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This study quantifies damage from Orthezia praelonga and Leucoptera coffeella on coffee plants. Photosynthesis levels accurately indicate pest infestation damage, establishing new damage assessment benchmarks.

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Area of Science:

  • Agricultural Entomology
  • Plant Physiology
  • Pest Management

Background:

  • Orthezia praelonga and Leucoptera coffeella are significant pests affecting coffee crops.
  • Accurate assessment of pest-induced damage is crucial for effective crop management.
  • Existing damage evaluation methods may not fully capture physiological impacts.

Purpose of the Study:

  • To determine damage levels caused by Orthezia praelonga on rangpur lime.
  • To determine damage levels caused by Leucoptera coffeella on Obatã coffee.
  • To establish a new concept for evaluating plant physiological parameters related to pest damage.

Main Methods:

  • Evaluation of plant physiological parameters: photosynthesis, stomatal conductance, leaf temperature, transpiration, and internal CO2 concentration.
  • Utilized an infrared gas analyzer for precise measurements.
  • Established a negative correlation between pest infestation levels and photosynthetic rates.

Main Results:

  • A negative correlation was observed between infestation level and photosynthesis.
  • The negative inflexion point of the photosynthesis curve serves as a reference for damage levels.
  • Established control levels: O. praelonga below 7-13% damaged leaf area; L. coffeella below 26-36% damaged leaf area.

Conclusions:

  • Photosynthesis is the most reliable physiological parameter for assessing pest damage in coffee plants.
  • The study provides quantitative benchmarks for damage assessment for O. praelonga and L. coffeella.
  • This new concept offers a more precise method for evaluating pest impact on coffee physiology.