( This ( ( can ( be ( dangerous ( to ( both ( ( plants and ) animals ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT This)) (VP (MD can) (VP (VB be) (ADJP (JJ dangerous) (PP (TO to) (NP (DT both) (NNS plants) (CC and) (NNS animals)))))) (. .)))
This can be dangerous to both plants and animals.
(ROOT (S (NP (NNS Nematodes)) (VP (MD can) (VP (VB be) (NP (NP (DT a) (NN parasite)) (PP (IN of) (NP (DT both)))))) (. .)))
Nematodes can be a parasite of both.