Unusual occurrence of cocoons in population of the saddle gall midge, Haplodiplosis marginata (Diptera: Cecidomyiidae), in Belgium ; Occurrence inhabituelle de cocons dans les populations de cécidomyie équestre, Haplodiplosis marginata (Diptera : Cecidomyiidae), en Belgique

peer reviewed ; The saddle gall midge, Haplodiplosis marginata (von Roser) (Diptera: Cecidomyiidae), is a phytophagous species that develops in saddle-shaped galls on stems of wheat Triticum vulgare, barley Hordeum sativum, rye Secale cereale and some other species of Poaceae. Only one generation develops per year. Full-grown larvae leave galls, drop onto the soil where they remain up to the springtime of the following year. Larvae do not usually spin cocoons. However, formation of cocoons by larvae was observed in populations developing in western Europe: in England in 1954, in the Netherland... Mehr ...