Effect of imidacloprid concentration on tomato seed germination (Solanum lycopersicum)

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DOI:

https://doi.org/10.25127/agrops.20251.1150

Keywords:

neonicotinoids, germination, imidacloprid, mortality, radicle

Abstract

Tomatoes (Solanum lycopersicum) are a high-value crop in Peru; however, early exposure to pesticides such as neonicotinoids can compromise their germination. The objective of the study was to evaluate the effect of imidacloprid on the germination and initial growth of tomato seeds using a bioassay with four concentrations (0.025, 0.05, 0.10, and 0.75 g/L) and a control. The relative germination percentage (RGP), relative radicle growth (RRG), and germination index (GI) were quantified, and Probit analysis was applied to estimate the median lethal concentration (LC50). The results showed a progressive and dose-dependent phytotoxic effect. Higher concentrations significantly reduced root length (to an average value of 1.0 mm) and the number of germinated seeds, resulting in decreased RGR and RGR values. The GI presented the best fit for the Probit model (R² = 0.9962; EAM = 0.031; ECM = 0.0014), so it was selected for toxicity estimation. Based on this model, an LC50 of 0.0287 g/L was determined, confirming that even low concentrations of imidacloprid cause significant inhibition of early development. It is concluded that imidacloprid negatively affects tomato germination and root growth, suggesting that its use should be handled with caution in the early stages of cultivation. Future research should evaluate sublethal effects in later stages of development and explore less toxic alternatives for pest management.

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Published

2025-12-10

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How to Cite

Effect of imidacloprid concentration on tomato seed germination (Solanum lycopersicum). (2025). Revista De Investigación De Agroproducción Sustentable, 7(1), 106-115. https://doi.org/10.25127/agrops.20251.1150

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