Resumo

BERTI, Jesús; MANZO, Damary; RAMOS, Mariela  e  GUERRA, Luis Antonio. Efficacy and residual activity of insect growth regulator pyriproxyfen on larvae of Aedes aegypti (Diptera: Culicidae) under laboratory conditions. Bol Mal Salud Amb [online]. 2013, vol.53, n.1, pp.56-64. ISSN 1690-4648.

Pyriproxyfen  is  a  synthetic  juvenile  hormone analogue and it has been widely used in mosquito control. This re search paper describes experiments or trials carried out under laboratory conditions with a granular formulation of  pyriproxyfen  (Sumilarv  -G  0.5%  in  granules),  using  IV  instars  larvae  of  Aedes  aegypti.  This  is  a  granular formulation of pyriproxyfen with 0.5% of active ingredient. The  efficacy  and residual  activity  of  pyriproxyfen  were evaluated on larvae and pupae of Ae. aegypti using three final  concentrations:  0.002,  0.01  and  0.05  ppm;  at  (initial day = week 0) and at 1, 2, 4, 6 and 8 weeks after treatment (post-treatment).  According  to  the  results,  the  efficacy  of pyriproxyfen was very satisfactory during 8 weeks (60 days) post-treatment,  using  0.05  ppm  of  pyriproxyfen  with  77% (% IE). It was observed that mortality in the pupa stage was higher  than  larvae  mortality  for  all  three  concentrations. However, the percentage of IE in treated water diminished after the initial week (week 0) to 56.7 % (0.002 ppm) and after first week to 98.8 % (0.01ppm). The other aim of the study was to evaluate the efficacy of pyriproxyfen at 0.05 ppm, in relation to the larval density of Aedes aegypti under laboratory conditions. Five larval densities: 25, 50, 75, 100 and 125 larvae, were evaluated at 0.05 ppm. The statistical analysis not revealed significant differences between these densities,  and  did  not  reveal  a  relationship  between  the mosquito larval density and pupae mortality of Ae. aegypti. Whereby,  it  is  concluded  that  by  progressively increasing the  number  of  larvae  treated,  mortality  of  pupae  or  adult emergence inhibition do not decrease, therefore it does not adversely affect the product performance.  

Palavras-chave : Insect  growth  regulators; juvenile  hormone analogues; pyriproxyfen; biochemical  control; Aedes aegypti; larvae; pupae; vectors; dengue.

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