De la Cruz Abarca, C., & Chumpitaz Avila, J.C. 1996 [Planococcus citri, pest of apple in Mala Valley.] Planococcus citri, plaga del manzano en el valle de Mala.. Revista Peruana de Entomología 39: 99-104.

Notes: This citrus mealybug causes significant damage to apples; study of behavior of mealybug at different stages of apple tree development; causes staining of apples and requires farmers to wash fruit, thereby raising production costs; importance of biological control.