Grubs are the larval stage of various beetles. Most are C-shaped and feed on the roots of various plants. Grub heads are brown; their hind end is a dark gray color and covered with hairs (used for identification).
Lawn grubs are usually one of three types - annual white (from June beetles), true, and aetenius. The annual white types typically cause the most problems.
Annual white grubs emerge as adults in late June, depending on weather conditions. Eggs are laid in moist soil, near sidewalks or driveways or under night lights around the fourth of July. Eggs hatch during the first week or so in August. Grubs feed on grass roots.
Large, dead patches in late summer may be an indication of grubs. Only inspection under the dead turf can indicate grub presence. Control may be necessary if twelve to fourteen grubs per square foot are found in an actively growing lawn. If the lawn is dormant or less than active or dormant, fewer grubs may be needed to cause noticeable injury to the turf.
Dead grass killed by grubs comes up "like carpet" if pulled. Effective control can only be accomplished if treated early in their development cycle (usually late July to August). Once the grubs become full size (early spring) it’s usually too late to control them. Grubs frequent the best looking lawns, which tend to be more suitable for egg laying.
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