Virulence of Metarhizium rileyi (Ascomycota: Clavicipitaceae) to Spodoptera cosmioides (Lepidoptera: Noctuidae)

• Main Author: Loureiro, Elisângela de Souza
• Publication Date: 2020
• Other Authors: Lima, Antonio Robis de, Pessoa, Luis Gustavo Amorim, Dias, Pamella Mingotti, Adão, Daimara Viviane, Assis, Leonardo Ferreira
• Format: Article
• Language: por
• Source: Research, Society and Development
• Download full: https://rsdjournal.org/index.php/rsd/article/view/3962
• topic: Control microbiano; entomopatógenos; Glycine max; oruga de vaina; oruga de hoja de soja.; Controle microbiano; entomopatógeno; Glycine max; lagarta das vagens; lagarta desfolhadora da soja.; Microbial control; entomopathogen; Glycine max; pod caterpillar; soybean caterpillar.

This work aimed to evaluate the pathogenicity of the UFMS 03 strain of Metarhizium rileyi to the Spodoptera cosmioides caterpillars under laboratory conditions. The experimental trial consisted of a completely randomized design, with six treatments. Each treatment consisted of 10 repetitions, containing five S. cosmioides caterpillars, standardized in 3 mm in length. The S. cosmioides caterpillars were placed inside Petri dishes and sprayed with the aid of an adapted Poter Tower, at a pressure of 15 pounds / inch, using 1 mL of the concentrations 1.0×1010, 1.0×109, 1.0×108, 1.0×107 and 1.0×106 conidia mL-1. Afterwards, the plates were sealed with pvc film and placed in an air-conditioned chamber at 25±1 °C, 70±10% RH, and a 12-hour photophase. Mortality was verified 24 hours after spraying. The concentrations of the M. rileyi strain UFMS 03 proved to be efficient, with emphasis on the concentration 1.0×108 conidia mL-1 showing 98% efficiency, in less lethal time (14.11 days). These results show the strain UFMS 03 of M. rileyi as a control agent for S. cosmioides.