Biological studies on Eulecanium coryli L., the pest of fruit trees in Esfahan.
Eulecanium tiliae (L.) (coryli (L.)), a polyphagous scale insect attacking various fruit trees in Iran, was especially abundant in the Isfahan district, where it was recorded on 11 species of trees including quince, cherry, sour cherry, apple, plum, almond, apricot and hawthorn. Biological studies in this area showed that it had 1 generation a year, the nymphs overwintered and the adult females emerged in April and oviposited mostly in early May. The nymphs hatched after 20-25 days at the beginning of June and fed on the leaves until the autumn, when they migrated to the young twigs. E. tiliae was heavily parasitised by 3 unidentified species of Hymenoptera.