pruning hook

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A long pole with a curved saw blade and usually a clipping mechanism on one end, used especially for pruning small trees.

from The Century Dictionary.

• noun A knife with a hooked blade, used for pruning trees, vines, etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun billhook

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a long-handled pruning saw with a curved blade at the end and sometimes a clipper; used to prune small trees