Survey of natural populations of <i>Trichogramma</i> (Hym., Trichogrammatidae) in the vineyards of Alsace (France)

Abstract

Activity of Trichogramma , assessed by trapping with host‐eggs, was observed as early as April and continued until October in the vineyards and their surrounding biotops. Trichogramma showed the greatest activity in April‐May, July and September. Parasitized eggs were found before the main laying period of the first generation of the grapevine moths Lobesia botrana Den. and Schiff. and Eupoecilia ambiguella Hb. Four native species, Trichogramma cacoeciae Marchal, Trichogramma daumalae Dugast and Voegelé, Trichogramma evanescens Westwood and Trichogramma principium Sugonjaev and Sorokina were found.