The larvae approach maturity about October. Adult Phyllophaga emerge from the ground from April to August depending on species. Adults of the annuals emerge from the soil June through July. Little feeding appears to take place during the winter or early spring. Rear end of body often slightly larger in diameter than rest and may be bluish or blackish in color.
White grubs have a brown head capsule and three pair of conspicuous legs.
Treat when 15 or more larvae are found per square yard. Ornamental and Lawn Pest Control .