A5043651836- Insect Resistance and Genetics
- Insect and Pesticide Research
- Entomopathogenic Microorganisms in Pest Control
- Insect-Plant Interactions and Control
- Insect Pest Control Strategies
- Genetically Modified Organisms Research
Universidade de São Paulo
2018-2024
Understanding the genetic basis of insect resistance to insecticides can help implement insecticide management (IRM) strategies. In this study, we selected a strain Spodoptera frugiperda (J. E. Smith) (Lepidoptera: Noctuidae) resistant chlorantraniliprole using F2 screen method, characterized inheritance and evaluated patterns cross-resistance other diamide insecticides.The chlorantraniliprole-resistant (Chlorant-R) was from field-collected population with an estimated allele frequency...
The use of spinosyn insecticides is one the major control strategies fall armyworm, Spodoptera frugiperda (J. E. Smith) in Brazil. In this study, we selected a spinetoram-resistant strain from field-population S. to characterize inheritance resistance and cross-resistance relationship between insecticides.The values LC50 (95% CI) obtained concentration-response bioassays were 0.63 (0.55-0.73) μg spinetoram mL-1 for susceptible (SUS), 1170.96 (1041.61-1323.89) resistant (SPT-R). These...
Abstract BACKGROUND Fall armyworm, Spodoptera frugiperda (J. E. Smith), is a relevant global pest due to severe damage caused on agricultural crops and its capacity evolve resistance insecticides. Here, we selected strain of S. resistant emamectin benzoate under laboratory conditions understand the inheritance patterns, cross‐resistance synergism involved in resistance. RESULTS The benzoate‐resistant (Ben‐R) was isolated by using F 2 screen field population collected Lucas do Rio Verde, Mato...
Spodoptera frugiperda (J. E. Smith) is a widespread agricultural pest with several records of resistance to different insecticides and Bt proteins, including the neurotoxic chlorpyrifos (organophosphate) lambda-cyhalothrin (pyrethroid). Here, we (i) characterized monitored susceptibility field populations S. (194 populations) (197 collected from major maize-growing regions Brazil 2003 2016, (ii) compared gene expression levels laboratory-selected, chlorpyrifos- lambda-cyhalothrin-resistant...
The use of Bt plants has been the main strategy for controlling fall armyworm Spodoptera frugiperda (J. E. Smith) in Brazil. However, many resistance cases were already registered. S. to Vip3Aa20 protein was recently characterized under laboratory conditions but it is still efficient field conditions. Here, monitoring studies conducted using phenotypic (purified and maize leaves) genotypic (F1 F2 screen) methods support insect management (IRM) programs preserve technology on maize.Phenotypic...
Abstract BACKGROUND Spodoptera frugiperda (J.E. Smith) is a difficult pest to manage mainly because of its resistance insecticides and Bt proteins. We evaluated fitness costs S. resistant strains diamide with different genetic backgrounds aiming highlight the importance using isogenic strains. established near‐isogenic strain diamides (Iso‐RR), chlorantraniliprole (RR) selected from field‐collected population susceptible reference (SS). Fitness were assayed close‐related (Iso‐RR SS)...
Spodoptera frugiperda (J.E. Smith) is one of the key cross-crop pests in Brazilian agroecosystems. Field-evolved resistance S. to some conventional insecticides and Bt proteins has already been reported. Thus, use with new mode action such as sodium channel blockers (indoxacarb metaflumizone) could be an important tool insecticide management (IRM) programs. To implement a proactive IRM, we conducted baseline response monitoring indoxacarb metaflumizone 87 field populations collected from...
Susceptibility monitoring to insecticides is a key component implementing insecticide resistance management (IRM) programs. In this research, the susceptibility teflubenzuron in Spodoptera frugiperda (J.E Smith) was monitored more than 200 field-collected populations from major corn-growing regions of Brazil, 2004 2020. Initially, we defined diagnostic concentration 10 µg mL-1 using diet-overlay bioassay for susceptibility. A variation S. detected among different locations. We also...
Abstract Fitness costs associated with insect resistance to insecticides can be exploited implement management programs. However, most of these studies are restricted evaluating biological traits on artificial diets. Here, we investigated the fitness cost chlorantraniliprole in Spodoptera frugiperda (J.E. Smith) feeding corn, soybean, and cotton plants. We used a near-isogenic strain S. resistant (Iso-RR), susceptible (SS), heterozygotes strains (H1 H2) evaluate several population growth...
Mite identification is usually done by the examination of morphological characteristics, variation which not always sufficiently known to allow reliable distinction between closely related species. Morphological variations can be associated with geographical distribution and/ or host ranges. The objective this study evaluate a population predatory mite identified as Euseius concordis (Chant) (Phytoseiidae) collected in Piracicaba, southeastern Brazil, when reared at different combinations...
Abstract Spodoptera frugiperda (J. E. Smith) is a serious and widespread agricultural pest with several records of resistance to different insecticides Bt proteins, including the neurotoxic chlorpyrifos (organophosphate) lambda-cyhalothrin (pyrethroid). In this study, we (i) characterized monitored susceptibility field populations S. (194 populations) (197 collected from major maize-growing regions Brazil 2003 2016, (ii) compared gene expression levels chlorpyrifos-...
Abstract Insecticide resistance is usually associated with fitness costs. The magnitude of costs affected by environmental and ecological factors. Here, we explored how host plants could affect insecticide resistance. Initially, spinetoram-resistant (RR) susceptible (SS) strains Spodoptera frugiperda were selected using F 2 screen from a population collected in São Desidério, Bahia State, Brazil 2018. Besides de RR SS strains, also assessed for heterozygous strain (RS). Life-history traits...