Susceptibility of Tetranychus ogmophallos (Acari: Tetranychidae) to Beauveria bassiana and Metarhizium anisopliae

Authors

  • Tamires dos Santos Barbosa Laboratory of Acarology, Department of Plant Protection, Faculty of Agronomy and Veterinary Sciences, São Paulo State University “Júlio de Mesquita Filho” (UNESP), 14884-900, Jaboticabal, São Paulo, Brazil
  • Daniel Junior Andrade Laboratory of Acarology, Department of Plant Protection, Faculty of Agronomy and Veterinary Sciences, São Paulo State University “Júlio de Mesquita Filho” (UNESP), 14884-900, Jaboticabal, São Paulo, Brazil;
  • Ricardo Antonio Polanczyk Laboratory of Microbial Control of Pests, Department of Plant Protection, Faculty of Agronomy and Veterinary Sciences, São Paulo State University “Júlio de Mesquita Filho” (UNESP): 14884-900 – Jaboticabal – SP, Brazil
  • Rogério Teixeira Duarte Laboratory of Entomology, University of Araraquara (UNIARA): 14801-340 – Araraquara – SP, Brazil

Keywords:

peanut red mite, Arachis hypogaea, Arachis pintoi, microbial control, forage peanut

Abstract

Tetranychus ogmophallos Ferreira & Flechtmann (Acari: Tetranychidae) is an emergent pest in peanut (Arachis hypogaea L. [Fabaceae]) and an important pest of forage peanut (A. pintoi Krapov. & W.C. Greg. [Fabaceae]). The susceptibility of T. ogmophallos to Beauveria bassiana (Balsamo) Vuillemin (Cordycipitaceae) and Metarhizium anisopliae (Metschnikof) Sorokin (Clavicipitaceae) was evaluated under laboratory and greenhouse conditions. In the laboratory, adult T. ogmophallos females were treated with B. bassiana and M. anisopliae using a Potter’s tower, and in the greenhouse, bio-insecticides were applied on infested peanut plants. Both fungal suspensions containing 108 conidia per mL caused greater mortality in adult T. ogmophallos females. At 7 d after treatment under laboratory conditions, B. bassiana resulted in 100% mortality and M. anisopliae almost 100% mortality. Bio-insecticides substantially reduced the mite population density under greenhouse conditions when applied to infested peanut plants, with mite populations reduced 84% and 92% by B. bassiana and M. anisopliae, respectively. Under greenhouse conditions, the increase in the number of mites per plant observed at 15 d after treatment suggests the need to repeat the entomopathogen application. Our results demonstrate that B. bassiana and M. anisopliae are promising biological agents to control T. ogmophallos. The practical application of this work for managing T. ogmophallos population on peanut crop is discussed.

 

Resumo

Tetranychus ogmophallos Ferreira & Flechtmann (Acari: Tetranychidae) é uma praga emergente na cultura do amendoim (Arachis hypogaea L. [Fabaceae]) e uma importante praga de amendoim forrageiro (A. Pintoi Krapov. & W.C. Greg. [Fabaceae]). A suscetibilidade de T. ogmophallos aos bioinseticidas Beauveria bassiana (Balsamo) Vuillemin (Cordycipitaceae) e Metarhizium anisopliae (Metschnikof) Sorokin (Clavicipitaceae) foi avaliada em laboratório e em casa de vegetação. No laboratório, fêmeas adultas de T. ogmophallos foram tratadas com B. bassiana e M. anisopliae sob torre de Potter e em casa de vegetação, os bioinseticidas foram aplicados sobre plantas de amendoim infestadas e avaliações foram realizadas durante 15 dias. Suspensões de ambos os fungos contendo concentração de 109 conídios para mL causaram alta mortalidade de ácaros. No experiment em laboratório 7 d após as aplicações, B. bassiana causou 100% de mortalidade e M. anisopliae causou mortalidade próximo de 100%. Os fungos reduziram substancialmente a densidade populacional do ácaro quando aplicados sobre plantas infestadas, com reduções que atingiram cerca de 84% para B. bassiana e 92% para M. anisopliae. Em condições de casa-de-vegetação, o aumento no número de ácaros por planta observado aos 15 d após as aplicações reflete a necessidade de realizar uma nova aplicação dos entomopatógenos. Concluiu-se que B. bassiana e M. anisopliae são promissores agentes no controle biológico do ácaro T. ogmophallos. A aplicação prática deste trabalho para o manejo de T. ogmophallos na cultura do amendoim será discutida.

 

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Author Biographies

Tamires dos Santos Barbosa, Laboratory of Acarology, Department of Plant Protection, Faculty of Agronomy and Veterinary Sciences, São Paulo State University “Júlio de Mesquita Filho” (UNESP), 14884-900, Jaboticabal, São Paulo, Brazil

Laboratory of Acarology, Department of Plant Protection.

Daniel Junior Andrade, Laboratory of Acarology, Department of Plant Protection, Faculty of Agronomy and Veterinary Sciences, São Paulo State University “Júlio de Mesquita Filho” (UNESP), 14884-900, Jaboticabal, São Paulo, Brazil;

Laboratory of Acarology, Department of Plant Protection.

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Published

2019-04-27

Issue

Vol. 101, No. 2 (June 2018)

Section

Research Papers

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