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

Pear-shaped pea weevil

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

- 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.

- 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.

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

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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