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Bruchus rufimanus (Boheman)
Insecta, Coleoptera, Bruchidae .

Bean beetle

Description, Biology, Life Cycle, Damage, Common Names, Images

- Adult: 3.5 to 5 mm. Prothorax a little shorter than wide, anterior legs entirely yellow, middle and posterior legs black. Posterior tibias bearing a long spike on the internal angle. Pale grey pygidium, reddish white pronotum (*) .
- Egg: 0.6 mm long, greenish yellow.
- Larva: the 2nd-instar larva reaches 5 to 6 mm once its development is complete; arched, apodous, brown head, ivory white body.

- Relatively polyphagous beetle, attacks broad bean but also pea and bean.
- After hibernation, the adult flies towards the host crops, consuming the pollen and the petals. After a few days, it mates. The female lays its eggs singly on the pods.
- Egg: embryonic development lasts on average 13 days.
- Larva: once it has hatched, the 1st-instar larva enters the pod, penetrates a seed, then moults into a 2nd-instar larva. Larval growth lasts 3 months after which the larva cuts a circular operculum in the grain's wall which will enable the adult to emerge (*) , and then pupates.
- Pupa: pupation lasts 10 to 15 days.

[R]Life Cycle
- Univoltine beetle.
- The most precocious beetles abandon the seeds once the plants start to ripen or when crops dry in the fields, and then hibernate in various kinds of shelter; the slower-developing individuals remain in the seeds until the next spring. Activity resumes, in France, at the end of May.

The presence of beetles in the seeds of broad beans, peas or beans renders them unsuitable for consumption, reduces the germination rate of the sowings and presents a risk of re-infestation of crops. One broad bean can harbour 5 to 6 individuals.

[R]Common Names
DE: Pferdebohnenkäfer, Ackerbohnenkäfer ES: Gorgojo del haba FR: Bruche de la fève IT: Tonchio della fava PT: Gorgulho da fava GB: Bean beetle

[R] Images

  1. Bruchus rufimanus Boheman (Coutin R. / OPIE)
    Adult emerging from an attacked bean
  2. Bruchus rufimanus Boheman (Coutin R. / OPIE)
    Damage on field bean seeds The adults emergence holes are visible.

To read this page in French

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