The development of the bean seed fly <Emphasis Type="Italic">Delia platura</Emphasis> Mg. (Diptera,Anthomyiidae) and its harmfulness in forest-steppe agrocenoses of Samara Province

Delia platura Mg. is a polyphagous and polyvoltinic Holarctic species feeding mainly on booting cereals and seedling roots. In Samara Province, three generations of the species develop annually; the species hibernates as puparia in soil under winter crops at a depth of 10–20 cm; adults emerge during the first ten days of May. Most of all, the fly infests barley and winter wheat, preferring crop rotation systems with green-manure fallow and causing 2.6–7.2% yield loss.