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Articles by M. Limoee
Total Records ( 2 ) for M. Limoee
  M. Limoee , H. Ladonni , A.A. Enayati , H. Vatandoost and M. Aboulhasani
  The insecticide resistance status in seven field collected strains of the German cockroach, Blattella germanica (L.) against three pyrethroids: permethrin, cypermethrin and cyfluthrin and cross resistance between these pyrethroids and organochlorine DDT were detected by glass jar test method. For detection of pyrethroid resistance in adult males of field collected strains, the glass jar knockdown test was used and the susceptibility level of each field strain was compared with that of a standard susceptible strain based on Resistance Ratio (RR) calculated by dividing the KT 50 of field strain by the KT 50 of standard susceptible strain. Tests were replicated three to six times in groups of ten cockroaches. For detection of DDT resistance in adult males of the field collected strains, the glass jar mortality test was used to compare the susceptibility level of each field strain with that of susceptible strain based on the mortality rate obtained from exposing them to a single discriminating dose. Tests were replicated three or four times in groups of ten cockroaches. The results of this study indicated that all the field-collected strains of German cockroach were resistant to three pyrethroids: permethrin, cypermethrin and cyfluthrin, i.e., the Resistance Ratios (RRs) of different strains ranged from 5.26 to 23.7 fold for permethrin, 2.9 to 20.7 fold for cypermethrin and 2.4 to 11.42 fold for cyfluthrin, respectively. The order of resistance level to three pyrethroid insecticides was permethrin>cypermethrin>cyfluthrin. Among these seven fields collected strains, five showed high resistance to organochlorine DDT indicating the possible cross resistance between three pyrethroid insecticides used in this study and the organochlorine DDT. Present results demonstrated the differential responses among field collected strains of German cockroach to pyrethroid and DDT insecticides. The information achieved on cross resistance between these three pyrethroid insecticides used in this study and organochlorine DDT could provide the preliminary information for a mechanistic study on possible mechanisms of insecticide resistance in pyrethroid resistant strains.
  H. Nasirian , H. Ladonni , M. Aboulhassani and M. Limoee
  The German cockroach is an important household insect pest worldwide and acts as a mechanical vector and reservoir for pathogenic agents. The aim of this study was to examine the basic laboratory toxicity of Blattella germanica to spinosad. The M, T, A22, AZAR4, BOOSTAN7 and ABAN21 strains were collected from field populations of six infested kitchen student dormitories and the SAMAN strain was collected from a residential area after insecticide spraying control failure in Tehran, Iran. Technical grade spinosad was delivered in 0.5 μL acetone to the first abdominal sternum of briefly CO2-anesthetize adult male cockroaches by topical application bioassay. Treated males monitored for mortality. Mortality data from the replicates was assessed by probit analysis. The average LD50 of susceptible strain was 494.3, 148.8 and 55.1 ng per insect after 24, 48 and 72 h, respectively. The LD50 of spinosad decreased with time in the field population strains. All German cockroach strains showed a similar susceptibility or lower tolerance (1.6-folds) for spinosad compared with the susceptible laboratory strain and the steep slopes of dose-response curves indicated that the field population of these German cockroach strains was homogenous in response to spinosad. These results indicated that the spinosad was relatively slow-acting in topical application bioassay, with LD50 values decreasing until 72 h and becoming stable thereafter. The effectiveness of spinosad against susceptible and the field population German cockroach strains in laboratory condition showed that spinosad probably could be useful for the control of the German cockroach.
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