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Coenorhinus aequatus (L.)
Rhynchites aequatus

Insecta, Coleoptera, Rhynchitidae .

Apple fruit weevi, Apple fruit rhynchites

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


[R]Description
- Adult: 2.5 mm long, prothorax bronzed, furrowed in the middle; elytra red or yellow, with generally dark suture, striae and tubercules of the elytra very distinct (*) .

[R]Biology
- Host plants: apple, plum.
- Adult: it overwinters under bark flakes and various other shelter and becomes active early in the spring. It feeds by biting the buds, the shoots, the flowers and especially the young fruitlets (*) .
Average fecundity, 20 eggs. These are deposited individually in the fruitlets at the bottom of a small cell that the insect forms with its rostrum (*) ; then the female partially gnaws the peduncle, which reduces sap circulation.
- Larva: it develops during the summer in the fruit which drops prematurely; in autumn, it leaves the fruit and pupates in the ground.

[R]Life Cycle
- 1 generation per year.

[R]Damage
The feeding punctures of the adult cause a marked deformation of the fruit (*) . In addition, the fruitlets containing a larva, and of which the peduncle has been partly cut by the female during egg laying, drops prematurely.


[R]Common Names
DE: Rotbrauner Apfelfruchtstecher ES: Rhynchitus rojo del manzano FR: Rhynchite rouge du pommier IT: Rinchite dei frutti PT: Rinquito vermelho da macieira GB: Apple fruit weevi, Apple fruit rhynchites

[R] Images

  1. Coenorhinus aequatus (L.) (Coutin R. / OPIE)
    Adult on an apple leaf
  2. Coenorhinus aequatus (L.) (Coutin R. / OPIE)
    Healed bite marks caused during spring feeding
  3. Coenorhinus aequatus (L.) (Coutin R. / OPIE)
    Growth defects The cross-section of the apple shows the location of the spring feeding bites.
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  4. Coenorhinus aequatus (L.) (Coutin R. / OPIE)
    Egg in an apple frutlet Surface cross-section of the epidermis showing the oviposition gallery and egg.
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