Neotropical Entomology (2004) 33, 783-791

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Christian Luz, Luiz F.N. Rocha and Gustavo V. Nery (2004)
Detection of entomopathogenic fungi in peridomestic triatomine-infested areas in central Brazil and fungal activity against Triatoma infestans (Klug) (Hemiptera: Reduviidae)
Neotropical Entomology 33 (6), 783-791
Abstract: From 148 substrate samples collected in peridomestic triatomine-infested habitats of 24 farms in Central Brazil, 31 isolates of Metarhizium anisopliae (Metsch.) Sorok. and 15 isolates of Beauveria bassiana (Bals.) Vuill. were obtained. Most of the isolates were found in substrates that consisted of soil mixed with animal feces or soil only in areas of trees where poultry roost and pig houses. Fungi were detected with an insect bait method using Triatoma infestans (Klug), and combined in vitro and in vivo techniques with modified Chase medium and T. infestans. All isolates were highly virulent to T. infestans third instar nymphs at a relative humidity > 98% and temperature of 25 ± 0.5°C. However, activity against nymphs was reduced at 75% relative humidity. Results underline the potential of B. bassiana and M. anisopliae as agents for biological control of vectors of Chagas disease. Both species occur naturally in peridomestic habitats of triatomines in Central Brazil and may contribute to control these vectors and to reduce the risk of reinfestation of houses after eliminating domestic vector species.

Foram detectados 31 isolados de Metarhizium anisopliae (Metsch.) Sorok. e 15 isolados de Beauveria bassiana (Bals.) Vuill. em 148 amostras de substratos coletadas em habitats peridomiciliares infestados com triatomíneos de 24 fazendas localizadas no Centro do Brasil. A maioria dos isolados foi encontrada em solos misturados com fezes de animais ou solos de áreas de poleiros e chiqueiros. Os fungos foram detectados com um método de captura utilizando Triatoma infestans (Klug) como isca, e um método combinado in vitro e in vivo, com meio Chase modificado e T. infestans. Os primeiros estudos sobre a atividade dos fungos indicaram que todos os isolados foram patogênicos para T. infestans quando testados em umidade relativa acima de 98% e 25 ± 0,5°C. Porém, a atividade foi reduzida em umidade relativa de 75%. Os resultados ressaltam o potencial de B. bassiana e M. anisopliae como agentes de controle para os vetores da doença de Chagas. As duas espécies ocorrem naturalmente em habitats peridomiciliares de triatomíneos no Centro do Brasil e podem contribuir para o controle desses vetores e reduzir o risco de reinfestação das casas após eliminação de espécies domiciliares.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Full text of article
Database assignments for author(s): Christian Luz

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
surveys/distribution/isolation


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Triatoma infestans Brazil (south)
Beauveria bassiana (entomopathogen) Triatoma infestans Brazil (south)
Metarhizium anisopliae (entomopathogen) Triatoma infestans Brazil (south)