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Larvae of the cockchafer; The most widespread species in Central Europe is the field corn beetle (Melolontha melolontha). This occurred in the 1950s for the last time in large quantities. From the end of the 1990s, Switzerland, South Tyrol and the German Kraichgau (Baden winegrowing area) once again had a massive presence requiring control measures. The field cockchafer generally undergoes a three-year development and flies every four years. In the first year after the mating from the end of April to the beginning of June, the eggs are laid at a depth of 10 to 25 centimeters. After about six weeks, the three stages hatch through running larvae (grubs) and eat at the roots of the roots until autumn vines,

Engerling - Cockchafer and Engerling (caterpillar)

After each hibernation, the larvae live in the second and third year of Wurzelelfraß. In September of the third year, the sexually mature hatch Beetle who hibernate and then fly for the fourth year. The beetles themselves feed on various deciduous trees, but the vine is not a preferred food. The grubs can be especially in nurseries and young plants cause considerable root damage. Fighting takes place in the year of flight by covering the soil with tight meshes to prevent emigration, as well as with biological agents (fungal pathogens) or insecticides, See also below Vine enemies,

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

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