Question

Citrus greening disease (Huanglongbing), transmitted by the Asian citrus psyllid and causing yellow shoots, blotchy mottled leaves and lopsided, bitter fruits, is considered one of the most destructive diseases of citrus worldwide. It is caused by which type of pathogen?

A Virus
B Phloem-limited bacterium
C Viroid
D Fungus
E Nematode
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