Acanthoscelides obtectus (Say)
Primary pest; Grain feeder
- Adults are 3 to 4 mm long, globular in shape with long legs.
- Elytra do not reach the end of the abdomen, leaving the last terga exposed.
- Last upper abdominal segment is covered with yellowish hair (setae).
- Inner ridge of the ventral margin of the hind femur has three or four "teeth".
- Larvae are white and grub-like, having reduced legs.
- Pea weevil (Bruchus pisorum)
- Beans, broad beans, lentils, chickpea, soybean
Signs of infestation
- Damaged seeds with entrance or exit holes
- Damage is distinctive with tiny dot-like entrance holes and larger, round exit holes and excavated seed.
- Large populations may reduce stored seed to dust.
How to control
- Is distributed worldwide
- Is distributed across Canada
- Primarily attacks stored beans but may attack plants in the field
- Establishes well in heated storages and granaries
- Adult bean weevils feed on bean plant foliage and seed pods.
- Females lay eggs inside the seed in storage or lays multiple eggs on the surface of a pod in the field.
- Larvae develop in growing or stored bean seeds.
- After pupation within the seed, the adult chews an exit hole through the seed coat.
- In heated storage conditions, the adult bean weevil can emerge at any time of the year and breed continuously.
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