Citrus greening or Huanglongbing (HLB) is a devastating disease of citrus worldwide (Gottwald et al., 2007). HLB is particularly devastating because of its severe yield reduction in citrus trees followed by tree decline, the absence of resistant citrus varieties, and the limited control measures to prevent disease progression and pathogen spread by the vector, Asian citrus psyllid (ACP, Diaphorina citri). At its current rate of spread and impact on the economics of citrus production, HLB could destroy the US citrus industry in our lifetimes. With current management technology, early detection is critical to the rapid response needed to slow the spread of the disease.
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