Department of Entomology, Plant Pathology and Nematology, University of Idaho, Aberdeen R&E Center, Aberdeen 83210.
Department of Plant Sciences, University of Idaho, Kimberly R&E Center, Kimberly 83341.
Plant Dis. 2018 Mar;102(3):561-568. doi: 10.1094/PDIS-05-17-0619-RE. Epub 2018 Jan 9.
Zebra chip (ZC) disease of potato is associated with the putative pathogen 'Candidatus Liberibacter solanacearum', which is transmitted by the potato psyllid Bactericera cockerelli (Hem., Triozidae). The present study was initiated to investigate 'Ca. L. solanacearum' development during and following typical commercial storage practices. Using bacteriliferous psyllids, Russet Norkotah potato tubers were infested in field cages 14, 10, and 4 days before harvest. Changes in 'Ca. L. solanacearum' detection rate, 'Ca. L. solanacearum' titer, and concentrations of phenolic compounds were documented throughout storage. 'Ca. L. solanacearum' titer continued to increase during storage. Although significant increases in the frequency of 'Ca. L. solanacearum' detection were observed in all infestation treatments, the impact of 'Ca. L. solanacearum' infection on tuber quality remained comparatively low in plants infected 4 days before harvest, because the majority of the tubers remained asymptomatic. Minimizing storage and retail chain movement durations would help to limit 'Ca. L. solanacearum' impact on tuber quality in tubers infected 14 and 10 days before harvest. This study also demonstrated that 'Ca. L. solanacearum' can relocate from a newly infected leaf to a tuber in as little as 4 days. Psyllid management is recommended until at least 4 days before green harvest, when psyllid pressure is high in fields in which tubers are destined for commercial storage.
马铃薯斑马纹病与假定病原体“韧皮部杆菌属马铃薯丛枝菌”有关，该病原体通过马铃薯叶蝉 Bactericera cockerelli（半翅目，瘿蚊科）传播。本研究旨在调查“Ca. L. solanacearum”在典型商业储存期间和之后的发展情况。使用带菌的叶蝉，在收获前 14、10 和 4 天将 Russet Norkotah 马铃薯块茎侵扰到田间笼中。在整个储存期间记录了“Ca. L. solanacearum”检出率、“Ca. L. solanacearum”滴度和酚类化合物浓度的变化。“Ca. L. solanacearum”滴度在储存过程中持续增加。尽管在所有侵染处理中均观察到“Ca. L. solanacearum”检测频率显著增加，但在收获前 4 天感染的植物中，“Ca. L. solanacearum”感染对块茎质量的影响仍然相对较低，因为大多数块茎仍无症状。尽量减少储存和零售链的移动时间将有助于限制“Ca. L. solanacearum”在收获前 14 和 10 天感染的块茎对块茎质量的影响。本研究还表明，“Ca. L. solanacearum”可以在短短 4 天内从新感染的叶片重新定位到块茎。建议在绿收前至少 4 天进行叶蝉管理，此时即将进行商业储存的田间叶蝉压力较高。
