Abstract
Neonicotinoid seed treatment (NST) is a routine practice used worldwide to control insect pests in a variety of crops, including maize (Zea mays mays L.). However, previous work indicates that systemic insecticides can compromise plant defenses, counteracting efforts to control insect pests. The goal of this study was to evaluate the effect of thiamethoxam-neonicotinoid seed treatment on the resistance of two maize genotypes (B73 and MC 4050) against the major non-target pest, fall armyworm Spodoptera frugiperda (Lepidoptera: Noctuidae). In preference and performance assays, we evaluated the effect of NST on fall armyworm behavior and biology. We also determined the influence of NST on induced plant defenses, quantifying phytohormone levels and plant volatile emissions, in treatments with and without fall armyworm herbivory. NST did not affect caterpillar host preference, however it reduced caterpillar performance on the genotype B73 across both maize growth stages (V4 and V6). NST-treated B73 plants also had lower induced volatile production (V4 stage) compared to untreated herbivore-damage plants and lower constitutive salicylic acid (V6 stage). In contrast, MC 4050 was not affected by the insecticide, regardless of growth stage. In conclusion, we found that the effects of NST on maize defenses vary by plant genotype and growth stage, suggesting growers may need to tailor their selection of plant genotypes to avoid negative impacts of NST on plant resistance and ultimately pest control.
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Acknowledgements
We thank Dr. Michael V. Kolomiets for providing maize seeds; Dr. Julio Bernal to allow us to use his laboratory space; and Dr. David Kerns and Jose Santiago for providing NST.
Funding
AFL has received research support by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (process number141499/2017–6) and CAPES-PrInt (process number 88887.371133/2019–00). MFGVP and GAC are supported by CNPq (grant 317453/2021–1 and grant 311701/2021–3, respectively), and Fundação de Amparo à Pesquisa do Estado de Minas Gerais (FAPEMIG).
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Lima, A.F., Aguirre, N.M., Carvalho, G.A. et al. Effects of neonicotinoid seed treatment on maize anti-herbivore defenses vary across plant genotypes. J Pest Sci 97, 199–212 (2024). https://doi.org/10.1007/s10340-023-01641-5
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DOI: https://doi.org/10.1007/s10340-023-01641-5