Bacillus thuringiensis-Based Bioproduct: Characterization and Performance Against Spodoptera frugiperda Strains in Maize Under Different Environmental Temperatures

• Published in: Neotropical entomology Vol. 52; no. 2; pp. 283 - 291
• Main Authors: Carrizo, Alfonso Emanuel, del Valle Loto, Flavia, Baigorí, Mario Domingo, Pera, Licia María
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.04.2023
• Subjects: Agriculture; Animals; Bacillus thuringiensis - genetics; Bacterial Proteins - genetics; Biological Control in Latin America; Biomedical and Life Sciences; Endotoxins; Entomology; Hemolysin Proteins - genetics; Insecticide Resistance; Larva; Life Sciences; Oryza; Plants, Genetically Modified; Spodoptera - genetics; Temperature; Zea mays - genetics; Submerged fermentation; Environmental temperature; strains; Bioproduct efficacy; Spodoptera frugiperda strains; Zea mays; Bacillus thuringiensis
• ISSN: 1519-566X; 1678-8052; 1678-8052
• DOI: 10.1007/s13744-022-00973-8

Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae) is an important pest in several regions being the use of Bacillus thuringiensis -based bioproducts an alternative for its control. Firstly, 3 L of an aqueous bioproduct suspension was produced and characterized. Its 50% lethal concentration against molecularly identified corn and rice S. frugiperda strains using an artificial diet were 77.01% (95% CL, 68.16–90.47) and 2.22% (95% CL, 0.01–6.68), respectively. The next objective of this work was to evaluate the performance of this bioproduct in maize against S. frugiperda strains under different simulated agrological regions mimicking their corresponding periodic day/night temperatures. Thus, the impact of environmental temperature on the bioproduct efficacy ( E ) was studied. It was observed that a warmer scenario (35 °C day/30 °C night) could favor the tolerance of corn S. frugiperda strain to the bioproduct ( E  = 56.36 ± 0.61%) maintaining a high efficacy (92.44 ± 6.55%) when it was tested against rice S. frugiperda strain. Conversely, under temperate conditions, efficacy values ranged from 84 to 95% for both S. frugiperda strains. On the other hand, based on a foliar feeding damage analysis, our bioproduct displayed a significant foliar protection in maize plant s infested with either corn or rice S. frugiperda strains. Graphical abstract