Rawat, U.S., Thakur, J.N., & Pawar, A.D. 1988 Introduction and establishment of Chilocorus bijugus Mulsant and Pharaoscymnus flexibilis Mulsant, predatory beetles of San Jose scale at Thanedhar areas in Himachal Pradesh.. Current Science 57(22): 1250-1251.

Notes: Abstract: Quadraspidiotus perniciosus (Hemiptera: Diaspididae) is notorious pest; grows throughout the deciduous fruit-growing regions of the world; attacks apple, plum, pear and peach in Jammu & Kashmir, Himachal Pradesh and Utter Pradesh; chemical control difficult due to high cost, waxy covering and development of insecticidal resistance; natural enemies include Chilocorus bijugus, Pharoscymnus flexibilis, Encarsia perniciosi and Aphytis proclia; comparison and success of attempts at biological control discussed. Keywords: biological control.