The activity of some acylurea insect growth regulators against forest pest sawflies (Pamphilidae and Diprionidae).
The bioactivity of 5 acylurea insect growth regulators (diflubenzuron, teflubenzuron, triflumuron, flufenoxuron and GR 572 (novaluron)) used in commercial or experimental formulations against forest defoliating insects from the order of Hymenoptera (such as Diprionidae and Pamphiliidae) was evaluated in laboratory and field experiments during the period 1986-91. Laboratory tests were performed with larvae of Gilpinia frutetorum and Diprion simile collected from Scots pine [Pinus sylvestris] stands in Białków forest district, Poland. Field trials were undertaken in Scots pine or Norway spruce [Picea abies] stands infested by sawflies in various districts of Poland. The insect pests involved were Diprion pini, Neodiprion sertifer and Acantholyda nemoralis [A. posticalis] (in pine stands), and Cephalcia abietis and Cephalcia falleni (in spruce stands). All compounds tested showed a high potential for control of these pests. The activity was mainly dependent upon the period of time after treatment. The control was most effective when treatments were performed on the egg stage of the insects.