أرسل هذا في رسالة قصيرة: Establishment of the biological control system by black ant, Dolichoderus thoracicus (Smith) (Hymenoptera: Formicidae) and mealybug, Cataenococcus hispidus (Morrison) (Homoptera: Pseudococcidae) against the cocoa pod borer, Conopomorpha cramerella (Snellen) (Lepidoptera: Gracillariidae) in North Sumatera, Indonesia.