Bioactivity and field efficacy of frequently used insecticides against two wood-born pests of Fraxinus pennsylvanica
[Aims]The aim of this study is to screen efficient insecticides with low toxicity and low residue to effectively control the main stem borer Streltzovela insularis and Agrilus planipennis in green ash(Fraxinus pennsylvanica).[Methods]We selected the insect soaking method and leaf soaking method to determine the laboratory biological activity of S.insularis larvae and A.planipennis adults respectively,and conducted field efficacy trials against S.insularis using trunk injection method.[Results]Abamectin had the highest biological activity to the 10th instar larvae of S.insularis,with a medium lethal concentration(LC50)of 16.06 mg/L at 24 h,while chlorantraniliprole had the lowest toxicity to the larvae of S.insularis.For the adults of A.planipennis,abamectin had the highest biological activity with a(24 h)LC50 of 36.53 mg/L,while acetamiprid had the lowest activity.Acetamiprid 10％ME at 800 and 1600 mg/L,emamectin benzoate 2％ME at 40 and 160 mg/L,broflanilide 100 g/L SC at 2000 and 4000 mg/L,and abamectin 1.8％EC at 28.8 and 57.6 mg/L had excellent control effect on the larvae of S.insularis in fields,with control efficiency all above 95％.[Conclusions]Acetamiprid,emamectin benzoate or abamectin can be used to control the larvae of S.insularis,while abamectin and emamectin benzoate have good activity in laboratory against the adults ofA.planipennis.
Fraxinus pennsylvanicainsecticidebioactivity determinationfield control efficacyStreltzoviella insularisAgrilus planipennis
万方数据
维普
