached tip dieback and the margin between healthy and disease shows a slightly pinched appearance. Some leaves may have uniform lesions affecting the entire leaf blade.
Ascochyta blight occurs on drought-stressed turf and also during periods of hot weather preceded by wet conditions. Manage the disease by reducing thatch by annual core aeration to allow better water penetration. Maintain grass height at 2.5 and 3 inches and reduce mowing frequency. Turf may look dead from a distance, but the blight does not affect bluegrass crowns and roots, so grass will recover in a matter of weeks depending on weather conditions.
Several lawns where the disease was observed have already shown quick recovery aided by the recent rainfalls that followed the weather events that incited the disease. For more information about this disease and questions and answers, please refer to the Iowa Turf Blog in the link below.
Mulching has many benefits, but it must be applied correctly. We recommend maintaining a two- to four-inch layer of mulch in all areas where there are plants.
A winter filled with constant freezing and thawing throughout the season can have a negative impact on a lawn.
Winter is usually a time when people think about what they will do in their yard once the snow melts.
With lawns covered in snow they seem a bit 'out of sight out of mind,' but that shouldn't be the case! Here are a couple things to consider when it comes to your lawn in winter.