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Cockchafer larvae; the most common species in Central Europe is the field cockchafer (Melolontha melolontha). This last occurred in large quantities in the 1950s. From the end of the 1990s there was again a massive appearance in Switzerland, South Tyrol and in the German Kraichgau (Baden wine region), which required control measures. The field cockchafer generally goes through a three-year development and flies every fourth year. In the first year, after mating, from late April to early June, the eggs are laid at a depth of 10 to 25 centimeters. After about six weeks, the larvae (grubs) pass through three stages and feed on the roots until autumn vines,

Grub - cockchafer and grub (caterpillar)

After the respective winter dormancy, the larvae feed on root feed in the second and third year. Sexually mature in September of the third year Beetle who hibernate and then fly in the fourth year. The beetles themselves eat on various deciduous trees, but the vine is not a preferred food. The grubs can mainly in nurseries and young plants cause considerable root damage. The control is carried out in the flight year by covering the ground with close-meshed nets to prevent emigration, as well as with biological agents (fungal pathogens) or insecticides, See also under Vine enemies,

Cockchafer : Dirk (Beeki®) Schumacher from Pixabay
Engerling: Beat Fecker WSL

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