Pea weevil

Bruchus pisorum (Linnaeus)

Classification

Primary pest; Grain feeder
Order: Coleoptera
Family: Chrysomelidae
Acronym: BPI

Description

  • Adults are 6 to 7 mm long, globular in shape with long legs
  • Elytra do not reach the end of the abdomen, leaving the last terga exposed
  • Last abdominal terga is covered with black and white setae and the inner ridge of the ventral margin of the hind femur has a single spine
  • Larvae are white and grub-like, having reduced legs

Images

Similar species

Commodities affected

  • Peas

Signs of infestation

  • Damaged seeds with entrance or exit holes as described in “Damage”

Damage

  • Damage is distinctive.
  • Both adult and larvae feed on the inside of seeds.
  • Feeding causes tiny, dot-like entrance holes.
  • Feeding also causes larger, round exit holes with a diameter of 2.5 mm and excavated seed.
  • Large populations may reduce stored crop to little more than dust.

How to control

Geographic range

  • Is distributed worldwide
  • Is distributed across Canada

Where found

  • Weevils attacks peas that are grown in gardens and fields.
  • Infestation results in seeds that may not germinate or produce weak plants.
  • Weevils cannot persist in storage as they cannot re-infest stored seed.
  • Main sources of pea weevil are broken peas, volunteer peas and stored infested seed.

Life history

  • Females lay eggs on outside of pod.
  • Larvae develop in growing seeds within pods.
  • Larvae develop in growing or stored bean seeds.
  • After pupation within the seed, the adult chews an exit hole through the seed coat.

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