Biological control of the damson-hop aphid, Phorodon humuli (Hom.: Aphididae) , using the ladybeetle Harmonia axyridis (Col.: Coccinellidae)

摘要: The possibility of usingHarmonia axyridis (Pallas) to control the damson-hop aphidPhorodon humuli (Schrank) in a dwarf-hop garden was studied northern France 1994 and 1995. Second third instar larvae ofH. were released at different stages aphid population increase (early, time insecticide treatment threshold exceeded late). In control, number aphids reached 191.3±30.8 per leaf end June. plots where 50 plant released, best obtained when early approximately 20 leaf. this case, average did not exceed 54.5±10.3 June, which is lower than 80 Indigenous predators, especiallyAdalia bipunctata L., complemented effect axyridis.