RESUMO
Regarding the high exposure of cockroaches to insecticides in hospitals, the chance for development of resistance is increasing. To determine susceptibility of different strains of Belattella germanica L. to Lambadacygalothrin and Cypermethrin insecticides. The strains were collected from 5 hospital affiliated to Tehran university of medical sciences [Emam, Dr. Shariatii, Markaz e tebi, Ziaeian, Baharlou]. Susceptibility tests were carried out on 1-3 days nymphs according to WHO standard method in different time. Finding: Susceptibility tests on 1-3 days nymphs indicated that the strains of German cockroaches collected from hospital mentioned above were all resistant to Cypermethrin and also with some susceptibility changes to Lambadcyhalothrin. The resistance observed in our study may be due to current use of insecticide for German cockroach control and hence the development of cross resistance to these insecticides
Assuntos
Insetos , Piretrinas , Inseticidas , Hospitais UniversitáriosRESUMO
The genetics and mechanism of malathion resistance in the adults of An. stephensi [BAN-S], Was studied. Nine successive generations of malathion selection in the adults resulted in an increase in LTSO of about 3-fold. The crossing experiments indicated that the resistance is inherited as partially dominant character with no indication of sex linkage. The results of back-crosses suggested that probably more than one genetic factor are responsible for malathion resistance. Synergist study with TPP and PB indicated that the involvement of carboxyesterase as the main resistance factor in An. Srephensi. The cross- resistance spectrum of malathion resistance with pirimiphos- methyl, DDT and dieldrin were studied in the selected strain. The results did not show any relationship between resistances to malathion, DDTand pirimiphos- methyl. Dieldurin test on the selected and uselected strains showed that malathin resistance could increase dieldrin resitance