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Demographic effects of deltamethrin resistance in the C hagas disease vector T riatoma infestans
Author(s) -
GERMANO M. D.,
PICOLLO M. I.
Publication year - 2016
Publication title -
medical and veterinary entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.028
H-Index - 82
eISSN - 1365-2915
pISSN - 0269-283X
DOI - 10.1111/mve.12196
Subject(s) - deltamethrin , biology , triatoma infestans , fecundity , nymph , longevity , vector (molecular biology) , population , toxicology , instar , larva , zoology , genetics , ecology , parasite hosting , pesticide , demography , trypanosoma cruzi , sociology , world wide web , computer science , gene , recombinant dna
Triatoma infestans ( H eteroptera: R eduviidae) K lug is the main vector of C hagas disease in L atin A merica. Resistance to deltamethrin was reported in A rgentina and recently associated with reproductive and longevity trade‐offs. The objectives of the present study were to describe the demographic consequences of deltamethrin resistance in T . infestans and to establish possible target stages for chemical control in susceptible and resistant colonies. A stage‐classified matrix model was constructed based on the average stage length for susceptible, resistant and reciprocal matings' progeny. The differences between colonies were analysed by prospective and retrospective analysis. The life table parameters indicated reduced fecundity, fertility and population growth in resistant insects. The retrospective analysis suggested the latter was associated with lower reproductive output and increased fifth‐instar nymph stage length. The prospective analysis suggested that the adult stage should be the main target for insecticide control. Although, fifth‐instar nymphs should also be targeted when resistance has been detected. The presented results show demographic effects of deltamethrin resistance in T . infestans . While the older stages could be the main targets for chemical control, this approach is impeded by their higher tolerance to insecticides. It is concluded that the different mode of action insecticides would be more effective than a dose increase for the control of deltamethrin‐resistant T . infestans .