الفهرس | Only 14 pages are availabe for public view |
Abstract Toxicological studies were carried out for evaluating the efficacy of some insecticides from different groups incorporated in sand soil with serial concentrations of each against the laboratory strain of the Mediterranean fruit fly, Ceratitis capitata (Wied) .The results cleared that the biological insecticide, effective microorganisms (EMS) recorded the highest toxicity; whereas the entomopathogenic bacteria, bio-tect was the least toxicity one against the tested pest. Based on the persistence of the tested insecticides, the practical concentrations of these toxicants included malathion H, entomopathogenic fungi, bio-power and bio-magic. Entomopathogenic bacteria, bio-tect and the effective microorganisms (EMS) were 4000, 40000, 40000, 40000 and 4000 ppm ; respectively . Monitoring resistance levels in field strains of Ceratitis capitate flies collected from different Governorates , i .e. Sharkia, Gharbia, Behera and Kafrel-sheikh showed by using discriminating concentrations (LC99 values) of malathion H used previously against the baseline laboratory strain caused mortality rates of 34.50, 45.50, 50 and 44.5 % in the these field strains. The corresponding resistance percentages were 65.15, 54.04, 49.49 and 55.05% ; respectively . The results of the present investigation revealed that the acetyl cholinesterase, β-non-specific esterases, alkaline phosphatase and mixed function oxidases activity in the different tested field strains were higher that the corresponding levels of the baseline laboratory strain. The highest levels of these enzymes activity were occurred in sharkia strain, whereas the least levels of the enzymes activity were presented in behera strain. |