July 29, 1992
The white grubs that routinely damage lawns and turfgrass in Iowa are the annual white grubs. These grubs take just one year to complete each life cycle of egg - larva - pupa - adult. The adult beetles of our annual white grubs are called masked chafers. They are slightly smaller than Junebugs and tan or straw brown in color. As the name implies, they have a black stripe across the eyes and face. The masked chafers have been flying and laying eggs for most of the month of July. Like other things, they were about one week behind normal in their emergence and activity this year.
The best time to seed lawns in Iowa is fast approaching. Generally, seeding should be done from mid- August to mid-September. Careful planning and hard work are necessary to successfully establish a new lawn.
Late summer or early fall planting has several advantages over spring seeding. The cool-season grasses will germinate quickly in the warm soil of late summer. The warm fall days and cool nights promote rapid turf growth. There will also be less competition from weeds as fewer weed seeds germinate in the fall.