Oct 10, 2018· Introduction. Citrus greening disease (Huanglongbing, HLB) is economically the most serious and fatal disease of citrus throughout the globe [1, 2, 3, 4].The disease was first reported in China in 1919 [1, 5] and has since spread all over the world.The causal agent of HLB is a fastidious, gram-negative bacterium, which exist in nature mainly in the form of three
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