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Impact of sublethal doses of 2,4-D, simulating drift, on tomato yield.

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Tomato plants are highly sensitive to 2,4-D herbicide drift, especially during early growth stages. However, older tomato plants show increased tolerance to 2,4-D exposure, minimizing yield loss.

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Area of Science:

  • Agricultural Science
  • Agronomy
  • Plant Science

Background:

  • Tomato (Solanum lycopersicum) exhibits significant sensitivity to 2,4-D herbicide drift.
  • This sensitivity has resulted in restrictions on 2,4-D based products near tomato cultivation.
  • Understanding tomato's response to varying 2,4-D doses is crucial for agricultural practices.

Purpose of the Study:

  • To evaluate the impact of simulated 2,4-D herbicide drift on tomato crop yield and development.
  • To determine the critical growth stages of tomato concerning 2,4-D sensitivity.
  • To establish the relationship between 2,4-D application rates, plant age, and crop tolerance.

Main Methods:

  • Field experiments conducted over two consecutive years.
  • Application of sublethal 2,4-D doses (0.42–13.44 g a.i. ha⁻¹) at different tomato growth stages.
  • Simulation of herbicide drift scenarios based on common formulation rates.

Main Results:

  • A linear reduction in tomato crop yield occurred when 2,4-D was applied at the onset of flowering.
  • 2,4-D rates up to 13.44 g a.i. ha⁻¹ applied after the fourth truss stage showed no adverse effects on yield or development.
  • Tomato plants demonstrated a significant increase in 2,4-D tolerance as they aged.

Conclusions:

  • Tomato crop susceptibility to 2,4-D drift is strongly dependent on the plant's growth stage.
  • Older tomato plants possess a higher tolerance to 2,4-D, suggesting a potential window for herbicide application.
  • These findings can inform risk assessment and management strategies for 2,4-D use in areas adjacent to tomato fields.