Oblique-banded dwarf ladybug

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Oblique-banded dwarf ladybug
Scymnus subvillosus2.jpg

Oblique-banded dwarf ladybug ( Scymnus subvillosus )

Systematics
Order : Beetle (Coleoptera)
Subordination : Polyphaga
Family : Ladybird (Coccinellidae)
Subfamily : Coccinellinae
Genre : Scymnus
Type : Oblique-banded dwarf ladybug
Scientific name
Scymnus subvillosus
( Goeze , 1777)
Oblique-banded dwarf ladybug

The oblique-banded dwarf ladybug ( Scymnus subvillosus ) is a beetle from the ladybird family , tribe Scymnini .

features

The smallest ladybirds belong to the Scymnini tribe. The oblique-banded dwarf ladybug reaches a length of only 1.9 to 2.5 millimeters. Its body is round and covered with short gray hair. Four reddish bands of variable widths stand out on the dark background of the elytra . The underside is black or dark brown, in the rear section red-brown. The oblique-banded dwarf ladybug can be confused with the related Scymnus quadripustulatus .

Occurrence

When oblique-banded Dwarf ladybug is a heat-loving kind in Southern Europe , in southern Central Europe and Southeastern Europe is widespread. In the east the distribution area extends to southern Russia and in the Mediterranean area to the Middle East .

The species has been found more frequently in Germany since 1990. Finds in the Elbe Valley could point to an area expansion to the north. Nevertheless, the oblique-banded dwarf ladybird is rare and is considered an endangered species in Germany. It only occurs in warm, dry locations. It lives on oaks , elderberries , fruit and nut trees, corn and other plants.

Lifestyle and diet

The development of the oblique-banded dwarf ladybug from hatching to adult beetle takes an average of 22.6 days under laboratory conditions at a temperature of 20 ° C, at 35 ° C this period is reduced to an average of 10.6 days. The entire life cycle is shortened at higher temperatures. The generation time is shortest at a temperature of 35 ° C. At these temperatures, several generations per year can occur in Turkey , for example .

The oblique-banded dwarf ladybird can be used in biological plant protection to control the mealy plum aphid ( Hyalopterus pruni ), a species of the tube aphid family that lives as a pest on plum and apricot trees . The elder aphid ( Aphis sambuci ) can also be eaten by the oblique-banded dwarf ladybug , although it is poisonous for all other ladybird species with the exception of the two-point ladybird ( Adalia bipunctata ).

Systematics

The oblique-banded dwarf ladybird belongs to the Scymnini tribe within the ladybird subfamily Coccinellinae. Within the genus Scymnus it is counted to the subgenus Pullus .

supporting documents

Individual evidence

  1. Remzi Atlıhan, Hsin Chi: Temperature-Dependent Development and Demography of Scymnus subvillosus (Coleoptera: Coccinellidae) Reared on Hyalopterus pruni (Homoptera: Aphididae). Journal of Economic Entomology, 101, 2, pp. 325–533, 2008 full text (PDF, English; 843 kB)
  2. Bernhard Klausnitzer: The diagonal bandage dwarf ladybug ( Memento of the original from June 1, 2008 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. , Scymnus subvillosus (GOEZE, 1777) in the logo of the 2005 Entomologentagung in Dresden @1@ 2Template: Webachiv / IABot / www.snsd.de

Web links