Occurrence, development and natural enemies of Pemphigus spyrothecae (Homoptera, Pemphigidae)
In 2001, galls were analysed of Pemphigus spyrothecae Pass.taken in one- to three-week intervals from Populus nigra and P.nigra var.italica at 4 localities in Brno.Fundatrices matured in the first half of June and during the first half of summer produced about 50 offsprings.Virgines produced about 10 offsprings which grew up in winged sexuparae.The