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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

[R]Description
- 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.

[R]Biology
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.

[R]Damage
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.

[R]Remark/A>
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.
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  2. Dasineura tetensi (Rübsaamen) (Coutin R. / OPIE)
    Damage on black currant Twisted shoot, crinkled and necrosed leaves.
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  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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