Abstract

CAZORLA, Dalmiro  and  MORALES MORENO, Pedro. Compatibility of 13 Beauveria bassiana isolates pathogenic to Rhodnius prolixus (Triatominae) with insecticides. Bol Mal Salud Amb [online]. 2010, vol.50, n.2, pp.261-270. ISSN 1690-4648.

As part of a global project under current implementation aimed to search optimal fungal pathotypes to be used in integrate pest management (IPM) against Triatomine vectors, the "in vitro" compatibility of 13 native Beauveria bassiana isolates with organophosphorate (malatión, fenitrothion) and pyrethroids (cipermethrine, deltamethrin) insecticides were evaluated. Fungal isolates were assayed to 1x107 conidias/mL and insecticides with two different concentrations. Compatibility of the fungal agents was evaluated based on conidial germination in a solid medium (Sabouraud Dextrose Agar) at 24 h. The results demonstrated that formulations significantly affect (P< 0,0000) the conidial germination, according to fungal isolate, insecticide and doses. Average germination percentages of all fungal isolates were adversely affected in >90%, especially at recommended doses, as compared with control ones. Cipermethrine had a clearly esporocide effect on 13 fungal isolates in both doses, and deltamethrin was the most compatible with them, especially at half the recommended doses.

Keywords : Beauveria bassiana; insecticides; compatibility; entomopatógenic fungi; Integrated Pest Management.