White Grubs

Various species

  1. Symptoms: White grubs can partially or completely sever the roots of the host plants. This causes patches of wilting and dying wheat plants (especially at the seedling stage), symptoms that could be attributed to root rots. However, when stunted patches are observed, the surrounding soil should be examined for the larvae (picture at left). When fully grown, the largest of these larvae may be several centimeters long and nearly one centimeter thick. The larvae have three pairs of legs on their thorax (picture at right).
  2. Life Cycle: White grubs are the larvae of May or June beetles. Eggs are deposited in the soil and the hatched larvae feed on roots. The duration of the larval stage varies from species to species.
  3. Hosts/Distribution: Many species of white grubs found throughout the world can attack wheat and many other plant species. Cereal crops may suffer significant damage if seeded into heavily infested grasslands.
  4. Importance: When the roots are not completely destroyed, the plants may survive, but are stunted and fail to produce spikes. However, the distribution and extent of attack is not uniform.

White Grubs White Grubs