- The causal organism is now known as Candidatus Liberibacter solanacearum (Ca. L. solanacearum).
- This is a phloem-limited bacterium like organism.
- The bacterium is transmitted to potatoes by the potato-tomato psyllid, Bactericera cockerelli.
- This psyllid generally occurs in warm conditions and has not yet been found in Europe.
- However, Ca. L. solanacearum infection of carrots in Europe had been associated with other species of psyllids.
- Symptoms in potato foliage include rolling of leaves but the main problem occurs in tubers, which show dark stripes.
- Tuber symptoms are particularly evident after frying and result in crop rejections for processing.
- In countries where zebra chip occurs, control is by use of uninfected seed and by control of the psyllids.
- A post-entry quarantine test was introduced for Ca L solanacearum in the UK in 2010.
Notes on zebra chip
Zebra chip disease 2012 (Biology, transmission and risk)