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首页> 外文期刊>Plant Disease >Population Dynamics of Released Potato Psyllids and their Bacteriliferous Status in Relation to Zebra Chip Incidence in Caged Field Plots
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Population Dynamics of Released Potato Psyllids and their Bacteriliferous Status in Relation to Zebra Chip Incidence in Caged Field Plots

机译：笼养田中释放马铃薯木虱的种群动态及其细菌状态与斑马线发生率的关系

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Potato psyllids vector 'Candidatus Liberibacter solanacearum' (Lso), the putative causal agent of potato zebra chip (ZC). Currently, sticky traps are the primary psyllid monitoring tools used by growers for making management decisions. However, the reliability of sticky traps in predicting psyllid numbers in potato fields has always been questioned. In 2013 and 2014, experiments were conducted in covered field plots at the Texas A&M AgriLife Research Station at Bushland to investigate the relationships among initial psyllid numbers, psyllids captured on sticky traps and their Lso status, and zebra chip incidence. Three densities of Lso-positive psyllids (5, 15, or 30/cage) were released under 2-week-old potato canopies with four replications in plot sizes of 7.6 to 9 m by 5 rows. Psyllids were released under the first plant in the center row and monitored weekly with a yellow sticky trap from the opposite end. Number of plants with zebra chip symptoms also was counted weekly beginning one month after infestation with psyllids. The total number of psyllids captured on sticky traps and disease incidence levels generally corresponded to the levels of psyllid density treatments (5 < 15 < 30), but the differences became more apparent toward the end of the experiments. Psyllid numbers in the different density treatments fluctuated more or less in synchrony over time, which appeared to reflect periodic emergence of new generations of psyllids. Initially, all captured psyllids tested positive for Lso. However, the proportions of psyllids testing positive declined dramatically after a few weeks, which suggested that the new generations of psyllids were devoid of Lso. Over all, less than 50% of captured psyllids tested positive for the pathogen. The decline in proportions of psyllids testing positive for Lso following successive generations has significant relevance to field situations and may partly explain why there are generally low percentages of Lso-positive psyllids under field conditions.
机译：马铃薯木虱载体'Candidatus Liberibacter solanacearum'（Lso），马铃薯斑马片（ZC）的推定病因。当前，粘性陷阱是种植者用于做出管理决策的主要木虱监测工具。然而，一直有人质疑粘性陷阱在预测马铃薯田中木虱数量上的可靠性。 2013年和2014年，在位于Bushland的Texas A＆M AgriLife研究站的有盖田地中进行了实验，以研究初始木桩数量，在粘性阱上捕获的木桩及其Lso状态与斑马片发生率之间的关系。在2周龄的马铃薯冠棚下，释放出3个密度的Lso阳性木虱（5、15或30个/笼），并在7.6至9 m的5行样地中进行四次复制。木虱在中间排的第一株植物下被释放，并从相反的一端每周用黄色的粘性陷阱监测。自木虱侵染后一个月开始，每周还计数具有斑马片症状的植物的数量。在粘性阱上捕获的木虱总数和疾病发生水平通常与木虱密度治疗水平相对应（5 <15 <30），但是在实验结束时，差异变得更加明显。随着时间的推移，不同密度处理下的木虱数量或多或少地同步波动，这似乎反映了新一代木虱的周期性出现。最初，所有捕获的木虱均检测出Lso阳性。然而，几周后测试的木虱的比例急剧下降，这表明新一代的木虱没有Lso。总体而言，不到50％的捕获木虱对病原体呈阳性。连续世代后，Lso检测为阳性的木虱的比例下降与田间情况有很大关系，并且可以部分解释为什么在田间条件下Lso阳性木虱的百分比通常较低。

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