The frequent rains have triggered lots of mushroom growth in all types of lawns. 
Mushrooms are associated with arc-like or circular patterns in turf grass called fairy rings. The ring pattern is caused by the outward growth of fungal mycelium. It forms a dense, mat-like structure in the soil that decomposes organic matter and increases a form of nitrogen, which causes excessive green growth. This results in growth at the outer edge of the ring and releases toxins that can lead to dieback of the turf close to the ring.  Fairy rings are sometimes difficult to control.
    Other mushrooms in the lawn are not associated with fairy rings. These may be mycorrhizal (a symbiotic association with tree roots) or saprophytic. (These live on dead organic matter such as wood, etc., in the soil.) Because some of these types of mushrooms are beneficial, you really do not want to kill them.
    Fungicide applications do little good to control mushrooms, because the mushroom itself is simply the fruiting structure. Most of the fungus is below ground and inaccessible to the chemical. If the mushrooms are really causing a nuisance in your yard, the best control is to pick them and dispose of them as soon as they appear. Some control can also be gained by removing large sources of organic debris from the soil. Mushrooms will tend to go away on their own as soon as the soil has a chance to dry out. Never eat mushrooms unless you are sure of their identity!
    For more information on mushrooms and mushroom control, contact the Ford County Extension Office at 620.227.4542 or e-mail me at aburns@ksu.edu.