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Hoplocampa minuta (Christ), {Hoplocampa flava L.}
Insecta, Hymenoptera, Tenthredinidae .

Black plum sawfly, Yellow plum sawfly

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

- Eggs: kidney-shaped, elongated and transparent.
- Larva: 9 to 11 mm long, cylindrical, slightly curved, white to yellowish-green. Three pairs of stout thoracic legs and 7 pairs of abdominal prolegs.

- Host plant: plum.
- Adult: longevity of females, 8 to 15 days. Feeds on nectar and pollen. Inactive at low temperatures (*) .
- Total fecundity: 50 to 60 eggs.
- Eggs: time until hatching, 10 to 14 days.
- Larva: 25 to 38 days; 4 moults.

[R]Life Cycle
- 1 generation per year; the life-cycle occasionnaly extending over 2 years.
- When the last petals are dropping, the larva hatches, leaves the calyx and penetrates the fruit where it digs a gallery to the kernel which it eats (primary attack). A secondary attack takes place on other fruits (3 or 4). When fully fed, the larva drops to the ground where it constructs a cocoon by sticking tiny particles of earth together. It remains in diapause at a depth of 5 to 8 cm until the end of February, and then pupates.
- Pupation in spring.
- The adults appear in March-April, mate and lay eggs in the blossom. The female digs a hole in the calyx and deposits an egg inside; this grows and causes a swelling in the epidermis.

All infested fruit drop prematurely. The primary attacks affect fruits which are only 4 to 5 mm long. The secondary attacks, 10 to 15 days later, affect fruit which could be the size of an olive. Each fruit bears 1 or 2 characteristic holes and smells like a stinkbug when opened (*) .

[R]Common Names
DE: Schwarze Pflaumensägewespe, Gelbe Pflaumensägewespe ES: Hoplocampa negra, Hoplocampa común del ciruelo FR: Hoplocampe noir du prunier, Hoplocampe commun du prunier IT: Oplocampa delle susine PT: Hoplocampa da ameixa amarela GB: Plum sawfly, Black plum sawfly, Yellow plum sawfly

[R] Images

  1. Hoplocampa minuta (Christ) (ACTA)
    Larva and adult female
  2. Hoplocampa minuta (Christ) (ACTA)
    Damage on young plum On the left, fruitlet with exit aperture of a larva; on the right, sectioned fruit containing a larva.
  3. Hoplocampa minuta (Christ) Ovipositing Female adult ovipositing into a plum blossom (a); oviposition scar in flower calyx (b).

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