Also, lack of winter freezes means that mites normally killed off by the cold will survive.
( Also ( , ( ( lack ( of ( winter freezes ) ) ) ( ( means ( that ( ( mites ( normally ( ( killed off ) ( by ( the cold ) ) ) ) ) ( will survive ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Also)) (, ,) (NP (NP (NN lack)) (PP (IN of) (NP (NN winter) (NNS freezes)))) (VP (VBZ means) (SBAR (IN that) (S (NP (NP (NNS mites)) (VP (ADVP (RB normally)) (VBN killed) (PRT (RP off)) (PP (IN by) (NP (DT the) (NN cold))))) (VP (MD will) (VP (VB survive)))))) (. .)))
When there is not a freeze during winter the mites are able to survive.
( ( When ( there ( ( ( is not ) ( a freeze ) ) ( during winter ) ) ) ) ( ( the mites ) ( ( are ( able ( to survive ) ) ) . ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (EX there)) (VP (VBZ is) (RB not) (NP (DT a) (NN freeze)) (PP (IN during) (NP (NN winter)))))) (NP (DT the) (NNS mites)) (VP (VBP are) (ADJP (JJ able) (S (VP (TO to) (VP (VB survive)))))) (. .)))