Hadar, D., Wysoki, M., & Rosen, D. 1995 Phenology of the pyriform scale, Protopulvinaria pyriformis Cockerell (Coccidae), and distribution of its natural enemies in Israel.. Israel Journal of Entomology 29: 268.

Notes: This scale has been an important pest of avocado in Israel since 1980; attempt is being made to find a solution that would not interfere with the biological control programs already established in avocado plantations; trials are under way with importations from South Africa, Kenya, Florida, California and Spain of Metaphycus swirskii, M. stanleyi, Metaphycus helvolus, Pachyneuron concolor, Marietta javensis and Metaphycus sp.