They are early this year, but that may be a result of all that warm weather last week. The lawn pests are probably sod webworms that are feeding very briefly and will be pupating. There is no need to spray the sod webworm because they will not be doing damage this time of year. The cutworms however are doing damage and should be controlled. Black turfgrass ataenius flights have remained heavy over the last week.
Peak egglaying occurs when horse chestnut and bridal wreath spirea are in full bloom.
These plants are now in full bloom in the Guelph area. It is probably too late for preventative treatments of ataenius with products like diazinon and chlorpyrifos. For curative treatments, look for small grubs when the roses are in full bloom. Crabgrass has germinated over the last week in open areas as a result of the heat and the rain. With Dimension you can apply until the crabgrass is in the 1-4 leaf stage.