Virulência de fungos entomopatogênicos sobre larvas de Lepidoptera: Noctuidae

Elisângela de Souza Loureiro; Pamella  Mingotti Dias; Luis Gustavo Amorim Pessoa; Tatiana Souza do  Amaral; Marcelo Bruno Pessoa; Gabriella Silva de Gregori; Andressa Silva Rodrigues; Maurício Sekiguchi de Godoy

doi:10.1590/1983-21252024v3712375rc

Autores

Elisângela de Souza Loureiro https://orcid.org/0000-0002-9708-3775
Pamella Mingotti Dias https://orcid.org/0000-0002-0963-9455 (não autenticado)
Luis Gustavo Amorim Pessoa https://orcid.org/0000-0003-4646-062X
Tatiana Souza do Amaral https://orcid.org/0000-0001-5674-4998
Marcelo Bruno Pessoa https://orcid.org/0000-0002-2601-8511
Gabriella Silva de Gregori https://orcid.org/0009-0003-8577-0986
Andressa Silva Rodrigues https://orcid.org/0000-0001-5602-1474
Maurício Sekiguchi de Godoy https://orcid.org/0000-0002-3842-340X

DOI:

https://doi.org/10.1590/1983-21252024v3712375rc

Palavras-chave:

Controle biológico. Beauveria. Metarhizium. Helicoverpa. Manejo de pragas.

Resumo

Atualmente, os sistemas de cultivo agrícola adotam o manejo integrado de pragas (MIP) como modelo de sucesso para o controle de pragas. O uso de fungos entomopatogênicos tem aumentado no manejo integrado devido ao seu grande potencial em reduzir as populações de pragas agrícolas sem causar danos à saúde humana e aos ecossistemas. Beauveria bassiana e Metarhizium anisopliae são as espécies de fungos mais utilizadas no controle biológico, contando com muitos isolados comercializados no mundo. Helicoverpa armigera é uma praga de importância agrícola, causadora de prejuízos associados a diversas culturas. Assim, esse estudo teve como objetivo avaliar o potencial virulento de Beauveria bassiana, Metarhizium anisopliae e Metarhizium rileyi no controle biológico dos estágios larvais de H. armigera. Os resultados indicaram que em diferentes concentrações (1 × 10⁷, 1 × 10⁸ e 1 × 10⁹ con.mL^-1) e métodos de aplicação (DA ou DF) B. bassiana (cepa ESALQ PL63), M. anisopliae (cepa ESALQ E9) e M. rileyi (cepa UFMS 03) causaram baixa mortalidade e não foram virulentos ao primeiro, terceiro e quinto ínstares de H. armigera. A mortalidade pelo tratamento com B. bassiana (cepa ESALQ PL63) foi confirmada por conidiogênese em todos os cadáveres. Dada a importância de H. armigera como praga agrícola e a biodiversidade de fungos entomopatogênicos no Brasil, novas investigações sobre a virulência de cepas fúngicas são necessárias para aprimorar o manejo integrado de pragas através do controle microbiano, o potencial para novas cepas e o entendimento das relações entre microrganismos e os mecanismos de defesa dos hospedeiros.

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Biografia do Autor

Elisângela de Souza Loureiro

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