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Articles by H. Ladonni
Total Records ( 4 ) for H. Ladonni
  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.
  S. Azari-Hamidian , M.R. Abai , K. Arzamani , H. Bakhshi , H. Karami , H. Ladonni and R.E. Harbach
  In order to study mosquitoes in North Khorasan Province, northeastern Iran and assess the zoogeographic affinities of the Iranian and Middle Asian fauna, mosquito surveys were conducted in the province during 2005-2009. Adult mosquitoes were collected from resting sites and while landing on human and dog bait by means of aspirator. Larvae were collected by means of pipette and dipper using the standard dipping technique. In total, 1,336 mosquito specimens, including 682 adults and 654 third- and fourth-instar larvae, were collected. Fourteen species representing five genera were identified: Anopheles claviger, An. maculipennis, An. superpictus, An. pulcherrimus, Culex hortensis, Cx. mimeticus*, Cx. modestus*, Cx. perexiguus*, Cx. pipiens*, Cx. theileri, Cx. tritaeniorhynchus, Culiseta longiareolata, Ochlerotatus caspius* and Uranotaenia unguiculata (asterisks indicate new occurrence records for the province) based on morphology and An. maculipennis based on the internal transcribed spacer 2 ribosomal DNA (ITS2 rDNA) sequence. The data show that 65% of the anopheline fauna of Middle Asia occurs in Iran, however at least 15 Anopheles taxa found in Iran are not recorded in Middle Asia. Only seven (28%) of the aedine mosquitoes recorded in Middle Asia are found in Iran and three species that occur in Iran are not found in Middle Asia. About 77% of the Middle Asian species of Culex occur in Iran whereas the Iranian fauna includes nine species that are not recorded in Middle Asia. The species of Coquillettidia, Culiseta and Uranotaenia that are found in Iran are also found in Middle Asia.
  H. Nasirian , H. Ladonni , M. Shayeghi and M. Soleimani Ahmadi
  The present study investigated the probable responsible reasons for non-response the B. germanica to permethrin only in World Health Organization glass jar method after insecticide spraying control failure with pyrethroid insecticide groups in Islamic Republic of Iran. Eleven German cockroach strains were collected from field populations of nine infested kitchen student dormitories and two infested hospitals after insecticide spraying control failure with pyrethroid insecticide groups in Iran. The current study, in World Health Organization glass jar and knock down methods conducted on newly emerged adult males.All feral strains, with various levels of resistance to pyrethroids, in World Health Organization glass jar method at 400 min (6 h) time exposures, was not observed mortality, while the susceptible strain was observed 100% mortality in 25 min time exposures. Susceptible strain at LT50 after assessing on mortality data from the replicates by probit analysis in World Health Organization glass jar method was 15.3 min. In this study, all feral strains in World Health Organization glass jar method after 400 min (6 h) time exposures, was not observed mortality, that showed these strains very high-level resistance to permethrin. In the knock down method, the resistance ratios were 3.6 to 26.1-folds compare with the susceptible reference strain. In a comparison, among this study and previous studies resistance ratios of 8.6 to 17.7-folds for permethrin in topical application, indicated that German cockroach have had under pressure spraying. German cockroach have had in vicinity to pyrethroid insecticides especially permethrin in these locations in long period for non-responding to permethrin insecticide only in World Health Organization glass jar method, and the field evident confirm this subject.
  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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