I agree that grass and lawns contribute much to our environment. Even though grass maintenance requires some natural resource input, the returns are worth the expenditures. Except for bermuda and zoysia lawns, postemergence weed control should have been attempted in early spring. High temperatures can cause excessive damage on other grasses even if they are listed on the herbicide label as tolerant. General home lawn broadleaf weed control can often be accomplished using selective postemergence formulations which contain two or more herbicides.
Formulations are available for most southern grasses.
Most labels will stress use on younger weeds growing in the cooler mid-spring to early summer period. A temporary discoloration of the lawn usually occurs. Repeat application in 2-3 weeks. Avoid drift, keep away from gardens and clean sprayers thoroughly with ammonia. For bermuda or zoysia lawns, weed killer with MSMA or DSMA often provide a wide spectrum of selective control for mostly grassy and some broadleaf weeds in June through August.