Orlinskii, A.D. 1989a [Development of the bio-method in Bulgaria.]. Zashchita rastenii. Moscow No. 12: 54.

Notes: Short accounts are given of the use or encouragement of various biological agents to control Colorado potato beetle [Leptinotarsa decemlineata], fall webworm [Hyphantria cunea] and California scale [Quadraspidiotus perniciosus] in Bulgaria, and information is also given on practical and investigative work on the control of various other insect and mite pests of field and greenhouse crops, vines and forest plantations by the encouragement or release of natural enemies.