( ( Huanglongbing ( -LRB- ( HLB -RRB- ) ) ) ( ( is ( caused ( by ( ( a ( phloem-limited bacterium ) ) ( that ( has ( a ( true ( cell wall ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NN Huanglongbing)) (PRN (-LRB- -LRB-) (NP (NNP HLB)) (-RRB- -RRB-))) (VP (VBZ is) (VP (VBN caused) (PP (IN by) (NP (NP (DT a) (JJ phloem-limited) (NN bacterium)) (SBAR (WHNP (WDT that)) (S (VP (VBZ has) (NP (DT a) (JJ true) (NN cell) (NN wall))))))))) (. .)))
Huanglongbing (HLB) is caused by a  phloem-limited bacterium that has a true cell wall.
(ROOT (S (NP (DT A) (NN lysozyme)) (VP (VBZ destroys) (NP (NNS bacteria)) (PP (IN by) (S (VP (VBG digesting) (NP (PRP$ their) (NN cell) (NNS walls)))))) (. .)))