Generic filters
Exact matches only
Filter by Categories
Ant Information
Cockroach Bait
Cockroach Biology
Cockroach Control
Cockroach identification
Cockroach Information
Cockroach Spray
Cockroach Traps
Garden Pest information
Latest News - E-News
Latest News - General
Latest News - Magazine
Pest ID
PPM Magazine
PPM Pest E-News
Scientific Papers
Termite Professional magazine
Termite Professional Magazine - Asean
Termite Professional Magazine - Australia
Open to the Public
Other Pests
Pest Control Product information
Pest Pulse
Premium Blogs
Spider Information
Termite Information
Wasp Information
Filter by content type
Taxonomy terms

Lesser grain borer (Rhyzopertha dominca)

Lesser grain borer

Invasive. The origin of the lesser grain borer is unknown.

Found across Australia and worldwide


Larvae are a white and up to 3.0mm long. They are “straight” and mobile when young, but become more C-shaped and less mobile as they age.


The lesser grain borer is a cylindrical, reddish beetle, 2.5-3.0 mm long. The head is usually held downward, concealed under the thorax. The antennae is club-shaped with 3 segments.


Female beetles lay between 200-500 eggs during her life-time.

The life-cycle is completed in around 8 weeks. Larvae go through 4  instar stages before pupating.

Adults live for 2-3 months.

Lesser grain borers primarily target grain, but will also feed on processed grains – cereals, biscuits and spaghetti.

Both the adult and larvae feed and cause damage.

Lesser grain borers are the biggest pest of stored grain in Australia.


The lesser grain borer is a strong flyer.

Females lay their eggs loosely among the grains and the larvae borer into the grain.

Infested grain will give off a sweet smell.

  • Check all incoming food materials
  • Place all opened food stuffs in sealed plastic containers
  • Clear up any food spills

Monitoring and treatment notes:

Professional Pest Managers can login for more information