The larch tortrix (Zeiraphera griseana) is a small moth of the family of Totricidae, with 16-22 mm wingspan, distributed throughout Europe (except Portugal and most of the Balkan peninsula), Russia and Japan, was recorded also in Korea
The front wing has a white background color, variously suffused with light gray and sparsely streaked with often indistinct shades of pale ocher;
there are markings that go from gray to gray-white with the addition of ocher and black. Oblique median band, narrow, confluent with the pre-Tornale marking.
white cilia, gray soffused, with a sub-basal line. Rear wing gray, with apical darker, light gray cilia. Absent sexual dimorphism.
Markings may vary depending on the ecotype, such as nell'ecotipo "Swiss stone pine" in which the front wing markings, vary in depth and clarity, and
become stronger and better defined.
The egg has oval and flat forma , along with 0.6-0.7 mm 0.4-0.5 mm wide, yellowish, finely carved and textured.
The larva stadiums 1 to 4 has the yellowish gray body; encapsulated head, neck and anal shield, blacks . The 5th larval stage is darker in color.
In the Alps, are two varieties of color they were distinguished; the "Swiss stone pine type" is brown with two yellowish stripes lateral dorsal, thoracic legs with dark brown, while the "Larch Type"
is dark gray, with the head, capsules and blacks scleritis, as in younger stages.
The pupa has a length of 7.5-12.5 mm, reddish brown.
At altitudes below 1000 m above sea level, the adult moth occurs in the second half of June and in July, and from mid-July to October in the higher elevations.
Butterflies fly at dusk and dawn, as well as during the day, a minimum temperature of 8 ° C. The main flight activity starts at sunset, the male moths fly
briskly around the treetops. This activity can last until midnight until the temperature is above 8 ° C.
Are possible flights of dispersion even at considerable distances.
The Zeiraphera griseana is a defoliating pest of various conifers, including Larix, Pinus and Picea. Multiplications of Zeiraphera griseana mass
occur periodically (with cycles of 8-10 years duration) on the European larch and stone pine or stone pine in the Alps, as well as the Siberian larch,
of Sukachev larch and Dahurian larch in Siberia.This moth does not destroy the forest of larch, but changes the structure and growth.
The period of damage is from April-May to early July .