| survey of resistance to permethrin and diazinon and the use of a multiplex polymerase chain reaction assay to detect resistance alleles in the horn fly, haematobia irritans irritans (l.). | a field survey was conducted in 2001 to evaluate resistance to pyrethroid and organophosphate (op) insecticides on horn flies, hematobia irritans irritans (l.), from seven ranches in the state of tamaulipas, mexico, and from three locations in central texas. filter papers impregnated with either technical permethrin or diazinon were used to measure the levels of resistance to pyrethroids and ops. a multiplex polymerase chain reaction (pcr) assay was used on individual horn flies from these field ... | 2003 | 14765674 |