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Close inspections reveal that white grubs are the cause of the problems.
Of various turf insect pests, white grubs are best known, given their widespread distribution within Kansas and the frequency with which they occur. White grubs are larval stages of scarab beetles with approximately 1,500 species in North America. Nearly 200 species are found in Kansas, but only a few species are considered of economic importance. Exact species determinations have not been made, but considered opinion is that southern masked chafers, Cyclocephala lurida Bland, are the predominant turf pest in Kansas. Southern Masked Chafer Life Cycle.