Department of Entomology, Plant Pathology, and Nematology, University of Idaho, Moscow, ID.
USDA-ARS, Temperate Tree Fruit and Vegetable Research Unit, Wapato, WA.
J Econ Entomol. 2020 Dec 9;113(6):2595-2603. doi: 10.1093/jee/toaa210.
The potato psyllid, Bactericera cockerelli (Šulc), is a major pest of potato (Solanum tuberosum L.; Solanales: Solanaceae) as a vector of 'Candidatus Liberibacter solanacearum', the pathogen that causes zebra chip. Management of zebra chip is challenging in part because the noncrop sources of Liberibacter-infected psyllids arriving in potato remain unknown. Adding to this challenge is the occurrence of distinct genetic haplotypes of both potato psyllid and Liberibacter that differ in host range. Longleaf groundcherry (Physalis longifolia Nutt.) has been substantially overlooked in prior research as a potential noncrop source of Liberibacter-infected B. cockerelli colonizing fields of potato. The objective of this study was to assess the suitability of P. longifolia to the three common haplotypes of B. cockerelli (central, western, and northwestern haplotypes), and to two haplotypes of 'Ca. L. solanacearum' (Liberibacter A and B haplotypes). Greenhouse bioassays indicated that B. cockerelli of all three haplotypes produced more offspring on P. longifolia than on potato and preferred P. longifolia over potato during settling and egg-laying activities. Greenhouse and field trials showed that P. longifolia was also highly susceptible to Liberibacter. Additionally, we discovered that infected rhizomes survived winter and produced infected plants in late spring that could then be available for psyllid colonization and pathogen acquisition. Results show that P. longifolia is susceptible to both B. cockerelli and 'Ca. L. solanacearum' and must be considered as a potentially important source of infective B. cockerelli colonizing potato fields in the western United States.
马铃薯木虱，Bactericera cockerelli（Šulc），是马铃薯（Solanum tuberosum L.；Solanales：Solanaceae）的主要害虫，作为携带“马铃薯金黄隐性杆状病毒”的媒介，该病原体导致斑马纹病。斑马纹病的管理具有挑战性，部分原因是尚未确定到达马铃薯田的非作物源携带游离杆菌的木虱来源。增加这一挑战的是马铃薯木虱和游离杆菌的不同遗传单倍型的发生，它们在宿主范围上有所不同。在先前的研究中，长叶酸浆（Physalis longifolia Nutt.）作为一种潜在的非作物源，被严重忽视了，因为它是自由杆菌感染的木虱在马铃薯田中定植的来源。本研究的目的是评估 P. longifolia 对 B. cockerelli 的三种常见单倍型（中、西和西北单倍型）以及两种“Ca. L. solanacearum”单倍型（游离杆菌 A 和 B 单倍型）的适宜性。温室生物测定表明，所有三种单倍型的 B. cockerelli 在 P. longifolia 上产生的后代比在马铃薯上多，并且在定居和产卵活动中更喜欢 P. longifolia 而不是马铃薯。温室和田间试验表明，P. longifolia 也极易受到游离杆菌的感染。此外，我们发现受感染的根茎在冬季存活下来，并在春末产生受感染的植物，然后可供木虱定植和病原体获得。结果表明，P. longifolia 对 B. cockerelli 和“Ca. L. solanacearum”均敏感，必须被视为美国西部可能重要的感染性 B. cockerelli 定植马铃薯田的潜在来源。
