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Fuller's rose weevil

Date: 16 Feb 2005   Author: Jianhua Mo, Sandra Hardy

Description

Fullers rose weevil

  • Adult fuller's rose weevils are wingless, grey-brown, and about 8 mm long.
  • Mature larvae are legless, yellow and about 6 mm long.
  • Females produce eggs glued together in yellowish, papery masses of about 20-30 without mating.
  • Eggs are laid under fruit calyces, in bark crevices, or in microsprinklers under the tree.
  • After hatching, the larvae drop to into soil and feed on citrus roots.
  • Adults then emerge from the soil mostly between February and May. They climb trees via trunks, weeds and low-hanging foliage.
  • The adults chew leaf margins, leaving a serrated edge.
  • Foliage near the trunk or touching the ground is most likely to be damaged.
  • There are 1-2 generations per year.
  • Adults can be found all year, but peak levels are from February to May.

Damage

  • The presence of eggs under the calyx may cause a problem in some export markets.
  • Fuller's rose weevil is a quarantine pest in South Korea. Orchards exporting to South Korea must have low levels of this pest and acceptable management practices in place.
  • Fuller's rose weevil attacks all citrus varieties.

Monitoring

Fullers rose weevil eggs monitor

  • Fortnightly monitoring is necessary from early August to late October, and again from February to late June.
  • Trees selected for monitoring must be randomly scattered throughout the block.
  • Examine low-hanging fruits near the trunk, looking for egg masses under the calyx.
  • Examine low-hanging foliage for signs of feeding damage.
  • The abundance of adult weevils can be monitored by beating tree limbs.

Natural enemies

  • Wasp Fidiobia citri
  • Assassin bug
  • Praying mantises
  • Parasitic nematodes (such as Heterorhabditis sp.)

Control measures

  • Control of Fuller's rose weevil is required especially for exporting crops.
  • Appropriate actions include pruning the skirts of trees at the end of each season, controlling weeds, and applying sticky bands around the tree trunk.