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Modelling the Transport and Biological Effect of Pesticide

Modelling the Transport and Biological Effect of Pesticide. Stephen J. Cox. Aims of crop spraying models. Saving money Improving biological control Reducing environmental contamination. Processes involved in spraying. Spray production. Formulation density, viscosity, surface tension

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Modelling the Transport and Biological Effect of Pesticide

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  1. Modelling the Transport and Biological Effect of Pesticide Stephen J. Cox

  2. Aims of crop spraying models • Saving money • Improving biological control • Reducing environmental contamination

  3. Processes involved in spraying

  4. Spray production • Formulation • density, viscosity, surface tension • Droplet size distribution • log normal - 2 parameters • Initial velocities • angles normally distributed from a hydraulic fan nozzle

  5. Transport equations • Ballistic • Random • Combined

  6. Trajectories of 10 droplets 100 mm 300 mm

  7. Model barley plants

  8. Capture • Interception • simple collision in space • ‘impaction efficiency’ correction for local airflow deviations • Rebound

  9. The deposit on individual plants

  10. Deposit pattern for 104 droplets (log scale)

  11. Possible improvement • Entrained air and tractor wake • Waving crop • Better rebound model • Speed of calculation

  12. Killing caterpillars • Distribution of pesticide on leaf • Markov chain model of insect behaviour dependent upon degree of poisoning • Simple pharmacokinetics

  13. Number still alive versus time

  14. Factors affecting proportion dead

  15. Simplest model of a leaf

  16. Concentration profile after1 Minute

  17. Concentration profile after6 Minutes

  18. Concentration profile after1 Hour

  19. Further work • More layers in model - perhaps include both sides of leaf • Comparison with experimental data • Integrate with a model of fungal growth to allow efficacy to be investigated

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