Wosula E N, Davis J A, Clark C A, Smith T P, Arancibia R A, Musser F R, Reed J T
Department of Plant Pathology and Crop Physiology.
Department of Entomology.
Plant Dis. 2013 Jan;97(1):53-61. doi: 10.1094/PDIS-06-12-0564-RE.
Sweet potato feathery mottle virus (SPFMV), Sweet potato virus G (SPVG), and Sweet potato virus 2 (SPV2) are sweetpotato (Ipomoea batatas) potyviruses nonpersistently transmitted by aphids. Our objective was to determine how aphid abundance, aphid species diversity, and virus titers relate to the spread of SPFMV, SPVG, and SPV2 in Louisiana and Mississippi sweetpotato fields. The most abundant aphid species were Aphis gossypii, Myzus persicae, Rhopalosiphum padi, and Therioaphis trifolii. Aphids were captured during the entire crop cycle but virus infection of sentinel plants occurred mainly during the months of June to August. SPFMV was more commonly detected than SPVG or SPV2 in sentinel plants. Virus titers for SPFMV were higher in samples beginning in late June. Because significant aphid populations were present during April to June when virus titers were low in sweetpotato and there was very little virus infection of sentinel plants, low virus titers may have limited aphid acquisition and transmission opportunities. This is the first study to comprehensively examine aphid transmission of potyviruses in sweetpotato crops in the United States and includes the first report of R. maidis and R. padi as vectors of SPFMV, though they were less efficient than A. gossypii or M. persicae.
甘薯羽状斑驳病毒（SPFMV）、甘薯G病毒（SPVG）和甘薯病毒2（SPV2）是由蚜虫非持久性传播的甘薯（Ipomoea batatas）马铃薯Y病毒属病毒。我们的目标是确定蚜虫数量、蚜虫物种多样性和病毒滴度如何与SPFMV、SPVG和SPV2在路易斯安那州和密西西比州甘薯田中的传播相关。最常见的蚜虫种类是棉蚜、桃蚜、禾谷缢管蚜和三叶草斑蚜。在整个作物生长周期内都捕获到了蚜虫，但标记植株的病毒感染主要发生在6月至8月。在标记植株中，SPFMV比SPVG或SPV2更常被检测到。从6月下旬开始的样本中，SPFMV的病毒滴度更高。由于在4月至6月期间甘薯病毒滴度较低且标记植株的病毒感染很少时存在大量蚜虫，低病毒滴度可能限制了蚜虫获取和传播病毒的机会。这是美国首次全面研究马铃薯Y病毒属病毒在甘薯作物中的蚜虫传播情况，并且首次报道玉米缢管蚜和禾谷缢管蚜是SPFMV的传播媒介，尽管它们的传播效率低于棉蚜或桃蚜。
