Black plant louse of the cherry tree

The black Plant louse of the cherry tree ( Mysus cerasi )

The Cerisier is very sensitive to a black plant louse. This plant louse, by feeding from the sap, secret simultaneously a toxin generating a rolling up of the sheets.

They appear in spring at the ends of the growths. The females emigrate in summer, turn over on the cherry tree in September and multiply there by parthenogenesis. In September appear winged males which fertilize the females which lay at the base of the final buds.

Very difficult to destroy, it is imperative to treat before the appearance of these plant louses.

Description

the adults make 2 mm length, are globulous, black very dark brilliance with reflections brown.

Biology

the hivernation is done with the egg state laid on the trunk, the branches or with the birth of the buds. The founders appear in March - April.
Several generations follow one another at the end of the growths of the Cherry tree or the lower face of the sheets, gathering the foliage out of compact packages in the medium of which many Fourmis circulates.

Life cycle

the winged ones appear in June - July and emigrate on the secondary hosts on whom they multiply.
the flight of return on the Cherry tree and the laying of egg of winter intervene as from October.

Damage

the damage of this Plant louse is frequent. They coincide with the maturation of cherries and can be very important at the young subjects.
the sheets are recroquevillent while being rolled up, are corrugated and gathered out of packages often very dense. The whole tree takes an aspect rabougri. The honeydew causes burns and the drying of the sheets.

Treatment

in winter: with mineral oils to destroy the eggs
in spring: with the nicotinée pulp.

Random links: