Blumberg, D., Wysoki, M., & Hadar, D. 1993 [Further studies of the encapsulation of eggs of Metaphycus spp. Hym. Encyrtidae by the Pyriform scale Protopulvinaria pyriformis Hom. Coccidae.] Israel.. Entomophaga 38(1): 7-13.

Notes: Abstract: Seasonal variations occurred in the encapsulation of eggs; high rates of encapsulation during the summer may interfere with efficient biological control. Keywords: biological control.