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Communication Dans Un Congrès Année : 2022

Sustainable laser-based technology for insect pest control

Résumé

Agriculture needs sustainable alternatives to pesticides due to public health issue [Fantke and Jolliet, 2016; Kim et al., 2017]. Several alternatives have been explored but none really emerged. Few pioneer studies already proved efficiency of lasers in elimination of mosquitoes or drosophilids [Dáder et al., 2014; Keller et al., 2016]. However, laser irradiation has never been applied to agricultural pests. To fully explore the applicability of this method, we must both choose a representative pest species and investigate the optimization of the method to be energy efficient and innocuous for the plant environment. Based on three aphid lines (Acyrthosiphon pisum LL01, YR2 and Rhopalosiphum padi) and wavelengths (532, 1070 and 10600nm), we first determined the lethal doses able to provoke 90% of death rate (LD90) at Day+1 and Day+7. By using synchronized 1st instar (N1) of the A. pisum LL01 line, we also assessed the influence of laser irradiation on the insect organism in order to make the solution to be as less energy consuming as possible. Finally, a study was performed to ensure that fluences used to treat aphids are innocuous for the host plants. Both visible and far infrared wavelengths are effective in aphid elimination whereas the near infrared wavelength is ineffective. LD90 values at Day+7 applied on N1 A. pisum LL01 populations are ten times smaller than LD90 values for adults at Day+1 (1.15 J.cm-2 and 12.91 J.cm-2 respectively) with the far infrared wavelength. Laser impacts substantially irradiated populations affecting their mass, fecundity, development and mortality. Our results also suggest that irradiating at early stage is crucial to be effective. As a global strategy, we show that the energy cost will mostly depend on the chosen mobility vector and not on the electrical supply of the laser. LD90 irradiation conditions are harmless for host plants growth. This work suggests that a laser-based strategy is feasible and in-depth studies remain to be done in order to bring this solution to the market.
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Dates et versions

hal-03543644 , version 1 (26-01-2022)

Identifiants

  • HAL Id : hal-03543644 , version 1

Citer

R. Gaetani, V. Lacotte, Vincent Dufour, Clavel A., - Duport, G., et al.. Sustainable laser-based technology for insect pest control. ICESB 2021, Jan 2022, Osaka (visio), Japan. ⟨hal-03543644⟩
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