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Apion pisi (F.)
Insecta, Coleoptera, Curculionidae .

Pear-shaped pea weevil

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


[R]Description
- Adult: 2.5 to 3.5 mm, black ovoid body, except the elytra, slighty shiny metallic blue. Black legs and antennae. The male rostrum is shorter than the head plus the prothorax; that of the female longer (*) .
- Larva: arched, white.

[R]Biology
- The adults are found on various leguminous plants but the larvae feed on lucerne, much more rarely on pea, clover, sainfoin.
- Adult: has a period of summer diapause and becomes sexualy mature from September onwards. It feeds on young shoots of the host plant. Average fecundity, 30 eggs.
- Egg: inserted singly in the buds. Length of embryonic development, 1 week.
- Larva: 3 larval instars. Following egg hatch remains in the egg-laying cavity and feeds at the expense of the bud for 20 to 25 days. After the second moult, (passage to the third larval instar), it builds inside the bud a rigid pupal cell which serves to protect the pupa in spring and as a shelter during the winter for the larvae in a pre-pupal state.
- Pupa: the length of pupal development is about 15 days.

[R]Life Cycle
- Generally 1 generation per year.
- The larvae of the last instar hibernate inside the buds and pupation takes place at the end of winter.
- From June to September, there is a period of imaginal diapause (aestivation).
- The reproduction period is very protracted: from September to June with a pause during very cold periods. Until November, the eggs are deposited in the buds of the stems during the "boot" stage and principally in the terminal buds; in spring, the eggs are concentrated in regrowth. It is in these that the development of the larvae can cause the most damage.

[R]Damage
The larva eats the inside of the terminal buds which causes a delay in the start of growth of spring vegetation.

[R]Remark/A>
Apion pisi is particularly well adapted to the climatic conditions of the South-West of France.


[R]Common Names
DE: Erbsenrüssler, Luzerneknospenrüssler ES: Apion de las brotes, apion del guisante FR: Apion des bourgeons du pois, Apion du pois IT: Apione delle leguminose PT: Apion dos gomos GB: Pear-shaped pea weevil

[R] Images

  1. Apion pisi (F.) (Carré S. / INRA Lusignan)
    Adult on alfalfa

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