Your first line of defense against weeds, diseases and other pests is a good dense turf. No lawn is immune to these pests, but they needn't spoil the uniformity and appearance of your turf. Here's what to do.
Roberts, Eliot C.; Shurtleff, Malcolm C.; and Gunderson, Harold
"Stop Lawn Pests!,"
Iowa Farm Science: Vol. 14
, Article 2.
Available at: http://lib.dr.iastate.edu/farmscience/vol14/iss12/2