Related Experiment Video
Updated: Mar 22, 2026
Evaluation of Zika Virus-specific T-cell Responses in Immunoprivileged Organs of Infected Ifnar1-/- Mice
Published on: October 17, 2018
Variations in Zebra Chip Disease Expression and Tuber Biochemistry in Response to Vector Density
Arash Rashed1, Christopher M Wallis1, Fekede Workneh1
1First author: University of Idaho, Department of Plant, Soil, and Entomological Sciences, Aberdeen Research & Extension Center, Aberdeen 83210; second author: United States Department of Agriculture-Agricultural Research Service, San Joaquin Valley Agricultural Sciences Center, Crop Diseases, Pests and Genetics Research Unit, 9611 S. Riverbend Ave, Parlier, CA 93648; and third, fourth, and fifth authors: Texas A&M Agrilife Research and Extension, 6500 Amarillo Blvd W., Amarillo 79106.
Increasing potato psyllid numbers amplify Zebra chip disease severity by raising pathogen levels and altering tuber biochemistry. Managing psyllid populations is key to reducing crop losses.
Area of Science:
- Plant Pathology
- Entomology
- Agricultural Science
Background:
- Zebra chip (ZC) disease, caused by 'Candidatus Liberibacter solanacearum' (Ca. L. solanacearum), is a significant threat to potato production.
- The disease is transmitted by the potato psyllid, leading to substantial economic losses in the United States over the past decade.
Purpose of the Study:
- To investigate the impact of varying potato psyllid vector densities on Ca. L. solanacearum titer.
- To assess how vector density influences biochemical profiles (amino acids, carbohydrates, phenolics) in potato tubers.
- To correlate these factors with the severity of ZC symptoms in different potato cultivars.
Main Methods:
- Field experiments were conducted using 'Red La Soda' and 'Russet Norkotah' potato cultivars.
- Inoculation with Ca. L. solanacearum was performed using three distinct densities of bacteriliferous potato psyllids (5, 10, and 30 per plant).
- Bacterial titer, biochemical composition, and symptom severity in tubers were quantified and analyzed.
Main Results:
- Higher psyllid densities led to increased Ca. L. solanacearum titer and greater symptom severity in both potato cultivars.
- Responses of amino acids and reducing sugars to vector density were cultivar-specific.
- Phenolic compounds generally increased post-infection, correlating positively with infective psyllid numbers.
Conclusions:
- The number of infective potato psyllids directly impacts pathogen load and biochemical changes in tubers, influencing ZC symptom severity.
- While managing vector populations is crucial for immediate control, developing potato genotypes with enhanced resistance, particularly targeting phenolic pathways, offers a sustainable long-term strategy.
- Integrated management combining chemical control with resistant cultivars could improve ZC disease management.
