| status of insecticide resistance in culex pipiens field populations from north-eastern areas of italy before the withdrawal of op compounds. | heavy and constant use of organophosphorus (op) larvicides selected culex pipiens l. resistant populations through two main mechanisms of genetic resistance, the increased activity of detoxifying esterase and the production of alterate acetylcholinesterase-1 (ache1) by g119s mutation. the aim of this study was the assessment of the distribution of cx. pipiens populations resistant to temephos and chlorpyrifos in the north-eastern regions of italy and the occurrence of the insensitive ache in the ... | 2010 | 21162149 |
| [resistance to the organophosphate insecticides temephos and malathion in culex pipiens l. (diptera, culicidae) from the adriatic coast near friuli]. | susceptibility to organophosphorus insecticides temephos and malathion was tested in culex pipiens l. larvae from friuli adriatic coast (north-east of italy). the samples were collected in various sites of three zones with different intensity of insecticidal treatments. tests were made following the w.h.o. recommendations. the tests were made on larval samples which were exposed for 24 hours to ascending concentrations of each insecticide. from the observed percentage mortalities the lc50 and lc ... | 1993 | 7520564 |
| esterases a5-b5 in organophosphate-resistant culex pipiens from italy. | culex pipiens mosquitos from lignano city, udine province, northeast italy, were found to carry over-produced non-specific esterases a1, a2-b2 and a4-b4 or a5-b5, detected by starch gel electrophoresis, giving multiple resistance to organophosphorus insecticides. in order to differentiate between a4-b4 and a5-b5 esterases, the latter known only from cyprus whereas the former is widespread in italy and elsewhere, restriction fragment length polymorphism (rflp) analysis was performed at the estera ... | 1997 | 9226639 |
| usutu virus in italy: an emergence or a silent infection? | a two year study (2008-2009) was carried out to monitor the usutu virus (usuv) circulation in italy. sentinel horses and chickens, wild birds and mosquitoes were sampled and tested for the presence of usuv and usuv antibodies within the wnd national surveillance plan. seroconversion evidenced in sentinel animals proved that in these two years the virus has circulated in tuscany, emilia romagna, veneto and friuli venezia giulia regions. in veneto usuv caused a severe blackbird die-off disease inv ... | 2011 | 21550731 |