Ecevit, O., Işık, M., & Yanilmaz, A.F. 1987 Bio-ecological researches on Parthenolecanium corni Bouche, Parthenolecanium rufulum Ckll. and Lepidosaphes ulmi L. which are harmfull of hazelnut and chemical control studies on Lepidosaphes ulmi L.. Ondokuzmayis Universitesi Yayinlari 19: 1-34.

Notes: Life histories; natural enemies; parasitism rates.