( ( Spores ( of ( the pathogen ) ) ) ( ( are ( spread ( by ( ( direct contact ) ( of leaves ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Spores)) (PP (IN of) (NP (DT the) (NN pathogen)))) (VP (VBP are) (VP (VBN spread) (PP (IN by) (NP (NP (JJ direct) (NN contact)) (PP (IN of) (NP (NNS leaves))))))) (. .)))
Spores of the pathogen are spread by direct contact of leaves.
(ROOT (S (NP (NP (JJ Pathogens) (NN spread)) (PRN (-LRB- -LRB-) (PRP s) (-RRB- -RRB-))) (VP (VBZ stis) (PP (IN during) (NP (JJ sexual) (NN contact)))) (. .)))