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The root of problem

机译：问题的根源

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Researchers find new focus to attack citrus greening. Scientists studying huanglongbing—or HLB—have made an unexpected discovery.Even though the disease is introduced into citrus trees through a vector—the Asian citrus psyllid— the infection causes root damage even before aboveground symptoms are seen, says Jim Graham, soil microbiologist at the University of Florida's Citrus Research and Education Center in Lake Alfred.The finding has caused researchers and growers to hone their plan of attack against citrus greening."Now that we know this, we focus squarely on root health," he says.By the time symptoms are showing, the tree shows a minimum of 30 percent root loss and 30 percent fruit loss, Graham says.As if root damage caused by HLB weren’t enough, Florida growers still must contend with other prevalent root health issues—Phytophthora, parasitic nematodes and Diaprepes root weevil.In the past, these pests and pathogens were growers' main concerns, but now they pile on additional root damage, after HLB.
机译：研究人员发现了新的重点来打击柑橘绿化。研究黄龙病（HLB）的科学家已经出乎意料的发现。即使这种疾病通过媒介-亚洲柑橘木虱被引入到柑橘树中，这种感染甚至在看到地上症状之前都会对根系造成损害，”土壤微生物学家吉姆•格雷厄姆（Jim Graham）说。这项发现已导致研究人员和种植者磨练了针对柑橘绿化的攻击计划。“现在我们知道了，我们将重点放在根部健康上，”他说。格雷厄姆说，在出现症状时，树木至少损失了30％的根，水果损失了30％。好像HLB造成的根损害还不够，佛罗里达州的种植者仍然必须应对其他普遍的根部健康问题-疫霉菌，过去，这些害虫和病原体是种植者的主要关注点，但现在，在HLB之后，它们会进一步危害根系。

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