Easiest way to fight these buggers is to trap 'em in the trees. Just west of the burned-out house, there's a tiny passageway through the trees. The mantraps spawn just west of there.
Walk through that passage until you see them, then run back through the passage to the roadway. They'll try to follow you, but won't be able to make it through the trees. Now lambast them with spells, especially Fire spells (they're plants, after all!) After that, you should be able to travel to the castle with impunity.
-Sazerac
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