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Dasineura tetensi (Rübsaamen)
Insecta, Diptera, Cecidomyiidae .

Black currant leaf midge, Black currant midge

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

- Adult: 1.5 to 2.0 mm long. Brownish thorax, honey yellow abdomen with blackish dorsal stripes.
- Eggs: laid in several clusters (groups of 4 to 5), 0.25 to 0.30 mm x 0.70 mm, whitish.
- Larva: white at first, then slightly orange, 2.0 to 2.5 mm long.
- Pupa: 2 mm long, in a cocoon formed in the ground at a superficial depth.

Black currant is the only host plant.
- Eggs: they are laid in the folds of the youngest leaves before these open out.
- Larva: development lasts 10 to 20 days. They overwinter and pupate in cocoons formed in the ground.
- At each generation, some of the larvae enter diapause in their underground cocoons; others pupate and develop into adults which produce a new generation. The number of larvae entering diapause increases from generation to generation. All the larvae of the third generation enter diapause.

[R]Life Cycle
- 2 to 3 annual generations, from April to August; sometimes a fourth on cultivars producing young vegetation into September.
- The emergence of the spring adults, in April, generally coincides with the start of flowering. The other adults emerge at the end of June and at the end of July-beginning of August.

Damage consists of shrivelling up (*) , crinkling, twisting and malformation of the leaves (*) accompanied by twisting of the shoots (*) , the growth of which is slowed down.
The damage is serious in nurseries and in young plantations.
Differences in sensitivity have been noticed: thus, the cultivars of the Goliath group are more prone to attack than others. Such damage should not be confused with the symptoms of black currant reversion.

Unknown in France before 1963, Dasineura tetensi was discovered in the Rennes region on plants imported from Holland during the previous year.

[R]Common Names
DE: Johannisbeerblattgallmücke ES: Cecidómido de los brotes del grosellero negro FR: Cécidomyie des pousses de cassissier IT: Cecidomia del ribes nero PT: Cecidomídeo dos rebentos da groselheira preta GB: Black currant leaf midge, Black currant midge

[R] Images

  1. Dasineura tetensi (Rübsaamen) (Coutin R. / OPIE)
    Damage on black currant Leaves becoming crinkled. Larvae present in folds.
  2. Dasineura tetensi (Rübsaamen) (Coutin R. / OPIE)
    Damage on black currant Twisted shoot, crinkled and necrosed leaves.
  3. Dasineura tetensi (Rübsaamen) (Coutin R. / OPIE)
    Damage on black currant Consequences of spring attacks by larvae : twisting of stem and crazing of bark the following spring.

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