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Bruchus pisorum (L.)
Insecta, Coleoptera, Bruchidae .

Pea beetle

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


[R]Description
- Adult: 4.0 to 4.5 mm. Quadrangular pronotum 1.5 times wider than long, slightly wider at the base. Brown elytra speckled with whitish and reddish spots. Whitish pygidium with two large black spots. Posterior femur with a tooth on the innerside parallel to a strong tooth on the external side (*) .
- Egg: 0.6 mm long, bright yellow.
- Larva: narrow first-instar larva, 1.2 mm in length, bearing legs. The 2nd-instar larva reaches 5 to 6 mm once its development is complete; slightly curved inwards, apodous, brown head, yellowish white body.

[R]Biology
- This beetle, stricly monophagous, develops only on pea.
- After hibernation inside stored grains or in various other shelter, the adult flies away in search of pea crops and can thus cover several kilometres. It feeds on pollen and pea petals for a few days and then mates. Average fecundity: 400 eggs, laid singly on the pods about to reach their final length.
- Egg: embryonic development lasts about 10 days.
- Larva: once it has hatched, the 1st-instar larva goes through the pod wall, penetrates inside a seed and moults. The 2nd-instar larva continues its development in the seed for 40 to 45 days. Before it pupates, it cuts in the wall of the grain a circular operculum to enable the adult's exit (*) . There is a single individual per seed.
- Pupa: pupation lasts on average 10 days when the atmosphere is not too dry.

[R]Life Cycle
- Univoltine beetle.
- The adults develop during August, in the stored seeds. Most of them remain quiescent until the next spring. Activity resumes, in France, end of May-beginning of June.

[R]Damage
Peas attacked by the beetle are not suitable for consumption and cannot be used for sowing, the germination capacity of the seeds having been reduced.


[R]Common Names
DE: Erbsenkäfer ES: Gorgojo del guisante FR: Bruche du pois IT: Tonchio del pisello PT: Gorgulho da ervilha GB: Pea beetle

[R] Images

  1. Bruchus pisorum (L.) (Coutin R. / OPIE)
    Seeds attacked by bruchid In each seed, the location of the eventual emergence hole for the adult made by the larva is visible.
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  2. Bruchus pisorum (L.) (Coutin R. / OPIE)
    Recently emerged adult, on attacked seeds

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