The appearance of yellow patches on a lawn is always cause for worry. The cause must be determined quickly in order to remedy the situation. Is the damage due to drought, insects, disease or something else?
Obviously, a lawn that is not properly watered will turn yellow during the summer months. Apart from being visually unappealing, this is completely normal and does not affect rooting. As soon as the lawn receives moisture, it will come back to life.
If, however, the lawn is watered and the patches do not turn green again, or the damage seems to intensify, there is surely a justifiable reason.
Listed below are some of the most common explanations.

1. Frost
2. White grubs
3. Chinch bugs
4. Sod webworms
5. Drought
6. Dog urine
7. Dollar spots