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Smartphone Applications

Detection and Diagnosis of Citrus Leaf Symptoms

PROJECT TITLE: Artificial intelligence apps for smartphones: a modern diagnostic extension tool for citrus growers and home owners to rapidly identify nutrient deficiencies and HLB symptoms in Florida groves
  1. Develop fast and accurate diagnostic artificial intelligence models for key nutrient deficiencies of citrus encountered when trees are impacted by HLB disease
  2. Transfer the best detection models developed to smartphone platforms (iOS and Android) and develop apps to use the models for a) identifying the above disorders in-field and b) to provide recommendations for their management with enhanced nutrition
  3. Demonstrate and distribute the prototype smartphone app to citrus extension agents and citrus growers, and provide initial support by creating extension and outreach materials on UF/IFAS EDIS libraries and by offering a workshop for using the new smartphone app.
Leaf symptoms already trained for detection by the deep learning artificial neural networks (see demo video below):

Deficiencies: iron, manganese, zinc, magnesium

Pests: spider mites

Diseases: HLB, citrus canker, greasy spot

Additional leaf symptoms to be trained:

Deficiencies: potassium, nitrogen

Pests: rust mites, thrips, Asian citrus psyllids

Diseases: citrus scab, Phytophthora, citrus black spot

Funding: This project was made possible by funding from the HLB Multi-Agency Coordination (MAC) System

Arnold Schumann - professor (

Chris Oswalt - extension agent IV

Laura Waldo - biological scientist III

Perseveranca Mungofa - graduate student


Detection and diagnosis of citrus leaf pests, diseases and nutrient deficiencies
(click on the image for a video demonstration of a working prototype)

Last Updated: July 10, 2019